U.S.C.G. Merchant Marine Exam DDE - 1000/4000 HP …. Merchant Marine Exam DDE - 1000/4000 HP Q630 Motor Plants Illustrations: 21 Choose the best answer to the following multiple-choice

National Maritime Center Providing Credentials to Mariners

U.S.C.G. Merchant Marine Exam

DDE - 1000/4000 HP

Q630 Motor Plants

(Sample Examination)

Page 1 of 35 Q630 Motor Plants

4/3/2018

U.S.C.G. Merchant Marine Exam DDE - 1000/4000 HP Q630 Motor Plants Illustrations: 21

Choose the best answer to the following multiple-choice questions.

1. What statement concerning fuel cetane rating and the ignition delay period is true as it applies to towboat main propulsion diesel engines?

o (A) The ignition delay period is the lag in time between when fuel injection is initiated and when fuel injection actually begins, and the higher the cetane rating of the fuel the longer the ignition delay period.

o (B) The ignition delay period is the lag in time between when fuel injection is initiated and when fuel injection actually begins, and the higher the cetane rating of the fuel the shorter the ignition delay period.

o (C) The ignition delay period is the lag in time between when fuel injection actually begins and when combustion actually begins, and the higher the cetane rating of the fuel the longer the ignition delay period.

• (D) The ignition delay period is the lag in time between when fuel injection actually begins and when combustion actually begins, and the higher the cetane rating of the fuel the shorter the ignition delay period.

If choice D is selected set score to 1.

2. For diesel engines, such as those used for main propulsion and auxiliary power on river push boats, while running at speed, how is the ignition of fuel within the cylinder achieved?

• (A) Ignition is achieved by the heat of compression created by compressing intake/charge air within the cylinder into a relatively small volume.

o (B) Ignition is achieved by intense heat by passing electric current through the element of a specially designed glow plug.

o (C) Ignition is achieved by the heat of compression created by compressing the air/fuel mixture within the cylinder into a relatively small volume.

o (D) Ignition is achieved by a high voltage electric spark induced across the gap of a specially designed spark plug.

If choice A is selected set score to 1.

3. Suppose the diesel generator set drive engines are of the type shown in the illustration on your ship docking tug. What description best represents the operating cycle and aspiration method? Illustration MP-HS-07

o (A) Naturally aspirated, two-stroke cycle engine o (B) Crankcase scavenged, two-stroke cycle engine. • (C) Roots-blown, two-stroke cycle engine. o (D) Roots-blown, four-stroke cycle engine.

If choice C is selected set score to 1.


4/3/2018

U.S.C.G. Merchant Marine Exam DDE - 1000/4000 HP Q630 Motor Plants Illustrations: 21 4. You are assigned to a towing vessel fitted with main propulsion diesel engines of the type shown in

the illustration. If the engine's crankshaft is turning at 900 rpm, what will be the rotational speed of the two camshafts? Illustration MP-MS-12

o (A) 450 rpm • (B) 900 rpm o (C) 1800 rpm o (D) Not enough information is given to determine camshaft rpm.

If choice B is selected set score to 1.

5. Suppose the diesel generator set drive engines are of the type shown in the illustration on your towing vessel. Assuming the engine is naturally aspirated, within an individual cylinder in terms of piston stroke and position, under what circumstances are the intake and exhaust valves both open? Illustration MP-HS-03

o (A) When the piston is at bottom dead center (BDC) transitioning from the intake stroke to the compression stroke.

• (B) When the piston is at top dead center (TDC) transitioning from the exhaust stroke to the intake stroke.

o (C) When the piston is at bottom dead center (BDC) transitioning from the power stroke to the exhaust stroke.

o (D) When the piston is at top dead center (TDC) transitioning from the compression stroke to the power stroke.


