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Marine Engineering Reviewer
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Question Choice A Choice B Choice C Choice D Answer
1. Cylinder oil is used for _________. 2-stroke engine 4-stroke and 2 stroke engine
4-stroke engine gasoline engine A
2. An air compressor is equipped with an intercooler and an aftercooler to___________ .
prevent overheating of first stage valves
reduce the compressed air charge density
increase compressor efficiency
inject water vapor into the compressed air
C
3. What component of the freshwater evaporator on board use to boil seawater, using the main engine jacket cooling water?
Shell Evaporator Ejector Condenser B
4. One of the major components of centrifugal pump is___________.
gear screw impeller piston C
5. The high pressure cut-out switch will stop the refrigeration compressor when there is______.
accumulation of refrigerant in the crankcase oil
restricted suction filter
a stoppage of condenser cooling water flow
lack of refrigerant C
6. If the bowl of a disk type centrifugal purifier when operated as a separator is not primed, the______.
purifier will act as a clarifier at the discharge ring
oil solids will be deposited only at the intermediate top disk
oil will be lost through the water discharge ports
oil has a tendency to emulsify in the bowl
C
EENNGGIINNEE OOPPEERRAATTIIOONNAALL
CCOOMMPPEETTEENNCCEE ## 44
OOPPEERRAATTEE MMAAIINN AAUUXXIILLIIAARRYY MMAACCHHIINNEERRYY AANNDD AASSSSOOCCIIAATTEEDD
CCOONNTTRROOLL SSYYSSTTEEMMSS
1 CCOOMMPPEETTEENNCCEE ## 44 OOPPEERRAATTEE MMAAIINN AAUUXXIILLIIAARRYY MMAACCHHIINNEERRYY AANNDD AASSSSOOCCIIAATTEEDD CCOONNTTRROOLL SSYYSSTTEEMMSS
7. The storage tank for liquid refrigerant in a refrigeration system is called __________.
purging tank receiver dehumidifier charging tank B
8. Part of centrifugal disc purifier use to hold discs in place and directs the flow of dirty liquid to the bottom then to the discs as the oil flows upward is called ____________.
top disc bowl main cylinder distributor D
9. The high pressure side of the refrigeration systems starts from the _______.
compressor to the condenser
compressor to the expansion valve
evaporator to the compressor
expansion valve to the compressor
B
10. The dehydrator of a refrigeration system is located____________.
before expansion valve
after evaporator before liquid receiver
after oil separator A
11. A suitable location for the installation of an impulse type steam trap would be in the__________ -
steam supply line to a feedwater heater
drain line from a high point in the main steam line expansion loop
vacuum drag line from the atmospheric drain tank to the main condenser
horizontal run of drain line from the lowest point at the outlet of the heat exchanger
D
12. Which of the listed types of steam traps operates on the principle that hot water flashes to steam when its vapor pressure is reached?
Thermostatic Bimetallic Ball float Impulse D
13. A material use to protect the internal parts of air compressor from solid particles which can be sucked along with fresh air is called____.
Intake filter Air cleaner Unloader Paper cartridge A
2 CCOOMMPPEETTEENNCCEE ## 44 OOPPEERRAATTEE MMAAIINN AAUUXXIILLIIAARRYY MMAACCHHIINNEERRYY AANNDD AASSSSOOCCIIAATTEEDD CCOONNTTRROOLL SSYYSSTTEEMMSS
14. Air leaking into a flash type distilling plant could occur through_______.
gasketed joints, cooling tubes, and valve stem
gasketed joints, valve stem, and gage glass packing
gasketed joints, cooling tubes, and gage glass packing
salinometer, valve steam, and gage glass packing
B
15. Unloader in air compressor is use to________.
equalize first stage and second stage pressure
prevent excessive load on the motor during starting
drain water from cylinder
release excess oil from the compressor
B
16. Which of the listed operations will cause an automatically controlled refrigeration compressor to restart?
An increase in the suction pressure
Closing of the solenoid valve
Closing of the expansion valve
A decrease in the suction pressure
A
17. A high reading at a salinity cell located in the loop seal between two stages of a flash type evaporator indicates_____.
carryover in the first- stage
chill shocking is necessary to remove scale
leakage at the second- stage condenser
faulty operation of the brine overboard pump
A
18. Component of an engine used to increase scavenging air is called ___________.
scavenging flaps turbocharger engine blower scavenging valve B
19. The operation of a thermostatic steam trap depends upon the__________.
change in the amount of vapor produced within an enclosed chamber
action of a float within a chamber
difference in movement of two dissimilar bimetallic strips not fastened together
fact that hot water under pressure tends to flash into steam when its vapor pressure is rapidly reduced
A
20. The low pressure side of a refrigeration system is considered to exist from the ______.
expansion valve to the compressor
condenser to the expansion valve
expansion valve to the evaporator
evaporator to the condenser
A
3 CCOOMMPPEETTEENNCCEE ## 44 OOPPEERRAATTEE MMAAIINN AAUUXXIILLIIAARRYY MMAACCHHIINNEERRYY AANNDD AASSSSOOCCIIAATTEEDD CCOONNTTRROOLL SSYYSSTTEEMMSS
21. A protective device use to prevent over torque during starting of an Air Compressor is called_____.
reliever air release device solenoid unloader D
22. Condensers located in the various stages of the flash evaporator are cooled by_________.
seawater air distillate brine A
23. The separation chamber of the purifier is called ________.
pilot valve assembly
bowl heavy liquid chamber
light liquid chamber
B
24. Type of pump which is dependent of the head is______________.
reciprocating pump
piston pump screw pump centrifugal pump D
25. It refers to an internal combustion engine practice, where there is a necessity of heating the oil, to ensure easy flow and good atomization.
Re-circulating Tracing steam Pre-heating Pilot injection C
26. Main component of the engine to regulate speed is the ___________.
telegraph fuel rack valve gear governor D
27. A badly leaking refrigeration compressor discharge valves will cause __________.
damage to the condenser
flooding of the receiver
constant running of the compressor
overfeeding of the expansion valve
C
28. The by-products of oxidation, as a result of water contamination of hydraulic oil, are generally______.
removed by cellulose type filters
always neutralized by oil additives
harmless and have no effect on system components
gums, varnishes, and acids
D
29. The purpose of wear ring in the centrifugal pump is to ___________.
maintain alignment of shaft
prevent leakage minimize wear of impeller and casing
prevent damage to shaft
C
4 CCOOMMPPEETTEENNCCEE ## 44 OOPPEERRAATTEE MMAAIINN AAUUXXIILLIIAARRYY MMAACCHHIINNEERRYY AANNDD AASSSSOOCCIIAATTEEDD CCOONNTTRROOLL SSYYSSTTEEMMSS
30. Short cycling of a refrigeration compressor refers to_____________.
running too slow frequently starting and stopping
frequently grounding out
running too fast B
31. The heat gained per pound of refrigerant in the evaporator is known as the_______________.
sensible heat specific heat of vaporization
refrigerating effect latent heat of vaporization
C
32. Diesel engine jacket water is used in the fresh water distillation process as the __________.
primary means of producing a vacuum within the distiller
means of heating the feedwater
coolant for the distillate
coolant for the brine cooler
B
33. Parts of the pump used to maintain the alignment of the pump are_____.
wear rings bearings impeller lantern ring B
34. Which characteristic of the theoretical Otto cycle does not occur in the theoretical Diesel cycle.
Rapid pressure decrease during compression.
