Slide 1
EASYEASYMATHEMATICS
He was known as the father of modern geometry
EASYANSWER
Euclid
EASYEST
a flat conductor separated by an insulating dielectric from a large ground plane that is usually one-quarter or one-half wavelength long
EASYANSWER
microstrip
EASYEST
One complete revolution around a Smith Chart represents _________ wavelengths.
EASYANSWER
1/2
EASYMathematics
These are circles that have the same center.
EASYANSWER
concentric circles
EASYCommunication
The modulated peak value of a signal is 125V and the unmodulated carrier value is 85V. What is the modulation index?
10EASYANSWER
0.47
EASYCommunication
A mismatched transmission line is also referred to as a ___________ line.EASYANSWER
resonant
EASYCommunications
It is the ratio of the speed of propagation on a line to that of light in free-space.
EASYANSWER
velocity factor
EASYElectronics
Which of the following is the most widely used UTP cable that can carry baseband data at rates up to 100 Mbps at a range up to 100m?
EASYANSWER
CAT 5
EASYGEAS
This component measures the pulling (or pushing) action perpendicular to the section
EASYANSWER
Axial forces
EASYGEAS
It is the point at which there is an appreciable elongation of the material without any corresponding increase of load
EASYANSWER
Yield point
averageaverageCOMMUNICATION
Determine the phase-shift represented by a 75 ns delay of a 4 MHz signal to a 75-ft cable with a dielectric constant of 2.3.
EASYANSWER
108 degrees
averageEASYSOLUTION
= 360 td / TT =1/f = 1 / 4MHz = 250 ns = 360 (75) / 250 = 108 degrees
averageEASYEST
The input to an FM receiver has a S/N of 2.8. What is the frequency deviation caused by the noise if the modulating frequency is 1.5KHz and the permitted deviation is 4KHz?
averageEASYANSWER
547.8 Hz
averageEASYSolution
= fm = sin -1 N/S = sin -1 1/2.8 = 0.3652 = (0.3652)(1.5KHz) = 547.8 Hz
averageEASYEST
What circuit is used to return the frequency response of a signal to its normal, flat level?
averageEASYANSWER
de-emphasis
averageEASYMathematics
Let k be the number of gallons of a 50% silver nitrate solution that are added to 15 gallons of a 30% silver nitrate solution to produce a 35% silver nitrate solution. Let w be the number of sides of a regular polygon whose degree measure of one of the exterior angles is 8. Find the value of (k+w).
averageEASYANSWER
50averageEASYMathematics
In how many distinct points do the real graphs of
Intersect?
average
33EASYANSWER
2
averageEASYGEAS
It is the maximum safe stress that a material can carry
averageEASYANSWER
working stress
averageEASYCommunications
It is the most common means of overcoming the problems of quantizing error and noise.
averageEASYANSWER
companding
averageEASYElectronics
It can be used in a single-stage oscillator circuit to provide a pulse signal suitable for digital-circuit applications.
averageEASYANSWER
UJT or unijunction transistor
averageaverageGEAS
A large pipe, called a penstock in hydraulic work, is 1.5 m in diameter. It is composed of wooden staves bound together by steel hoops, each 300 sq. Millimetre in cross-sectional area, and is used to conduct water from a reservoir to power a house. If the maximum tensile stress permitted in the hoops is 130 MPa, what is the maximum spacing between hoops under a head of water of 30 m?
AVErageANSWER
L = 177 mm
AVErageSOLUTION
(1000)(9.81)(30)(1.5)L = 2(300x10^-6)(130x10^6)L = 177 mm
averageGEAS
At what angular velocity will the stress in a rotating steel ring equal to 150 MPa if its mean radius is 220 mm? The density of the steel is 7.85 Mg/m^3.
AVErageANSWER
628 rad/s
AVErageANSWER
= (1/0.22)(150x10^6 / 7850)^(1/2) = 628 rad/s
DifficultdifficultCOMMUNICATION
It means that the characteristics and performance of an antenna are the same whether the antenna is radiating or intercepting an electromagnetic signal.
EASYANSWER
antenna reciprocity
difficultEASYEST
Which of the following methods is used to lower the resonant frequency of a shortened vertical antenna?
difficultEASYANSWER
top hat loading
difficultEASYEST
Calculate the gain (relative to an isotropic) of a parabolic antenna that has a diameter of 3 m, an efficiency of 60% and operates at a frequency of 4 GHz.
difficultEASYANSWER
39.8 dBi
difficultEASYSOLUTION
G = 2 D2/ 2 = 3x108/ 4MHz = 0.075 m
G = 0.62(3)2 0.0752G= 9474.8G = 10 log 9474.8G = 39.8 dBi
difficultEASYMathematics
Team A and B play a series of games. The first to win two games wins the series and Team A has a 70% chance of winning any game. What is the probability that Team A wins the series?
difficultEASYANSWER
0.784
difficultEASYMathematics
difficult
57EASYANSWER
49difficultEASYCommunication
It is a phenomenon caused by any support insulators used at the ends of the wire antenna.
difficultEASYANSWER
end effect
difficultEASYElectronics
difficult
EASYANSWER
16.2 HzdifficultEASYSOLUTION
difficult
EASYGEAS
A pipe carry steam at 3.5 MPa has an outside diameter of 450 mm and a wall thickness of 10 mm. A gasket is inserted between the flange at one end of the pipe and a flat plate use to cap the end. How many 40-mm-diameter bolts must be used to hold the cap on if the allowable stress in the bolts is 80 MPa, of which 55 MPa is the initial stress?
difficultEASYANSWER
N = 17
difficultEASYSOLUTION
N = (3.5x10^6)(0.45 2x0.01)^2 / [(0.04^2)(8855)x10^6] N= 16.18 round upN = 17
difficultDifficultGEAS
A pipe carry steam at 3.5 MPa has an outside diameter of 450 mm and a wall thickness of 10 mm. A gasket is inserted between the flange at one end of the pipe and a flat plate use to cap the end. What circumferential stress is developed in the pipe?
DifficultANSWER
= 75.3 MPa
DifficultSOLUTION
= (3.5)(450 2x10) / [2(10)] = 75.3 MPa
DifficultGEAS
A steel rod having a cross-sectional area of 300 sq. Meters and a length of 150 m is suspended vertically from one end. It supports a tensile load of 20 kN at the lower end. If the unit mass of steel is 7850 kg/m^3 and E = 200x10^3 MN/m^2, find the total elongation of the rod.
DifficultAnswer
= 54.3 mm
DifficultANSWER
= [(7850)(9.8)(150^2) / 2(200X10^9)] + [(20000)(150)(1000^2) / 300(200X10^9)]
= 54.3 mm