6. The tractor tug to which you are assigned is fitted with main propulsion diesel engines of the type shown in the illustration. In terms of valve operating gear, cylinder liner type, and connecting rod type, what statement is true? Illustration MP-MS-12

• (A) This is an overhead cam engine, with jacketed cylinder liners and hinged-strap, fork-and-blade connecting rods.

o (B) This is a pushrod operated overhead valve engine, with wet cylinder liners and hinged-strap, fork-and-blade connecting rods.

o (C) This is an overhead cam engine, with wet cylinder liners, and marine-type connecting rods. o (D) This is a pushrod operated overhead valve engine, with jacketed cylinder liners and

conventional connecting rods.


7. The river push boat to which you are assigned has a main propulsion engine of the type shown in the illustration. In terms of piston action, operating cycle, and piston type, what statement is true concerning this engine type? Illustration MP-MS-03

o (A) This is a single-acting, two-stroke cycle, crosshead piston type engine. o (B) This is a double-acting, four-stroke cycle, opposed piston type engine. • (C) This is a single-acting, two-stroke cycle, opposed piston type engine. o (D) This is a double-acting, two-stroke cycle, crosshead piston type engine.



4/3/2018

U.S.C.G. Merchant Marine Exam DDE - 1000/4000 HP Q630 Motor Plants Illustrations: 21 8. When checking the crankcase oil level on a main propulsion engine on your ship-docking tug while

en-route to picking up the ship, what should be the oil level as indicated on the dipstick?

o (A) The level should be below the ADD mark on the side of the dipstick marked with engine IDLE and oil HOT.

• (B) The level should be between the FULL and ADD marks on the side of the dipstick marked with engine IDLE and oil HOT.

o (C) The actual level is unimportant as long as it is visible on the dipstick when the engine is running.

o (D) The level should be well above the FULL mark on the side of the dipstick marked with engine IDLE and oil HOT.


9. In preparation for getting a tug-barge unit underway, if enough time has elapsed since the last main engine shutdown, it may be necessary to blow down the engine's cylinders to expel any accumulated water or oil. What statement concerning cylinder blow down is true?

• (A) The engine is rolled over with no fuel delivery and with the cylinder test valves (indicator cocks) open.

o (B) The engine is rolled over with fuel delivery and with the cylinder test valves (indicator cocks) closed.

o (C) The engine is rolled over with fuel delivery and with the cylinder test valves (indicator cocks) open.

o (D) The engine is rolled over with no fuel delivery and with the cylinder test valves (indicator cocks) closed.


10. The ocean-going tug to which you are assigned is fitted with auxiliary engines as partly shown in the illustration. What statement is true concerning the valve guide and valve seat arrangements? Illustration MP-HS-03

o (A) The valve guides and the valve seats are both integral (non-replaceable). • (B) The valve guides and the valve seats are both replaceable inserts. o (C) The valve guides are integral (non-replaceable), and the valve seats are replaceable inserts. o (D) The valve guides are replaceable inserts, and the valve seats are integral (non-replaceable).


11. The river push boat to which you are assigned is fitted with generator engines as partly shown in the illustration. What statement is true concerning the cylinders? Illustration MP-HS-03

o (A) The cylinder liners are of the jacketed type and are replaceable inserts. o (B) The cylinder liners are of the dry type and are replaceable inserts. • (C) The cylinder liners are of the wet type and are replaceable inserts. o (D) The cylinder walls are integral (non-replaceable) to the cylinder block.



4/3/2018

U.S.C.G. Merchant Marine Exam DDE - 1000/4000 HP Q630 Motor Plants Illustrations: 21 12. (6.3.3.5-4) ship-docking tug, what should be the oil level as indicated on the dipstick?

• (A) The level should be between the FULL and ADD marks on the dipstick. o (B) The actual level is unimportant as long as it is visible on the dipstick. o (C) The level should be below the ADD mark on the dipstick. o (D) The level should be well above the FULL mark on the dipstick.


13. When starting a towing winch drive engine in preparation for towing operations, what parameter must be checked FIRST upon start-up to avoid immediate engine damage?

• (A) Engine lubricating oil supply header pressure. o (B) Winch gear oil pump discharge pressure. o (C) Fuel oil supply header pressure. o (D) Cylinder jacket water pump discharge pressure.