Rapid volume increase during combustion.
The entire fuel charge is present for ignition.
No pressure increase during combustion.
C
35. Stern tube is used to__________. transmit the power from main engine to propeller
reduce vibration of engine
protect the engine from its axial thrust
support and seal the propeller shaft
D
36. If the temperature of the fuel oil entering in atomizer is too low, the burner will __________.
produce smoke white
require more fuel for atomization
require more excess air for combustion
produce heavy black smoke at any load condition
D
37. Salinity cell is installed in the distilling unit to indicate the ____________.
quantity of freshwater produced
leaking tube amount of chemical to be added
quality of water produced
D
38. Main engine lube oil sump tank is located __________.
above the engine at the same level as the main bearing
at the bottom of the engine
next to the engine C
5 CCOOMMPPEETTEENNCCEE ## 44 OOPPEERRAATTEE MMAAIINN AAUUXXIILLIIAARRYY MMAACCHHIINNEERRYY AANNDD AASSSSOOCCIIAATTEEDD CCOONNTTRROOLL SSYYSSTTEEMMSS
39. It is a form of energy which crosses the boundary of a system during a change of state produced by a difference of temperature between the system and its surroundings.
Potential energy first law of thermodynamics
Heat Kinetic energy C
40. Burned gas from each cylinder is directed to the exhaust manifold which is part of___________.
2-stroke engine both 4-stroke engine and 2 stroke engine
4-stroke engine internal combustion engine
A
41. The purpose of expansion valve is to__________.
provide an orifice between the high pressure and low pressure side of the system
change the gas to a liquid
provide a chamber for the pre-expansion of the liquid
to speed-up the flow of refrigerant
A
42. The inlet pipe connection of dirty oil in disc type centrifugal purifier is located at the __________.
top of the bowl cover
bottom of the bowl cover
top and bottom of bowl cover
side of the bowl cover
A
43. The purpose of the low pressure cutout switch is to ____________.
maintain a preset suction pressure to the compressor
maintain liquid refrigerant at the suction of the compressor
start and stop the compressor at preset operating pressures
operate at minimum efficiency
C
44. Refrigerant is circulated through a refrigeration system by the ___________.
condenser compressor expansion valve evaporator B
45. The liquid indicator sight glass is generally located in the ____________.
high pressure vapor line
low pressure vapor line
high pressure liquid line
low pressure liquid line
C
6 CCOOMMPPEETTEENNCCEE ## 44 OOPPEERRAATTEE MMAAIINN AAUUXXIILLIIAARRYY MMAACCHHIINNEERRYY AANNDD AASSSSOOCCIIAATTEEDD CCOONNTTRROOLL SSYYSSTTEEMMSS
46. If an air compressor intercooler pressure rises above normal, it usually indicates __________.
dirty lube oil dirty intercooler hot environment leaking valves B
47. Breaking the fuel into fine spray to provide good combustion is called__________.
refining purifying honing atomizing D
48. A squeaking sound occurring from within an operating reciprocating air compressor is an indication of_______.
tight compressor bearings
compressor overload
motor overload badly leaking unloaders
A
49. A salinity indicating system functions on the basic principle of measuring the____.
hydrogen ion concentration of water
electrical conductivity of water
electrical inductance of water
specific gravity of water
B
50. Boiler fire side must be kept free of soot accumulations because ____.
soot interferes with the flow of feedwater
the steam drum internals will become clogged
the fuel oil heaters will become overloaded
soot insulates the boiler heating surfaces
D
51. A dehydrator installed in a refrigeration system is used to remove _____.
oil from the refrigerant
refrigerant from the oil
moisture from the system
noncondensable gases and vapors
C
52. Fluctuations in the pressure and temperature of the steam supplied to the first-effect of a low pressure submerged tube distilling plant will cause _____.
first effect scale formation to be loosened
pressure and temperature fluctuations in the entire unit
increased heat levels throughout the entire unit
decreased priming and lower salinity distillate
B
53. In a refrigeration system, the amount of superheat absorbed by the refrigerant is adjusted at the _________.
condenser expansion valve evaporator compressor B
7 CCOOMMPPEETTEENNCCEE ## 44 OOPPEERRAATTEE MMAAIINN AAUUXXIILLIIAARRYY MMAACCHHIINNEERRYY AANNDD AASSSSOOCCIIAATTEEDD CCOONNTTRROOLL SSYYSSTTEEMMSS
54. Salinity cell is installed in the distilling unit to indicate the______.
quantity of freshwater produced
leaking tube amount of chemical to be added
quality of water produced
D
55. In the refrigeration system, the refrigerant absorbs the latent heat of vaporization in the______.
evaporator compressor condenser liquid receiver A
56. In a low pressure air compressor, the loss of volumetric efficiency normally results from________.
heating of the air leaving the cylinders
adiabatic compression in the intercooler
inaccurate valve timing
constant enlargement of the clearance expansion volume
A
57. Air compressor cylinder unloader enable the compressor to_______.
vary their speed according to temperature and load
change speed according to overload demands
reduce compressed air charge density
start and come up to speed before air compression begins
D
58. Fuel oil enters the main engine cylinder through ______________.
plunger and barrel starting valve fuel oil injector oil spill valve C
59. The expansion tank for the jacket cooling water which is a closed cooling type is used to ___________.
maintain constant head in a system
allow easy release of air
prevent water leakage
reduce air contamination
A
60. Which of the following descriptions best identifies the operating principle of a flash-type evaporator?
Sea water is heated to boiling temperature while under a vacuum.
Sea water is passed over heated plates in a thin film.
Sea water is forced through a heated eductor
Heated sea water is injected into a vacuum chamber
D
61. A mooring winch should be equipped with mechanical brakes capable of holding_____.
50% over the working tension of the mooring line
the full breaking strength of the mooring line
half the breaking strength of the mooring line
the maximum expected tension of the mooring line
B
8 CCOOMMPPEETTEENNCCEE ## 44 OOPPEERRAATTEE MMAAIINN AAUUXXIILLIIAARRYY MMAACCHHIINNEERRYY AANNDD AASSSSOOCCIIAATTEEDD CCOONNTTRROOLL SSYYSSTTEEMMSS
62. The degree of fuel atomization in a diesel engine cylinder depends primarily on _______.
timing of the pump supply pressure to the pump
shape of the combustion chamber
the size of the holes in the fuel nozzle
D
63. The thermostatic expansion valve of a refrigeration system is opened ____________.
by refrigerant pressure and close by spring pressure
by spring pressure and close by refrigerant pressure
and close by spring pressure
and close by refrigerant pressure
A
64. Boyle's law can best be defined as _________.
the volume of an enclosed gas varies inversely with the applied pressure, provided the temperature remains constant
if the pressure is constant, the volume of an enclosed gas varies indirectly with absolute temperature
a body at rest tends to remain at rest.
