ENGINEERING > ELECTRONICS
1) An adiabatic process is one in which
A) no heat enters or leaves the gasB) the temperature of the gas changes
C) the change in internal energy is equal to the mechanical work doneD) all of these
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Answer : all of these


2) The width of the depletion layer /region of a P-N junction
A) decreases with light dopingB) increases with heavy doping
C) is independent of the applied voltageD) is increased under reverse bias
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Answer : is increased under reverse bias


3) The main purpose of modulation is to
A) combine two waves of different frequenciesB) achieve wave shaping of the carrier wave
C) transmit low frequency information over long distances efficientlyD) produce sidebands
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Answer : transmit low frequency information over long distances efficiently


4) The resultant of two equal forces (F) acting in opposite directions will be
A) 2 X FB) ?2 F
C) 0.707 FD) zero
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Answer : zero


5) Two elements that are frequently used in making transistors are
A) Iridium and TungstenB) Lead and Tin
C) Iron and CarbonD) Silicon and Germanium
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Answer : Silicon and Germanium


6) The basic reason why a full-wave rectifier has twice the efficiency of a half-wave rectifier is that
A) it makes use of a transformerB) its ripple factor is much less
C) it utilizes both half-cycles of the inputD) its frequency output is double the line frequency
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Answer : it utilizes both half-cycles of the input


7) The expansion of e-PPS is
A) Electronic project proposal systemB) Electronic population prediction system
C) Electronic polymer purchasing systemD) Electronic petrol purchasing system
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Answer : Electronic project proposal system


8) The current waveform i(t) in a pure resistor of 20 ? is shown in the figure.
The power dissipated in the resistor is
A) 135 W
B) 270 W
C) 540 W
D) 14.58 W
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Answer : 540 W


9) A 20 dB directional coupler is shown in the figure.
The power output at port will be
A) 10 mW
B) 1 mW
C) 5 mW
D) 2 mW
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Answer : 1 mW


10) The driving-point impedance of the network shown in the figure has zero at -4 and poles at -2j5.
If Z(0)=1, the values of R,L and C are respectively
A) 14,1 and 429
B) 1,14 and 429
C) 429,14 and 1
D) 1,2 and 229
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Answer : 1,14 and 429