14. The generator drive engines fitted on your harbor tug are started by the type of starter shown in figure "A" of the illustration. What type of starter is shown? Illustration MP-SR-09

o (A) Sliding vane air motor o (B) Turbine type air motor • (C) Axial piston hydraulic motor o (D) Radial piston hydraulic motor


15. The various auxiliary diesel engines fitted on your harbor tug may employ a variety of different cranking methods for engine starting. What type of cranking motor is shown in the illustration? Illustration MP-SR-04

• (A) Air cranking motor o (B) Electric cranking motor o (C) Gasoline engine cranking motor o (D) Hydraulic cranking motor


16. The main propulsion engines onboard your harbor tug use a lubricating oil system as shown in the illustration. What item number represents the scavenging lube oil pump? Illustration MP-LO-07

o (A) 2 • (B) 4 o (C) 9 o (D) 12



4/3/2018

U.S.C.G. Merchant Marine Exam DDE - 1000/4000 HP Q630 Motor Plants Illustrations: 21 17. The main propulsion engines onboard your tractor tug use a lubricating oil system as shown in the

illustration. What item number represents the lubricating oil filter? Illustration MP-LO-07

o (A) 2 • (B) 5 o (C) 10 o (D) 12


18. The main propulsion diesel engines used to power the ship-docking tug to which you are assigned are started with vane-type air-starting motors designed to operate at 250 psig. The in-line lubricator should provide 3 drops of oil per cranking minute, as long as the in-line lubricator oil viscosity is as specified. If the start air pressure is within the normal range and the oil viscosity is correct, but the oil injection rate is only 1 drop per minute, what should be done?

o (A) The starting air pressure supplied to the air-starting motors should be increased. • (B) The in-line lubricator oil injection metering needle valve should be further opened. o (C) The in-line lubricator oil injection metering needle valve should be further closed. o (D) The oil in the in-line lubricator should be replaced with oil of lower viscosity than specified.


19. A diesel generator set on your salvage tug has a simplex lube oil strainer of the type shown in the illustration, situated on the discharge side of the lube oil pump. At a specified engine rpm and lube oil temperature, you notice that the pressure drop becomes unacceptably high. When you rotate the cleaning handle, you notice that it is extremely difficult to rotate. What should be done? Illustration MO-0057

o (A) No special consideration need be taken as long as the cleaning handle (A) rotates, even if it rotates with great difficulty.

o (B) The cleaning handle (A) should be forced to rotate, even if it requires an extender handle to produce greater rotating torque.

o (C) After stopping the engine, the drain plug (B) should be removed to drain the accumulated sludge from the strainer sump.

• (D) After stopping the engine, the strainer element should be withdrawn and soaked in solvent to break up the heavy deposits on the disk stack (C).


20. In terms of the diesel fuels burned in auxiliary and main propulsion diesel engines used on board towing vessels, which of the listed fuel properties would be most critical to consider when transferring and forwarding fuel in extremely low ambient temperature conditions?

• (A) Pour point o (B) Heating value o (C) Ash content o (D) Flash point



4/3/2018

U.S.C.G. Merchant Marine Exam DDE - 1000/4000 HP Q630 Motor Plants Illustrations: 21 21. Concerning the diesel fuels used for the auxiliary and main propulsion diesel engines used on board

the towing vessel to which you are assigned, what fuel property is directly a measure of the ignition quality of the fuel?

o (A) Density o (B) Heating value • (C) Cetane rating o (D) Viscosity


22. Which of the following fuel systems is characterized by a complete absence of high-pressure fuel lines?

• (A) Unit injector type system. o (B) Rotary plunger type system. o (C) Common rail type system. o (D) In-line multi-plunger type system.


23. What maintenance practice represents the best protection against moisture carryover to the fuel injection system of the main engines on board your towing vessel?

o (A) Closing the diesel oil day tank vents, particularly when the relative humidity is high. • (B) Periodically opening, and then reclosing, the drain valve on coalescing type diesel oil filters. o (C) Periodically opening, and then reclosing, the vent valve on coalescing type diesel oil filters. o (D) Frequently replacing fuel injection pump and injector nozzle inlet fuel filters.