None of the stated options
A
65. Kinetic energy is associated with _________.
heat movement and relative velocity
degree of atomic and molecular motion
relative position in respect to datum reference level
B
66. The "general energy equation" expresses energy in which of the following forms?
thermal potential kinetic All of the options D
67. The Brayton Cycle is one where the combustion event occurs at __________.
constant temperature
increasing pressure
constant pressure All of the options C
68. Heat is defined as _________. stored potential energy
thermal energy in transition
stored kinetic energy
All of the options B
9 CCOOMMPPEETTEENNCCEE ## 44 OOPPEERRAATTEE MMAAIINN AAUUXXIILLIIAARRYY MMAACCHHIINNEERRYY AANNDD AASSSSOOCCIIAATTEEDD CCOONNTTRROOLL SSYYSSTTEEMMSS
69. Which of the following statements is NOT one of Newton's laws?
A body at rest tends to remain rest and a body in motion tends to remain in motion.
For every action there is an equal and opposite reaction.
If the pressure is constant, the volume of an enclosed dry gas varies directly with the absolute temperature.
An imbalance of force on a body tends to produce an acceleration in the direction of that force which is directly proportional to the applied force and inversely proportional to the mass of the body.
C
70. A theoretical engine cycle is a process that _________.
takes place in the combustor of the engine
begins with certain conditions, progresses through a series of additional conditions and returns to the original conditions
begins with certain conditions, progresses to a steady state and stays there
None of the stated options
B
71. Rotating flyweights acting against a spring force makes up a simple type of __________.
governor reducing valve safety valve feedwater regulator
A
72. It is the state of a system wherein no heat flow takes place between its components.
Thermal unsteady state
Thermionic state Thermal equilibrium
Thermal temperature
C
10 CCOOMMPPEETTEENNCCEE ## 44 OOPPEERRAATTEE MMAAIINN AAUUXXIILLIIAARRYY MMAACCHHIINNEERRYY AANNDD AASSSSOOCCIIAATTEEDD CCOONNTTRROOLL SSYYSSTTEEMMSS
73. Which of the following represents the definition of energy?
energy is work that has been completed
energy is the capacity of work being done
energy is the capacity for producing and effect
energy is produced power
C
74. Which of the following statement is true about the laws of friction?
the magnitude of the force decrease up to a limiting value
the force is independent of the area of contact
friction acts so as to attract the motion of one body relative to another
the frictional force is greater than if motion is just to take place
B
75. Kinetic energy is the energy of the body has due to its
position temperature motion horsepower C
76. Work is conveniently expressed in: pounds per minute kilograms per minute
kilogram meter foot-pounds per minute
D
77. Power is the work done as 33,000 ft. pounds 2450 kilogram per unit of time work times distance
C
78. Vacuum refers to pressures 34 inches of mercury
31 inches of mercury
below atmospheric zero gauge C
79. Specific heaat of a substance is defined as the heat required to raise the temperature of
1 lb. of it to 1oC 1 kg. of it to 1oF 1 lb. of it to 1oF 10 lbs. of it to 1oF C
80. Too high alkalinity of boiler waer may cause
scale corrosion caustic embrittlement
acidity A
81. The number of cubic feet of fresh water that wil weigh one ton is
62 cu. Ft. 35.84 cu. Ft. 24.5 cu. Ft. 30.4 cu. Ft. B
82. The pressure due to a column of H2O one foot high is
.491 lbs/sq. in .434 lbs/sq. in .5 lbs/sq. in .625 lbs/sq. in B
83. Specific heat of water is: 1 10oF 100oC 212oF A
11 CCOOMMPPEETTEENNCCEE ## 44 OOPPEERRAATTEE MMAAIINN AAUUXXIILLIIAARRYY MMAACCHHIINNEERRYY AANNDD AASSSSOOCCIIAATTEEDD CCOONNTTRROOLL SSYYSSTTEEMMSS
84. Latent heat of evaporation of water is
100 BTU per lb 212 BTU per lb 100 calories per 970 BTU per lb. D
85. 23oC reads in absolute degrees centigrade as
123o AC 146o AC 276o AC 296o AC D
86. A pressure reading of 00.0 psig is theoritically equal to
14.7 psia 30.0 inches of water
30.0 inches of vacuum
00.0 psia A
87. Vacuum refers to pressures as 34 inches of mercury
32 inches of mercury
zero gauge below atmoshpheric
D
88. A motor ship cruising at average speed of 14.55 knots/hr. How far could it travel in one and one half day?
480.15 miles 356.47 miles 523.80 miles 494.70 miles C
89. In a Roots-type rotary blower, the volume of air delivered is directly proportional to __________.
engine speed engine load brake horsepower brake specific fuel consumption
A
90. Enthalpy is the number of heat energy a sustance contains above
100 degree celsius 32 degree farenheit
0 degree farenheit 212 degree farenheit
B
91. A mechanical and or hydraulic actin that prevents over correction of the energy medium supply in a governor which produces transient speed droop during a speed correction is known as
Stability compensation dead brand sensitivity B
92. What pressure is usually carried on a gland sealing system
6 to 8 LBS gauge pressure
4 to 5 LBS gauge pressure
8 to 10 LBS gauge pressure
2 to 3 LBS gauge pressure
D
93. The temperature at which a vapor liquifies is called
dew point condensation point vaporation point moisture point B
94. A`reversable adiabatic process is also called:
isobaric isometric isentropic isothermal D
12 CCOOMMPPEETTEENNCCEE ## 44 OOPPEERRAATTEE MMAAIINN AAUUXXIILLIIAARRYY MMAACCHHIINNEERRYY AANNDD AASSSSOOCCIIAATTEEDD CCOONNTTRROOLL SSYYSSTTEEMMSS
95. A 200 PSI new boiler should be subjected to a hydrostatic pressure of
400 PSI 300PSI 500 PSI 250 PSI B
96. Steam which is in physical contact with the boiling water from which it has been generated is termed:
unsaturated team pure steam wet steam saturated steam D
97. Saturated steam is a steam that has temperature at boiling point
contains moisture has temperature above boiling point
contains no moisture
B
98. Torque is a force which tend to produce
compressive power
work rotation stress D
99. Boiler horsepower is equivalent to 33,000 ft. lb. 33,475 BTUper hour
30,000 BTU per hour
30,000 ft. lbs. per minute
B
100. Absolute pressure is accurately indicated by
bourdon gauge mechanical gauge manometer barometer C
101. The process of changing a solid to a liquid is called the latent heat of
vaporization evaporation fusion condensation C
102. The proper treatment for shock is: raise the head give th victim warm liquid
keep the boy cool raise the feet D
103. Heat extracted in the process of changing a liquid to a solid is called the latent heat of
solidifcation fusion evaporation vaporization B
104. What is the principle which states that buoyant force acting on a body partially or completely immersed in a fluid is equal to the weight of fliud displaced?
