Transistor Audio Power Amplifier Quiz | Transistor Audio Power Amplifier Objective Type Questions and Answers

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Questions
21 The most costly coupling is ……………… coupling
A RC
B Direct
C Impedance
D Transformer

Answer: Transformer
22 If the gain versus frequency curve of a transistor amplifier is not flat, then there is distortion.
A Amplitude
B Intermodulation
C Frequency
D None of the above

Answer: Frequency
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23 The disadvantage of impedance matching is that it ………………….
A Gives distorted output
B Gives low power output
C Requires a transformer
D None of the above

Answer: Gives distorted output
24 The pulsating d.c. applied to power amplifier causes ……………..
A Burning of transistor
B Hum in the circuit
C Excessive forward voltage
D None of the above

Answer: Hum in the circuit
25 An AF amplifier is shielded to …………
A Keep the amplifier cool
B Protect from rusting
C Prevent induction due to stray magnetic fields
D None of the above

Answer: Prevent induction due to stray magnetic fields
26 The most important consideration in power amplifier is ………..
A Biasing the circuit
B Collector efficiency
C To keep the transformer cool
D None of the above

Answer: Collector efficiency
27 The output transformer used in a power amplifier is a ……………. transformer
A 1:1 ratio
B Step-up
C Step-down
D None of the above

Answer: Step-down
28 Transformer coupling can be used in …………… amplifiers
A Either power or voltage
B Only power
C Only voltage
D None of the above

Answer: Either power or voltage
29 Power amplifiers generally use transformer coupling because transformer permits……..
A Cooling of the circuit
B Impedance matching
C Distortionless output
D Good frequency response

Answer: Impedance matching
30 A transformer coupled class A power amplifier has a load of 100 O on the secondary. If the turn ratio is 10:1, what is the value of load appearing on the primary?
A 5 kO
B 20 kO
C 100 kO
D 10 kO

Answer: 10 kO
31 What turn ratio (Np/Ns) of transformer is required to match 4 O speaker to a transistor having an output impedance of 8000 O?
A 2
B 7
C 3
D None of the above

Answer: 7
32 The class B push-pull circuit can deliver 100 W of a.c. output power. What should be the minimum power rating of each transistor?
A 20 W
B 40 W
C 10 W
D 80 W

Answer: 20 W
33 The push-pull circuit must use …………… operation
A Class A
B Class C
C Class B
D Class AB

Answer: Class B
34 For the same a.c. power output as above, what should be the minimum power rating of transistor for class B operation?
A 10 W
B 4 W
C 8 W
D None of the above

Answer: 4 W
35 The maximum a.c. power output from a class A power amplifier is 10 W. What should be the minimum power rating of the transistor used ?
A 10 W
B 15 W
C 5 W
D 20 W

Answer: 20 W
36 The output signal voltage and current of a power amplifier are 5V and 200 mA; the values being r.m.s. What is the power output?
A 1 W
B 2 W
C 4 W
D None of the above

Answer: 1 W
37 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?
A 20%
B 80%
C 40%
D 50%

Answer: 40%
38 When no signal is applied, the approximate collector efficiency of class A power amplifier is …….
A 10%
B 0%
C 25%
D 50%

Answer: 0%
39 If the power rating of a transistor is 1W and collector current is 100mA, then maximum allowable collector voltage is ………..
A 1V
B 100V
C 20V
D 10V

Answer: 10V
40 The driver stage usually employs………….
A Class A power amplifier
B Push-pull amplifier
C Class C amplifier
D None of the above

Answer: Class A power amplifier

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