24. The harbor tug to which you are assigned has a diesel engine fitted with a rotary plunger distributor type pump. Which figure of the illustration represents the most likely type of fuel injection equipment used? Illustration MP-FI-19

o (A) 1 o (B) 2 o (C) 3 • (D) 4



4/3/2018

U.S.C.G. Merchant Marine Exam DDE - 1000/4000 HP Q630 Motor Plants Illustrations: 21 25. The harbor tug to which you are assigned has main engines fitted with open type combustion

chambers featuring direct injection. Of the listed figures below found in the illustration, which figure represents the most likely type of injector nozzle type? Illustration MP-FI-18

• (A) 1 o (B) 2 o (C) 3 o (D) 4


26. The river push boat to which you are assigned has diesel generators fitted with intake and exhaust systems as shown in the illustration. What does the component labeled "2" represent? Illustration MP-IX-06

o (A) Wet muffler • (B) Charge air manifold o (C) Charge air cooler o (D) Exhaust manifold


27. The sea-going tug to which you are assigned has main engines fitted with intake and exhaust systems as shown in the illustration. What statement is true concerning the turbocharger charge air discharge arrangements? Illustration MP-IX-08

o (A) It is not possible to determine the turbocharger charge air discharge arrangements in this particular drawing.

o (B) The left side turbocharger discharges charge air to the left cylinder bank, and the right side turbocharger discharges charge air to the right cylinder bank.

• (C) The left side turbocharger discharges charge air to the right cylinder bank, and the right side turbocharger discharges charge air to the left cylinder bank.

o (D) The left side turbocharger discharges charge air to both cylinder banks, and the right side turbocharger discharges charge air to both cylinder banks.


28. The tractor tug to which you are assigned has main engines fitted with intake and exhaust systems as shown in the illustration. What statement best describes the configuration of the multiple turbochargers? Illustration MP-IX-08

o (A) Two (2) turbochargers are used and configured in series for a two-staging effect to boost charge air pressure.

o (B) Four (4) turbochargers are used and configured in series for a four-staging effect to boost charge air pressure.

o (C) Four (4) turbochargers are used; two for each cylinder bank, to reduce exhaust back pressure.

• (D) Two (2) turbochargers are used, one for each cylinder bank, to reduce exhaust back pressure.



4/3/2018

U.S.C.G. Merchant Marine Exam DDE - 1000/4000 HP Q630 Motor Plants Illustrations: 21 29. The sea-going tug to which you are assigned has main engines fitted with intake and exhaust

systems as shown in the illustration. What statement is true concerning the turbocharger exhaust piping arrangements? Illustration MP-IX-08

o (A) The left side turbocharger receives exhaust gas from both cylinder banks, and the right side turbocharger receives exhaust gas from both cylinder banks.

• (B) The left side turbocharger receives exhaust gas from the left cylinder bank, and the right side turbocharger receives exhaust from the right cylinder bank.

o (C) The left side turbocharger receives exhaust gas from the right cylinder bank, and the right side turbocharger receives exhaust gas from the left cylinder bank.

o (D) It is not possible to determine the turbocharger exhaust piping arrangements in this particular drawing.


30. The diesel engines on your towing vessel are all protected with dry-type air filters. The air filters should be inspected and replaced in accordance with manufacturer instructions. What is the generally accepted criteria that would dictate when filter replacement becomes necessary?

o (A) The air filter element should be replaced when the pressure rise across the element decreases below the specified minimum.

o (B) The air filter element should be replaced when the pressure rise across the element increases above the specified maximum.

o (C) The air filter element should be replaced when the pressure drop across the element decreases below the specified minimum.

• (D) The air filter element should be replaced when the pressure drop across the element increases above the specified maximum.