Archimedes principle
Parallelogram Principle pf transmissilibility
Advance coefficient
A
105. A turbine is mecanical device, which produces work by converting__________.
potential energy into thermal energy
kinetic energy into thermal energy
thermal energy into kinetic energy
thermal energy into potential energy
C
13 CCOOMMPPEETTEENNCCEE ## 44 OOPPEERRAATTEE MMAAIINN AAUUXXIILLIIAARRYY MMAACCHHIINNEERRYY AANNDD AASSSSOOCCIIAATTEEDD CCOONNTTRROOLL SSYYSSTTEEMMSS
106. According to the fuel used this type of engine uses hih grade of fuel which is highly flammable __________________.
Internal combustion engine
External combustion engine
Diesel engine Gasoline engine D
107. An engine which run with petrol (or paffin) as the fuel are sometimes called as ____.
Internal combustion engine
Light oil engines Gasoline engine Petrol engine B
108. At pressure of 1.013 bar, or atmspheric pressure at sea level, water boils at _______.
373 K 100 F 66 C 87 C A
109. Find the area of a single cylinder engine whose piston diameter is 8.89 centimeters ___.
79.12 cm2 19.60 cm2 62.14 cm2 54.78 cm2 B
110. Heat exchanger used to heat the boiler feed water by means of waste gas as it passes thru series of tubes to the stack.
close condenser economizer oil heaters fresh water heat B
111. It is a series of events repeated in the same regular events________________.
cycle revolution stroke ratio A
112. It is defined as a product of the force and the distance travelled by the force measured along the line of action of the force .
energy work transfer acceleration heat transfer B
113. It is part of the engine that lowers the revolution of the main engine in relation to the driven shaft speed ____.
Engine flywheel Thrust bearing Reduction gear Vibration damper C
14 CCOOMMPPEETTEENNCCEE ## 44 OOPPEERRAATTEE MMAAIINN AAUUXXIILLIIAARRYY MMAACCHHIINNEERRYY AANNDD AASSSSOOCCIIAATTEEDD CCOONNTTRROOLL SSYYSSTTEEMMSS
114. It is scavenge system in a four stroke diesel engine where the intake and exhaust systems are controlled by intake and exhaust valve attached at the cylinder head ___.
Uniflow Cross flow Forced flow Loop flow D
115. It is study of the relationships between heat energy, work and the properties of matter, also of the conversions of heat energy and work by means of heat engines.
energy system applied heat boundary C
116. It is the hotness or coldness of the body.
intensity quantity energy potential energy A
117. __________ is the ratio of the volume of fuel charge at the beginning of the compression to the voulme at the end of compression .
compression stroke
Volume ratio Compression ratio Power stroke C
118. It is the tranfer of heat energy from one molecule to molecule
radiation conduction convection combination of conduction and convection
B
119. It is the transfer of heat energy through air,space, or vacuum.
evaporation radiation covection conduction B
120. Superheated steam is used in main turbine propulsion plants because superheated steam has ______.
Less specific volume per pound than saturated steam
Less specific energy than saturated steam
Greater pressure than saturated steam
Greater heat energy per pound than saturated steam
D
15 CCOOMMPPEETTEENNCCEE ## 44 OOPPEERRAATTEE MMAAIINN AAUUXXIILLIIAARRYY MMAACCHHIINNEERRYY AANNDD AASSSSOOCCIIAATTEEDD CCOONNTTRROOLL SSYYSSTTEEMMSS
121. The gas law represented by formula PV/T= constant is _____.
Charles' Law Boyles' Law Combination Gas Law
Standard Gas Law C
122. The kind of heat involves a transformation of matter from one physical state to anoter without changing its temperature.
latent heat applied heat heat energy latent heat of condensation
A
123. The main engine RPM must be lowered so that it will conform wit te RPM design of the propeller. This can be done by the installation of a _______.
Thrust bearing Vibration damper Turning gear Reduction gear D
124. The quantity of heat is affected by the amount of _____ that is present in the substance heated.
mass molecules atoms weight A
125. The speed of the ship's propeller through the water is 12.5 knots, however due to slip, the sip covers a distance of only 287 nautical miles in 24 hours. Calculate what percentage of the propeller speed does the slip represent?
10% 7.00% 6.80% 4.80% D
126. The volume swept by the piston from top dead center to bottom dead center is called__________.
compression ratio piston displacement
length of stroke swept volume B
127. This is the distance travelled by the piston from top to bottom or bottom to top ____.
Top dead center Revolution Bottom dead center
Stroke D
128. This is the temperature of a liquid in which boiling occurs?
saturation temperature
superheated temperature
vaporization latent heat A
16 CCOOMMPPEETTEENNCCEE ## 44 OOPPEERRAATTEE MMAAIINN AAUUXXIILLIIAARRYY MMAACCHHIINNEERRYY AANNDD AASSSSOOCCIIAATTEEDD CCOONNTTRROOLL SSYYSSTTEEMMSS
129. This kind of heat involves a transformation of matter form one physical state to another without changing its temperature.
latent heat of fusion
applied heat sensible heat latent heat of vaporization
D
130. This type of heat when added to a substance, it will result to a change in physical state without changing its temperature.
sensible heat latent heat latent heat of fusion
laten heat of vaporization
A
131. Turbulence is created in the cylinder in the cylinders of a diesel engine to ____________.
obtained injection lag
help mix fuel and air
increases combustion pressures
decreases combustion pressures
B
132. Two governors on diesel engines driving the same load require which of the following characteristics?
Speed droop and isochronous
Speed droop and high sensitivity
Isochronous and high sensitivity
Speed droop, isochronous and high sensitivity
D
133. What are the product of kinetic viscosity and the density of the oil at the temperature
Absolute density Absolute viscosity Kinematics viscosity
Viscosity index B
134. What is the equivalent of zero (0) Kelvin to degrees centrigade?
-273 C -460 C -32 C -180 C A
135. What kind of heat must be added to convert and ice (solid heat) to water (liquid state)?
latent heat of fusion
sensible heat latent heat of vaporization
applied heat A
136. When you are starting a diesel engine at temperature below 70 deg. F the functional resistance to turning will be ______.
Reduce by increasing lube oil pressure
Controlled by reducing the compensation ratio
Directly proportional to lube oil viscosity
Eliminated by eatin gthe intake air
C
17 CCOOMMPPEETTEENNCCEE ## 44 OOPPEERRAATTEE MMAAIINN AAUUXXIILLIIAARRYY MMAACCHHIINNEERRYY AANNDD AASSSSOOCCIIAATTEEDD CCOONNTTRROOLL SSYYSSTTEEMMSS
137. With a decreasing scavenging air pressure and increasing scavenging air temperature, the specific fuel consumption of the engine will:
remains constant not affect the engine performance
be reduced increased D
138. With referrence to anti-corrosive zincs when you do replace it with new one in case of sea water cooling engine?
If the zinc became less than 40% of its original size
If the zinc became brittle at the time of inspection
If the zinc became less than 15% of its original size
If the zinc have been in use for the last six months
A
139. With temperature held constant of a perfect gas , then the volume of a given mass is inversely proportional to the pressure of the gas is inversely proportional to the pressure of the gas
combination gas law
Charle's Law Boyle's Law Standard Gas Law C
140. During a change in temperature, the heat involved is known as ___________
sensible latent total residual A
141. If the pressure indicates 30 PSI what will be the equivalent in kgs/cm2?
1.8 2.1 2.8 3.1 B
142. It is the equivalent reading in Fahrenheit if the temperature reading is -40 degrees Celsius.
-32 -40 +32 +40 B
143. The pressure gauge indicates 2.5 kgs. Per cm2. What will be the pressure equivalent in pounds per square inch ( PSI )?
