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Electrical Engineering
Transistor Audio Power Amplifiers
Quiz 1
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Q.1
Low efficiency of a power amplifier results in ___________
Low forward bias
Less battery consumption
More battery consumption
None of the above
Q.2
A power amplifier has comparatively ___________ ß
Small
Large
Very large
None of the above
Q.3
Power amplifiers generally use transformer coupling because transformer per-mits
Cooling of the circuit
Impedance matching
Distortionless output
Good frequency response
Q.4
What will be the collector efficiency of a power amplifier having zero signal power dissipation of 5 watts and a.c. power output of 2 watts?
20%
80%
40%
50%
Q.5
A transformer coupled class A power amplifier has a load of 100 Ω on the secondary. If the turn ratio is 10:1, what is the value of load appearing on the primary?
5 kΩ
20 kΩ
100 kΩ
10 kΩ
Q.6
The driver stage usually employs___________
Class A power amplifier
Push-pull amplifier
Class C amplifier
None of the above
Q.7
When a transistor is cut off___________
Maximum voltage appears across transistor
Maximum current flows
Maximum voltage appears across load
None of the above
Q.8
If the gain versus frequency curve of a transistor amplifier is not flat, then there is distortion.
Amplitude
Intermodulation
Frequency
None of the above
Q.9
If the power rating of a transistor is 1W and collector current is 100mA, then maximum allowable collector voltage is ___________
1V
100V
20V
10V
Q.10
The output stage of a multistage amplifier is also called ___________
Mixer stage
Power stage
Detector stage
F stage
Q.11
A class A power amplifier uses ___________
Two transistors
Three transistors
One transistor
None of the above
Q.12
The maximum efficiency of transformer coupled class A power amplifier is ___________
30%
50%
80%
45%
Q.13
The most important consideration in power amplifier is ___________
Biasing the circuit
Collector efficiency
To keep the transformer cool
None of the above
Q.14
The maximum collector efficiency of class B operation is ___________
50%
90%
5%
5%
Q.15
Class C power amplifier has the highest collector efficiency
C
A
B
AB
Q.16
Power amplifiers handle ___________ signals compare to voltage amplifiers
Small
Very small
Large
None of the above
Q.17
The pulsating d.c. applied to power amplifier causes ___________
Burning of transistor
Hum in the circuit
Excessive forward voltage
None of the above
Q.18
What turn ratio (Np/Ns) of transformer is required to match 4 Ω speaker to a transistor having an output impedance of 8000 O?
2
7
3
None of the above
Q.19
The size of a power transistor is made considerably large to ___________
Provide easy handling
Dissipate heat
Facilitate connections
None of the above
Q.20
Class ___________ operation gives the maximum distortion
A
B
C
AB
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