31. The fresh water cooling systems serving the main engines of your towing vessel are of the type shown in the illustration. What statement accurately describes the characteristics of the fresh water cooling circuit? Illustration MP-CW-15

o (A) The fresh water circuit is a vented system using an automotive type 2-way thermostatic control valve for temperature control.

o (B) The fresh water circuit is a pressurized system using an automotive type 2-way thermostatic control valve for temperature control.

o (C) The fresh water circuit is a pressurized system using a stationary/marine type 3-way thermostatic control valve for temperature control.

• (D) The fresh water circuit is a vented system using a stationary/marine type 3-way thermostatic control valve for temperature control.



4/3/2018

U.S.C.G. Merchant Marine Exam DDE - 1000/4000 HP Q630 Motor Plants Illustrations: 21 32. You are replacing an automotive type cooling water thermostat on one of the diesel generator sets

on your ship docking tug. The markings on the original thermostat indicate that it was set to begin opening at 180oF. Which of the following thermostats marked for Celsius would be a replacement that comes closest to the value at which opening begins as compared to the original thermostat?

o (A) 70oC • (B) 80oC o (C) 90oC o (D) 100oC


33. Wire brushing and scraping can be used to remove hard carbon deposits from exhaust system surfaces. When cleaning exhaust systems associated with the diesel engines on the tug to which you are assigned, what technique can effectively be used in conjunction with mechanical cleaning to loosen and soften up these hard carbon deposits?

o (A) Sand blasting with diamond dust • (B) Treating with carbon penetrating solvent o (C) Baking off carbon with heat lamps o (D) Treating with carbon tetrachloride solvent


34. The auxiliary engines on the ocean-going tug to which you are assigned are fitted with Roots-blowers as shown in the illustration. What statement is true concerning the timing gears as shown in figure "A"? Illustration MP-CA-12

o (A) The timing gears are straight cut and insure that the blower rotor lobes are properly spaced apart with a close tolerance.

o (B) The timing gears are straight cut and insure that the blower is properly timed to the engine's crankshaft.

o (C) The timing gears are helically cut and insure that the blower is properly timed to the engine's crankshaft.

• (D) The timing gears are helically cut and insure that the blower rotor lobes are properly spaced apart with a close tolerance.


35. The river pushboat to which you are assigned is fitted with main propulsion reduction gears as shown in the illustration. What statement is true concerning this type of reduction gear? Illustration MP-DS-16

o (A) This type of reduction gear is used with a controllable pitch propeller and a reversing engine. o (B) This type of reduction gear is used with a fixed pitch propeller and a reversing engine. • (C) This type of reduction gear is used with a fixed pitch propeller and a non-reversing engine. o (D) This type of reduction gear is used with a controllable pitch propeller and a non-reversing

engine.



4/3/2018

U.S.C.G. Merchant Marine Exam DDE - 1000/4000 HP Q630 Motor Plants Illustrations: 21 36. You are assigned to a tractor tug with a drive system as shown in figure "A" of the illustration. What

type of propulsion drive system is illustrated? Illustration MP-DS-09

• (A) Cycloidal propeller drive o (B) Azimuthing propeller drive (z-drive) o (C) Conventional fixed-propeller drive o (D) Controllable pitch propeller drive


37. The two-stroke cycle main propulsion engines on the harbor tug to which you are assigned are fitted with turbochargers for scavenging purposes. Assume that you are checking the air box drains in an installation that is valved with external drain piping to a drains tank. When you open the air box drain valves, no drainage occurs when in fact there is an accumulation of oil and moisture on the floor of the air boxes. What should you do?

o (A) Blow through the drain openings with compressed air to clear the drains. o (B) Increase the crankcase pressure to blow the air box drain openings clear. • (C) Mechanically poke through the drain openings with a rod to clear the drains. o (D) Increase the air box pressure to blow the air box drain openings clear.


38. The lubricating oil system supporting the main propulsion reduction gear on the salvage tug to which you are assigned is fitted with a sea water-cooled 4-pass shell and tube lube oil cooler. The water box sacrificial zinc anodes must be inspected periodically. Which of the following listed actions correctly states maintenance criteria pertaining to scale build-up on the zincs as the result of mineral deposits (not to be confused with corrosion scaling)?