35.5 38.6 42.8 45.5 A
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144. The relationship between viscosity and specific gravity is ___________
Liquids with different viscosities will always have the same specific gravity
Liquids with different viscosities will never have the same specific gravity
Viscosity and specific gravity are directly proportional
Viscosity and specific gravity are not related in that one does not define or limit the other
D
145. The removing of moisture from air is a process known as _____
humidification dehumidification vaporization evaporation B
146. Power is defined as the __________.
rate of doing work amount of force needed to overcome friction
amount of work accomplished
distance through which an object is moved
A
147. What is a measure of the internal resistance of the fluid to the movement of the plate?
Specific viscosity Absolute viscosity Kinematic viscosity Average viscosity A
148. The push or pull excerted on a body is called ___________.
Inertia Moment Force Motion C
149. What element would thickened the lubricating oil when added?
Bentonite Potassium Zinc Lead A
150. What law staes that if the pressure of a confined gas is constant, the volume is directly proportional to the absolute temperature?
Dalton's law Kirchoff's law Law of Heat flow Charle's law D
151. In chemical notation a small suffix is used with the (symbol) letter to indicate the number of_________.
Atoms Molecules Weight Mass A
152. What is the distance from the centroidal axis of an area at which the entire area could be concentrated?
Moment of inertia Moments of gyration
Mass moment of inertia
Mass of moment of composite bodies
C
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153. The property of the body which resist changes in its state of rest or uniform motion in a straight called__________.
Kinetic energy Potential energy Inertia Radius of gyration C
154. Which of the following describes the purpose of a striker of double plate?
It provides landing surface for the sounding bob of a tank sounding tape
It provides to absorb machinery vibration
It provides a surface for the application of force
It provides to prevents valve stem over travel
A
155. What is the approximate composition of air by mass?
23% oxygen and 77% nitrogen
27% oxygen and 73% nitrogen
23% oxygen 77% hydrogen
27% oxygen and 73% hydrogen
A
156. A tonnage tax is levied according to the (NOT ENGINEERING QUESTION) INVALID
Gross tonnage of vessel
Maximum deadweight cargo tonnage on board
Displacement tonnage of the vessel
Net tonnage of vessel
D
157. What is the chemical symbols for fuel butane?
C4H10 C3H8 C2H6 C7H16 A
158. What is a measure of the rate on motion or speed of a body at any instant?
Inertia Velocity Kinetic energy Energy B
159. What is a measure of the tendency of a force acting in oppose along separate parallel lines of action?
Moment of force Couple Torque Twisting moment B
160. What is the usual unit for moment of inertia of an area?
Millimeter square Millimeter cube Millimeter to the fourth power
Millimeter to the power
C
161. An object that is subject to a force for a very short time is said to have received a/an _________.
Momentum Force Impulse Inertia B
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162. What is the property of a body which causes it to (tend ) remain in its existing state of rest or motion until acted by some force tending to change its existing state?
Velocity Kinetic energy Gravity Inertia D
163. What is considered in mechanics as the factor which tends to produce, modify or retard motion?
Force Power Work Weight A
164. What is the relationship between viscosity and specific gravity?
Viscosity and specific gravity are directly proportional
Liquids with different viscosities will never have the same specific gravity
Different viscosities will always have the same specific gravity
Viscosity and specific gravity are not related in that one does not define or limit the other
D
165. What element contain in the fuel that takes no active parts during combustion in an Internal Combustion Engine?
Oxygen Nitrogen Hydrogen Carbon B
166. Calcualte the area of ships steel plate measuring 1.8 meter wide and 6 meter long.
8.10 m2 8.01 m2 10.8 m2 10.9 m2 C
167. The turning moment which is the product of a tangential force and the distance it acts from the axis of the rotation is called ___________.
Torque Friction Torsion Twisting moment A
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168. What is the measure of the amount of solids classified as asphalts on carbon residue contained in an oil?
Neutralization number
Precipitation number
Total base number Carbonized number
B
169. What could result in fuel oil having a low octane rating?
Improved cold weather starting
Excessive fuel consumption
Reduced ignition lag
Smoother engine operation
B
170. As we heat a gas at constant pressure, what happen to its volume?
Increases Decreases Stays the same Comparable to the initial volume
A
171. The ratio of the absolute viscosity of oil to the specific gravity of oil is called ______.
absolute viscosity specific viscosity kinetic viscosity average viscosity B
172. The viscosity of the lube oil is rated in which of the following?
Second millimeter universal
Saybolt minutes universal
Saybolt second universal
Saybolt millimeter universal
C
173. Determine the weight of a rectangular piece of 25.5 lbs. steel measuring 4.5 feet by 6.7 feet.
591.2 lbs. 329.9 lbs. 768.8 lbs. 285.6 lbs. C
174. What is chemical symbol for fuel propane?
C3H8 C7H16 C3h8 C7H16 A
175. What is the ratio of fuel oil density to the density of water?
Viscosity index Specific gravity Latent heat Base number B
176. In diesel engines, which of the following is an equivalent of one horsepower?
0.5457kw 0.6457kw 0.7457kw 0.8457kw C
177. The horsepower and speed capability utilized by the engine without interruption is the ___ rating:
Maximum rating Intermittent rating Continuous rating Overall rating C
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178. A perfect vacuum is represented by gauge reading of ___________
30 in. Hg 24 in. Hg 15 in. Hg 10 in. Hg A
179. Solve the following equation: 2x + 5y= 20; Given y=5. Find the value of x?
-2.5 3.5 -4.5 5.5 A
180. If a continuous and steady flow of lube oil is provided, which of the listed pressures represents the lowest supply pressure at which a small high-speed bearing can be safely lubricated?
