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
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