• (A) Any accumulated scale build-up on sacrificial zinc anodes should be scraped off until the zinc anodes are shiny.

o (B) Any accumulated scale build-up on sacrificial zinc anodes should be left intact to ensure proper protection from galvanic corrosion.

o (C) Any sacrificial zinc anodes with accumulated scale build-up should be replaced regardless of the degree of deterioration.

o (D) There is no need to check for scale build-up on the sacrificial zinc anodes, as this phenomenon is not physically possible.


39. The main engines on your river towboat are fitted with speed control governors of the type shown in the illustration. What technology is used to transmit the desired speed setting from the navigational bridge to the final input signal to the engine governor? Illustration MP-GV-03

o (A) Mechanical (cable or chain). o (B) Electronic (variable DC current). • (C) Pneumatic (variable control air pressure). o (D) Hydraulic (variable control oil pressure).



4/3/2018

U.S.C.G. Merchant Marine Exam DDE - 1000/4000 HP Q630 Motor Plants Illustrations: 21 40. Suppose each of the main propulsion engines on your harbor assist tug is equipped with a variable

speed governor equipped with a solenoid actuated shutdown device. After a high temperature alarm, after continuing to rise, what is the most likely engine high temperature condition that would initiate a safety trip shutdown?

o (A) High fuel temperature • (B) High jacket water temperature o (C) High charge air temperature o (D) High exhaust temperature


41. The pneumatic propulsion control system used on your integrated tug-barge unit uses a diaphragm-operated relay valve as shown in the illustration. Periodically, the valve is to be disassembled for cleaning and inspection. What statement best describes the proper method for lubrication upon reassembly? Illustration MO-0052

• (A) O-rings should be lubricated with a silicone-based grease. o (B) O-rings should be lubricated with penetrating oil. o (C) O-rings should be lubricated with desiccant powder. o (D) O-rings should not be lubricated by any means.


42. Suppose the main propulsion diesel engines on your river pushboat are fitted with pressure-compensated governors as shown in the illustration. What function does the engine lube oil pressure connection provide? Illustration MP-GV-03

o (A) It is used as a governor lubricant and as a hydraulic power medium for the power cylinder. o (B) It is used solely for the purpose of achieving engine shutdown on low engine lube oil

pressure. o (C) It is used solely for the purpose of activating an alarm on low engine lube oil pressure. • (D) It is used for both activating an alarm and achieving engine shutdown on low engine lube oil

pressure.


43. The thermal fluid heating oil system on your articulated tug-barge unit is configured similarly to that shown in the illustration. What system component performs expansion and dearation functions? Illustration MP-SP-23

o (A) 1 o (B) 2 o (C) 4 • (D) 5



4/3/2018

U.S.C.G. Merchant Marine Exam DDE - 1000/4000 HP Q630 Motor Plants Illustrations: 21 44. The heating boiler on your harbor tug is of the type shown in the illustration. Which of the following

arrangements describe a boiler of this type? Illustration MP-SP-11

• (A) The boiler is of the water-tube type and utilizes forced circulation. o (B) The boiler is of the fire-tube type and utilizes natural circulation. o (C) The boiler is of the fire-tube type and utilizes forced circulation. o (D) The boiler is of the water-tube type and utilizes natural circulation.


45. The auxiliary oil-fired water-tube steam boiler on your sea-going tug is equipped with a water column similar to that shown in the illustration. If the gauge glass becomes disabled or there is uncertainty associated with the gauge glass reading, the tri-cocks can be used to determine the boiler water level. What statement best describes the challenge associated with trying to differentiate between steam and water? Illustration MO-0093

• (A) On a tri-cock situated below the water level, when opened some of the escaping water will flash to steam.

o (B) On a tri-cock situated below the water level, when opened all of the escaping water will flash to steam.

o (C) On a tri-cock situated above the water level, when opened all of the escaping steam will condense to water.

o (D) On a tri-cock situated above the water level, when opened some of the escaping steam will condense to water.