1 psig 5 psig 10 psig 15 psig A
181. Which of the significant combustible elements of fuel oil is a major source of air pollution?
Hydrogen Nitrogen Vanadium Sulphur D
182. The power developed within the engine cylinder and can be measured by an engine indicator called ______________.
indicated power shaft power brake horse power torsion power A
183. What is the ratio between the energy developed at the brake of the engine and the energy supplied?
Brake thermal efficiency
Mechanical efficiency
Scavenge efficiency
Volumetric efficiency
A
184. Isentropic compression is sometimes known as
constant volume compression
constant temperature compression
constant universal pressure compression
constant entropy compression
A
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185. What is similar to volumetric efficiency but used to described 2-stroke engine where some gas maybe included with the air at the start of compression?
volumetric efficiency
scavenge efficiency
mechanical efficiency
thermal efficiency B
186. The completely insulated system is operated in ______________.
isothermal process the junction polytrophic process
adiabatic process the isentropic process
C
187. It is defined as the capacity for doing work?
Energy Resistance Velocity Inertia A
188. In actual gasses, the molecular collisions are_____________.
only dependent on the momentum
inelastic plastic not visible nor known
B
189. Demulsibility is defined as _________________.
the ability of an oil separated from water
the measure of the water in the lube oil
the temperature at which oil flows rapidly
an emulsion of different oil grades
A
190. A measure of resistance to rotational acceleration called _____________.
moment of inertia mass moment of inertia
radius of gyration mass moment of inertia to composite bodies
B
191. Any liquid with a flash point above 80 is a ______________.
flammable liquid combustible liquid coal base oil synthetic base oil B
192. What is more nearly practical process?
Polytrophic operation
Isothermal operation
Adiabatic operation
Poly-is operation A
193. The acceleration of the body is directly proportional to the force applied to it inversely is known as ______________.
the law of inertia Newton's second law
mutual inductance law
Newton's law of action and reaction
B
194. What is the other name of inertia of an area?
Third moment of area
Dimensional moment of area
Second moment area
Sectional moment of area
C
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195. In the conservation of energy the heat rejected must be equal to _______.
heat added heat output heat partially added
heat not in thermal conductor
A
196. It is the usual unit for moment of inertia of an area millimeter?
Square Cube To the fourth power
To the fifth power C
197. What is a compression ratio? Ratio of the piston displacement plus clearance
Volume clearance Piston clearance Ratio of the piston and liner
A
198. The transfer of heat through electromagnetic flue wave an always travel with the gas is called the _________________
radiation heat transfer
volt-amp transfer thermal convection
universal conduction
A
199. Which of the following modes of heat transfer does NOT require any physical contact between a warmer and a cooler substance?
Radiation Conduction Natural convection Any of the options A
200. Which of the following statements is correct concerning heat transfer?
Heat is given off from a high temperature region known as a heat sink
Heat transfer rate is affected most by the size of the heat sink involved
Heat transfer rate is affected most by the temperature difference between the heat source and the heat sink
Heat transfer by radiation will only by mass motion of a fluid substance
C
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201. Which of the following statements is correct regarding Archimedes principles stating that the resultant pressure acting on a body when immersed in a fluid?
Acts vertically upward through the center of gravity of the displaced fluid and is equal to the weight of the fluid displaced
Will cause the body to have a reduction in mass equal in magnitude to the effective mass of the structure located above the line floatation
Is proportional in magnitude and direction, regardless of the direction originally developed when the object was submerged
Is applied equal and in all directions throughout the vessel in which it is Contained
A
202. The heat required to raise the temperature of 1 pound of any particular substance 1 F is called ______________.
its specific heat its latent heat a British thermal unit
its adiabatic heat A
203. Demulsibility of lube oil is defined as ______________.
the ability of oil to separate from water
the temperature at which oil flows rapidly
a measure of the water in a lube oil system
an emulsion of different grades of oil
A
204. Which of the following conditions must exist for heat to flow from one object to another?
the two objects must be in physical contact
the two objects must be the same size
there must be an existing temperature differential
there must be an existing weight differential
C
205. The ratio of the weight of moisture contained in a given volume of air, to the weight of moisture that the same sample would hold if saturated, and expressed in grains called the _______________.
absolute humidity relative humidity specific humidity total humidity A
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206. In the production of freshwater from seawater through a process of heating and cooling, the cooling phase of production is usually called ______.
evaporation distillation dehydration condensation D
207. Which of the following listed methods may be heat transferred from one body to another?
Radiation Convection Conduction all of the options D
208. Which of the following statements represents the function the nozzle assembly performs in an impulse turbine?
Converts the steam's thermal energy into kinetic energy by increasing its velocity, and directing if against the rotor blades
Provides an area where the steam is prevented from expanding prior to being directed against the rotor blades
Increase the velocity of the steam without a pressure drop across the impulse blading
Converts the potential energy of steam thermal energy by increasing its velocity and directing it against the turbine bladders
A
209. When air contains some moisture, but is not saturated; the dew point temperature is
between the wet and dry bulb temperature
equal to the total heat of air
higher than the wet bulb temperature
lower than the dry bulb temperature
D
210. Which of the listed statements best describes specific heat?
The amount of heat required to change the temperature of one pound of a material, one degree
The amount of heat required to change the temperature of one pound of ice, one degree F.
The amount of heat required to change the temperature of one pound butter, one degree F material, one degree
All of the options D
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211. Which of the following statements best describes the phrase "the heat of respiration"?
The total amount of heat the body is absorbing when undergoing CPR
The heat produced through the formation of carbon dioxide when harvested plant life absorbs oxygen
The heat developed by air as it flows through inlet air filters in a operating diesel engine
The heat developed by air as it flows through the air filters of an operating reciprocating compressor
B
212. What is the potential energy of an object weighing 10 pounds at a height of 10 feet?
10 ft-lb 20 ft-lb 100 ft-lb 1000 ft-lb C
213. Which of the effects listed describes the changers in the velocity and pressure of the steam as it passes through a nozzle?
Velocity increases and pressure increases
Velocity increases and pressure decreases
Velocity decreases and pressure increases
Velocity decreases and pressure decreases
B
214. How much work would be accomplished if a 15 pound box were raised to the top of a 25 foot platform?
15 ft-lb 25 ft-lb 40 ft-lb 375 ft-lb D
215. Thermal energy in transition is also referred to as ______________.
heat power horsepower foot-pound A
216. The equation "energy out" is a simple way stating the principle of the ____.
conservation of energy
conservation of matter
conversion of matter to energy
conversion of energy to mater
A
217. Which of the following statements represents the definition of energy?
Energy is work that has been accomplished
Energy is the capacity for producing an effect
Energy is work being done
Energy in power B
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218. A measurement of .625 is equal to _____________.
1/2 inch 9/16 inch 5/8 inch 3/4 inch C
219. An additive used to improve the ability of a lube oil to reduce friction is known as a/an __________.
suppressant additive
dispersant additive extremely pressure additive
viscosity improper additive
C
220. Which of the following best describes the effect on the pressure and volume relationship with regards to saturation gases?
As pressure decreases, volume increases
As volume increases, pressure increases
As volume decreases, pressure decreases
As pressure increases, volume increases
A
221. Which of the processes listed consumers the greatest amount of power and produces the greatest amount heat?
Overcoming sliding friction
Overcoming rolling friction
Overcoming fluid friction
Overcoming oil wedge friction
A
222. The tendency of a liquid to vaporize is indicated by its _____________.
fire point pour point flash point boiling point C
223. The theoretical minimum compression ratio necessary to ensure compression ignition in a direct injection diesel engine is _______________.
0.334027778 0.418055556 0.500694444 0.584027778 B
224. The quality of heat required to raise the temperature of a unit mass of a substance is known as ________________.
latent heat sensible heat of condensation
specific heat variable heat C
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225. How many fathoms is the equivalent of one shot when measuring the ship's anchor chain?
