Q.1
Which of the following instruments displays the harmonics of a distorted signal?
  • Digital multimeter
  • Spectrum analyzer
  • Oscilloscope
  • Wave analyzer
Q.2
A class B amplifier operates in the linear region for
  • slightly more than 180° of the input cycle.
  • 360° of the input cycle.
  • slightly less than 180° of the input cycle.
  • much less than 180° of the input cycle.
Q.3
Which amplifier is commonly used as a frequency multiplier?
  • class A
  • class B
  • class C
  • all of the above
Q.4
Calculate the harmonic distortion component for an output signal having a fundamental amplitude of 3 V and a second harmonic amplitude of 0.V.
  • 3.83%
  • 38.3%
  • 83.3%
  • 8.33%
Q.5
Which type of amplifier uses pulse (digital) signals in its operation?
  • Class A
  • Class B or AB
  • Class C
  • Class D
Q.6
Determine what maximum dissipation will be allowed for a 70-W silicon transistor (rated at 25ºC) if derating is required above 25ºC by a derating factor of 0.6 W/ºC at a case temperature of 100º.
  • 25 W
  • 30 W
  • 35 W
  • 40 W
Q.7
The Q-point is at cutoff for class ________ operation.
  • A
  • B
  • C
  • AB
Q.8
What is the maximum efficiency of a class A circuit with a direct or series-fed load connection?
  • 90%
  • 78.5%
  • 50%
  • 25%
Q.9
Which class of amplifier operates in the linear region for only a small part of the input cycle?
  • A
  • B
  • C
  • AB
Q.10
Class AB operation is ________ operation.
  • similar to class A
  • similar to class B
  • similar to class C
  • None of the above
Q.11
The principal advantage(s) of MOSFETs over BJTs is (are)
  • their biasing networks are simpler.
  • their drive requirements are simpler.
  • they can be connected in parallel for added drive capability.
  • all of the above
Q.12
Which of the following instruments allows more precise measurement of the harmonic components of a distorted signal?
  • Digital multimeter
  • Spectrum analyzer
  • Oscilloscope
  • Wave analyzer
Q.13
What is the ratio of the secondary voltage to the primary voltage with the turn ratio in the windings?
  • N2/N1
  • (N1/N2)2
  • (N1/N2)1/3
  • N1 × N2
Q.14
Class ________ amplifiers are normally operated in a push-pull configuration in order to produce an output that is a replica of the input.
  • A
  • B
  • C
  • AB
Q.15
The main features of a large-signal amplifier is the circuit's ________.
  • power efficiency
  • maximum power limitations
  • impedance matching to the output device
  • All of the above
Q.16
Class B operation is provided when the dc bias leaves the transistor biased just off, the transistor turning on when the ac signal is applied.
  • True
  • False
Q.17
The principal advantage(s) of BJTs over MOSFETs is (are) that
  • voltage drop across the transistor is important.
  • they are not as prone to ES
  • both of the above
  • none of the above
Q.18
A class A amplifier has a voltage gain ofand a current gain ofWhat is the power gain?
  • 30
  • 25
  • 1.2
  • 750
Q.19
For BJT power transistors, the collector terminal is always connected to the transistor's case
  • for easy circuit connection.
  • to prevent shorts.
  • because the collector terminal is the critical terminal for heat dissipation.
  • because the collector terminal is located nearest the case.
Q.20
Categorize the power efficiency of each class of amplifier, from worst to best.
  • A, B, AB, D
  • A, AB, D, B
  • A, AB, B, D
  • All of above
0 h : 0 m : 1 s