46. If the water level as indicated by the gauge glass of an auxiliary boiler is in question, it should be blown down. Which of the following statements represents the proper procedure for performing a gauge glass blow down?

o (A) The gauge glass should be blown down twice; first with the upper cut-out valve open and then with the lower cut-out valve open.

o (B) The gauge glass should be blown down once with both the upper cut-out and lower cut-out valves open simultaneously.

o (C) The gauge glass should be blown down once with the lower cut-out valve open. • (D) The gauge glass should be blown down twice; first with the lower cut-out valve open and then

with the upper cut-out valve open.


47. Since towing vessels take on fresh water from shore as a source of make-up water for the closed, re-circulating cooling water systems supporting diesel engines, what property of the make-up water is most important in contributing to cooling system problems?

o (A) The amount of dissolved oxygen (and other various gases). o (B) The degree of contamination of suspended solids, such as sand. o (C) The degree of contamination with microbiological organisms. • (D) The amount of dissolved solids associated with mineral content.



4/3/2018

U.S.C.G. Merchant Marine Exam DDE - 1000/4000 HP Q630 Motor Plants Illustrations: 21 48. A main propulsion diesel engine on your ship docking tug has experienced a safety shutdown=n due

to high lubricating oil temperature. What is the appropriate response?

o (A) Immediately restart the engine and monitor the oil temperature to verify the cause of the shutdown.

o (B) Allow the engine to cool off for two minutes, then restart and monitor the lubricating oil temperature to verify the cause of the shutdown.

o (C) Immediately perform the engine inspections to determine the cause of the high oil temperature safety shutdown.

• (D) Allow 2 hours for the engine to cool down before attempting to inspect the engine and correct the cause of the trip before attempting to restart the engine.


49. When rolling over a main engine on your river push boat prior to starting with the cylinder test valves open to expel any fluids accumulated within the cylinders, a rather large amount of water is discharged. What is the appropriate response?

o (A) Start the engine, but maintain the jacket water expansion tank level higher than normal. o (B) Start the engine, but run the engine with the cylinder test valves cracked slightly open. • (C) Do not allow the engine to be started until the cause of the water discharge has been

determined and corrected. o (D) Start the engine, but monitor all fluid levels very closely, especially that of the jacket water.


50. The towing vessel to which you are assigned is gear-driven with one main propulsion diesel engine and a fixed-pitch propeller. While underway, the main engine becomes disabled, requiring your vessel to be towed back into port. If pressurized lubricating oil is not available to the reduction gear shaft bearings, what must be done during the towing operation?

• (A) The reduction gear output shaft must be prevented from rotating by means of locking the propeller shaft.

o (B) The reduction gear input shaft must be prevented from rotating by means of engaging the engine turning gear at the flywheel.

o (C) The reduction gear input and output shafts must be prevented from rotating by means of blocking the gear teeth.

o (D) The reduction gear input shaft must be prevented from rotating my means of engaging the propulsion clutch.



4/3/2018


3/27/2015

MO-0052

Adapted for testing purposes only from WABTEC H5 Relayair Valve, Operation and

Maintenance Instruction. © 2000 WABCO Locomotive Products.

Further reproduction prohibited without permission. Page 15 of 35 Q630 Motor Plants


4/15/2015

MO-0057

Adapted for testing purposes only from GUNTHER, Lubrication.

Copyright © 1971 by Raymond C. Gunther.

Further reproduction prohibited without permission.

A

B

D

C



8/10/2016

MO-0093

Adapted for testing purposes only from MAGNETROL, Installation, Maintenance, Operating

Instructions for Models W126, W127, W251, W252, W291

Copyright © Magnetrol division of Schaub Engineering Co.