15 6 12 3 A
226. For safety reasons, the most important chemical or physical property of fuel and lubricating oils to consider when heating them before use is their. _________.
density calorific value viscosity flash point D
227. It is considered the smallest tank constructed on board world wide vessels that is being used for heavy fuel oils.
Collecting Storage Settling Service A
228. At pressure of 1.013 bar, or atmospheric pressure at sea level, water boils at ____________.
373 K 100 F 66C 87C A
229. What is the main purpose of lubrication?
To reduce wear and tear
To carry heat away from moving parts
To create free passage of oil
To increase efficiency of engine
A
230. The maintenance of the oil film of a lubricant is affected by the____________.
thinner grade of oil working temperature of the engine
excessive "drag" of the moving parts of the engine
thicker grade of oil B
231. Which of the following statements is true regarding mechanical seals?
Mechanical seals maybe used in lieu of conventional packing for any service other than saltwater
Mechanical seals are not suitable for use on fuel oil transfer pumps
By adjusting spring compression leakage may be reduced
Mechanical seals are normally lubricated and cooled by the fluid being pumped
D
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232. Under the type of lubrication what do you call the condition where some lubricant is present but the two bearing surfaces in relative motion are not completely by the film of lubricant?
Boundary or "thin film" lubricant
Fluid or "thick film" lubrication
Lubrication and viscosity
Reducing friction and wear
B
233. What grade of oil may cause a breakdown of the oil film, resulting in rapid wear and possible seizure of the working parts?
Thin Heavy Thick Viscous A
234. The property of oil that concerns the ease with which an oil flows through the oil pipe lines and spreads over the bearing surfaces is called_______________.
flow quality viscosity pour point flash point A
235. What is the equivalent of zero(0) degree Kelvin to degree centigrade?
-273 -460 -32 -180 A
236. In general if heat is added to a substance, the temperature of the substance will increase and if heat is taken away the temperature will______________.
remain the same gradually remain decrease be transferred C
237. It is known as the series of events repeated in the same regular events.
Revolution Stroke Cycle Ratio C
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238. What will be the probable caused of lube oil from main propulsion machinery having an increases neutralization number?
acidity has increased
viscosity has decreased
demulsibility has improved
tendency to foam is guaranteed to occur
A
239. The detergent are used in lubricating oils MAINLY to ________________.
reduce the viscosity number
prevent oxidation of the oil
reduce foaming prevent sludge deposits
D
240. What is the best way of checking heat cracks?
By using magnetic particle test
By using x-ray By applying pressure test
By using dye penetrants
A
241. A high reading of 100 or more viscosity index given to an oil indicates a ______________.
contamination of oil being use
large variation in viscosity with temperature change
small variation in viscosity with temperature change
high quality of oil C
242. An oil additive used or added to keep oil fluid at low temperature is_________________.
pour point despersant
anti-foaming additive
dispersants viscosity index improver
A
243. One of the factors that affect the air-conditioning load is______________.
corrosion solar radiation magnetic field heat transmission B
244. The lube oil temperature leaving the lube oil coolers is regulated by throttling the__________.
cooling water outlet valve
cooling water inlet valve
lube oil outlet valve
lube oil return flow valve
A
245. What is the equivalent of zero(0)degree Kelvin to degrees centigrade?
_273C _460C _32C _180C A
246. It is the type of heat when added to a substance, will cause an increase in temperature without changing it physical state.
Sensible heat Latent heat latent heat of fusion
Latent heat of vaporization
A
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247. In a compression type automatic grease cup, the lubricant is forced into the bearing by __________.
gravity flow spring force a pressure gun a zerk fitting B
248. With reference to a vessel's structural integrity, the most significant characteristic of a cryogenic liquid is its __________.
capability of causing brittle fractures
highly corrosive action on mild steel
vapor cloud which reacts violently with saltwater
toxicity at atmospheric pressure
A
249. The heat required to change a substance from a solid to a liquid while at its freezing temperature, is known as the latent heat of __________.
fusion vaporization condensation sublimation A
250. The heat required to change a substance from a liquid to a gas without experiencing a temperature change, is defined as the latent heat of __________.
fusion vaporization sublimation condensation B
251. The portion of a hydraulic hose that determines its overall strength, is the __________.
inner tube braided inner layers)
outer cover outer armor B
252. A weight of 1,000 kips is equivalent to __________.
1,000 pounds 2,000 short tons 2,240 pounds 500 short tons D
253. The size of flexible hose used in a hydraulic system is indicated by __________.
the inside diameter of the tube
the numerical designation found on the 'skin' of the hose
a color code on the armor
the thickness of the tube wall
B
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254. Latent heat can be defined as the heat which must be added to a substance in order to change it from a __________.
solid to liquid liquid to vapor solid to vapor All of the options D
255. A pressure reading of 00.0 psig is theoretically equal to __________.
30.0 inches of vacuum
300 millimeters of water
14.7 psia 00.0 psia C
256. Which of the listed chemicals can be routinely used to maintain the hygienic quality of potable water?
Hydrochloric acid Chlorine Sulfuric acid Zinc chromate B
257. An organic solid lubricant, such as graphite, is suitable as an oil additive when used in __________.
machinery bearings subjected to high temperatures
antifriction bearings on general service pumps
bearings subject to fluctuating loads
line shaft bearings A
258. For the various sizes of tubing and wall thickness used in a hydraulic system, the inside diameter can be determined if it is remembered that the inside diameter equals the outside diameter less __________.
the wall thickness 1.5 times the wall thickness
2 times the wall thickness
2.5 times the wall thickness
C
259. The greatest difference between absorbent and adsorbent filters is that absorbent filters __________.
will remove additives from the lube oil
soak up liquid contaminants directly into the filter media
do not create pressure drops in the lube oil system
attract or have liquid contaminants stick to the surface of the filter media
B
260. The graphite in a bearing lubricant compound of graphite grease, acts as a __________.
low temperature sealer
moisture barrier filler to smooth surface irregularities
coolant to carry away heat
C
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261. What would you do after adding grease to a ball bearing with a handheld grease gun?
You should run the machine with the bearing housing drain plug open for a short while
You should close the bearing housing drain and add a little extra grease to compensate for air pockets in the bearing
You should remove the grease fitting and leave open to allow excess grease to escape
You should save the used grease for chemical analysis
A
262. In addition to a pressure gauge and a relief valve, an air receiver should be fitted with a __________.
sight glass and manhole
thermometer and sight glass
thermometer and manhole
drain connection D
263. The difference between the pressure at a point being measured and that of a perfect vacuum is known as __________.
internal pressure gauge pressure absolute pressure external pressure C
264. An additive used to improve the ability of a lube oil to reduce friction is known as a/an __________.
suppressant additive
dispersant additive extreme pressure additive
PH alkaline additive
C
265. Which of the units of measurement listed below are used to express positive and negative suction heads when calculating pump head or hydraulic horsepower?