Further reproduction prohibited without permission. Page 17 of 35 Q630 Motor Plants

National Maritime Center

Providing Credentials to Mariners

7/31/2017

MP-CA-12

Adapted for testing purposes only from KATES, Diesel and High

Compression Gas Engines, 3rd

Edition

Copyright © 1974 by American Technical Society

Further reproduction prohibited without permission




8/1/2017

MP-CW-15 EMD Engine Fresh Water

Cooling System with Heat Exchanger

Adapted for testing purposes only from Marine Propulsion Unit Operating Manual

Copyright © 1988 by Electro-Motive Division, General Motors Corporation





8/9/2017

MP-DS-09 Tractor Tug Drives

Adapted for testing purposes only





8/3/2017

MP-DS-16 Reversing Reduction

Gear Operation

Adapted for testing purposes only from Engineman 3

NAVEDTRA 14331





9/22/2017

MP-FI-18

Adapted for testing purposes only from NORMAN Diesel Technology:

Fundamentals, Service, Repair

Copyright © 2007 by The Goodheart-Wilcox Company, Inc.





9/27/2017

MP-FI-19

Adapted for testing purposes only




10/2/2017

MP-GV-03 Woodward Type PGA Governor Schematic Diagram

Adapted for testing purposes only from 645E7B Turbocharged

Marine Engine/Systems, 1st

Edition

Copyright © 1980 Electro-Motive Division of General Motors

Further reproduction prohibited without permission Page 24 of 35

Q630 Motor Plants



10/23/2017

MP-HS-03

Adapted for testing purposes only from TOBOLDT,

Diesel Fundamentals, Service, Repair

Copyright © 1973 by the Goodheart-Willcox Co., Inc.





10/17/2017

MP-HS-07

Adapted for testing purposes only from TOBOLDT,

Diesel Fundamentals, Service, Repair

Copyright © 1973 by the Goodheart-Willcox Co., Inc.





10/25/2017

MP-IX-06

Adapted for testing purposes only from WOODYARD, Pounder’s Marine

Diesel Engines and Gas Turbines

Copyright © 2009 by Elsevier, Ltd.





9/5/2017

MP-IX-08

Adapted for testing purposes only from KNAK, Diesel Motor Ships’

Engines and Machinery; Diagrams

Copyright © 1990 by The Institute of Marine Engineers




12/4/2017

MP-LO-07

Adapted for testing purposes only from BAKER, Diesel Engines and Electric Power Copyright © 1998 by The University of Texas at Austin




11/9/2017

MP-MS-03 Fairbanks Morse Diesel Engine

Adapted for testing purposes only from KATES, Diesel and High Compression Gas Engines, 3rd Edition

Copyright © 1974 by American Technical Society Further reproduction prohibited without permission



3/5/2018

MP-MS-12

Adapted for testing purposes only from EMD 645E9 Turbocharged Engine Maintenance Manual

Copyright © 1973 Electro-Motive Division, General Motors. Further reproduction prohibited without permission.




8/24/2017

MP-SP-11 Once-through Boiler

Adapted for testing purposes only from HARRINGTON, Marine Engineering

Copyright © 1992 by the Society of Naval Architects and Marine Engineers


Q630 Motor Plants



8/25/2017

MP-SP-23 Thermal Fluid Heating Oil System

Adapted for testing purposes only from Fulton Installation and Operation Manual

Vertical Coil Design Thermal Fluid Heater Model FT-C and FT-S

Copyright © 2013 by The Fulton Companies




3/2/2015

MP-SR-04

Adapted for testing purposes only from Replacement Parts Catalog No. 302, Diesel

Engines Model 645, 2nd

Edition. Copyright © 1985 Electro-Motive Division, General

Motors. Further reproduction prohibited without permission.

21

27 26

25 24

23

22

28

30

31

32

33

34

35

36

37

29



11/29/2017

Fig. B: Adapted for testing purposes only from KUIKEN,

Diesel Engines for Ship Propulsion and Power Plants Copyright © 2012 by Target Global Energy Training Further reproduction prohibited without permission

MP-SR-09 Starting Motors

Fig. A: Adapted for testing purposes only from STINSON,

Diesel Engineering Handbook Copyright © 1981 by Business Journals, Inc.


Q630 Motor Plants

Documents

U.S.C.G. Merchant Marine Exam DDE - 1000/4000 HP …. Merchant Marine Exam DDE - 1000/4000 HP Q630 Motor Plants Illustrations: 21 Choose the best answer to the following multiple-choice