Inches of mercury for positive head and feet of water for negative head
Feet of water for positive head and inches of mercury for negative head
Inches of mercury for both positive and negative heads
Feet of water for both positive and negative heads
D
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266. The ability of lubricating oils to resist viscosity changes during temperature changes is indicated by the __________.
American Petroleum Institute number
viscosity index number
Seconds Staybolt Furol number
Seconds Saybolt Universal number
B
267. Which of the additives listed is used to reduce the foaming tendency of lube oil?
Emulsifiers Suppressants Depressants Extreme pressure B
268. Which of the following statements is correct concerning the viscosity of lubricating oil?
Viscosity will increase as temperature increases.
Viscosity is a measure of a fluid's internal resistance to flow.
Viscosity will decrease as temperature decreases.
Viscosity is not dependent on temperature.
B
269. The pour point of lubricating oils is affected the most by which of the following?
Extensive centrifuging
Wax content Water content Acid content B
270. The viscosity of an oil is a measure of its __________.
weight internal friction demulsibility S.A.E. number B
271. On vessels using reach rods to manually control the tank valves, one turn of the hand wheel on deck will produce how many turns of the valve stem at the valve?
One-fourth of a turn
One-half of a turn Three-fourths of a turn
One turn D
272. The flash point of most lube oils used in a main lubricating system should be approximately __________.
80F to 100F 140F to 160F 250F to 300F 350F to 450F D
273. Which of the listed characteristics of lube oil are the most important to the engineer from an operational standpoint?
Ash content, carbon residue, and gravity
Viscosity, acidity, and demulsibility
Pour point, flash point, and precipitation number
Autoignition point, viscosity index, and film strength
B
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274. A salinity indicating system functions on the basic principle of measuring the __________.
electrical inductance of water
electrical conductivity of water
specific gravity of water
hydrogen ion concentration of water
B
275. Where should an S-type trap and drain properly used?
Used for for all lavatory sink installations, as no other drain type is useable
Used whenever the 'gray' water drain system connection is located in the deck
Used whenever the 'gray' water drain system connection is located in a bulkhead
Used as a condensate drain for superheaters
B
276. The component which is used to thoroughly separate small, fine, dust-like particulate contamination from hydraulic fluid is a/an __________.
accumulator filter separator strainer B
277. The sensible heat of air is dependent upon the __________.
dry bulb temperature
wet bulb temperature
saturation temperature
water vapor superheat
A
278. Which of the following statements describes the relationship between flash point and ignition temperature?
Both are higher than normal burning temperatures.
The flash point is always higher.
The ignition temperature is always higher.
They are not necessarily related.
C
279. When the pressure on a compound gage is released, the gage pointer is returned to zero psig by action of the __________?
Bourdon tube spring return arm compound diaphragm
compensating spring
A
280. A lube oil filter can be used to remove most contaminants from lube oil. What is the contaminant which will remain in the lube oil after filtering?
acid fuel oil sediment water B
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281. How can the percentage of impurities in a specific fuel oil sample be determined?
settling in a fuel tank
testing in a laboratory centrifuge
burning in a calorimeter
testing in a closed cup
B
282. Which of the following statements describes the actions of an axial piston motor with a full deflection variable position tilting box?
Control over speed, direction, and stopping would be better than having the pump equipped with the tilting box.
Maximum speed when rotated in the 'hauling in' direction would be obtained with the tilting box just prior to neutral stroke, while 'pay out' would be the opposite.
Maximum torque, when rotated in the 'pay out' direction would be obtained with the tilting box just prior to neutral stroke, while 'hauling in' would be the opposite.
Maximum speed in either direction of rotation would be achieved just beyond of neutral stroke, making reversal of direction difficult.
D
283. A ship travels 234.02 nautical miles in 24 hours at an average propeller speed of 60 RPM. If the propeller pitch is 20.07 feet, what is the propeller slip during this passage?
0.1795 0.2046 0.221 0.262 A
284. What is the equivalent in inches having a reading of .625 inches?
15/32 inches 9/16 inches 5/8 inches 35/64 inches C
285. The disc of a relief valve has an area of 0.85 square inches when seated, lifts at a set point pressure of 250 psi. When the valve lifts, the area of the disc exposed to pressure increases by 20%. At what pressure does the valve reseat?
208 psi 227 psi 231 psi 250 psi A
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286. When stopper is inserted into the spout of a closed container in which water has been heated to a temperature of 212F. If additional thermal energy is imparted, what changes will occur to the pressure and temperature inside the container?
both pressure and temperature will rise
pressure alone will rise
temperature alone will rise
only a change of state will occur
A
287. Which of the listed values represents the temperature of saturated vapor for water at a pressure of 14.7 psia?
198F (92C) 212F (100C) 335F (168C) 414F (212C) B
288. The boiling point of water in an open container at sea level is 212F. What will happen to the boiling point when the pressure on the open container is decreased?
increase decrease increase and then decrease
decrease and then increase
B
289. Which of the following terms would best describe the temperature at which a liquid boils at a given pressure?
Degree of saturation
Saturation temperature
Superheated temperature
Degree of superheat
B
290. A vapor under pressure stays in contact with, and at the same temperature as the liquid from which it was generated. What do you call the vapor and liquid in this situation?
equilibrium contact latent contact critical state superheated state A
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291. Which of the following conditions must exist for heat to flow from one object to another?
The two objects must be in physical contact.
The two objects must be the same size.
There must be an existing temperature differential.
There must be an existing weight differential.
C
292. Machinery operating features are designed to help conserve energy. Which of the following results will not contribute to energy conservation?
Reduction of friction.
Insulation of hot surfaces.
Lubrication of moving parts.
Elevation of heat exchanger overboard outlet temperatures.
D
293. If 1 Horsepower equals 42.45 BTU's per minute, then the energy required to lift a 1 pound (.454 kg) weight, 778 feet (.24 km), against the force of gravity, What would be the number of BTU's required to raise the temperature ?
1 ounce (28.3 g) of water 1F (.55C)
1 quart (.95 l) of water 1F (.55C)
1 gallon (3.78 l) of water 1F (.55C)
1 pound (.454 kg) of water 1F (.55C)
D
294. Which of the following statements concerning the operation of a single-acting hydraulic ram is correct?
Hydraulic force is applied simultaneously in two directions against the ram by directional ports.
The single-acting ram is both extended and retracted by means of hydraulic force.
The single-acting ram is not retracted by means of hydraulic force.
Hydraulic force applied to a single-acting ram results in a pulling motion.
C
295. Which of the following statements concerning energy is correct?
Energy can be created or destroyed.
Energy may not be transformed.
The total quantity of energy in the universe is always the same.
None of the stated options
C
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296. What is the quantity of heat required to raise the temperature of a unit mass of a subtance?
latent heat sensible heat specific heat capacity
variable heat C
297. Which of the following terms is used to indicate that the addition of heat will result in a temperature change?
Latent heat Sensible heat Sublimation heat Critical point heat B
298. A machine capable of producing 1650 foot-pounds of work per second is considered to produce how much horsepower?
1 hp 2 hp 3 hp 4 hp C