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
Transistor Audio Power Amplifiers
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 ?
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
Power amplifiers generally use transformer coupling because transformer permits______________?
Power amplifiers generally use transformer coupling because transformer permits______________?
A. Cooling of the circuit
B. Impedance matching
C. Distortionless output
D. Good frequency response
The most important consideration in power amplifier is __________________?
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
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 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
Transformer coupling can be used in______________amplifiers?
Transformer coupling can be used in______________amplifiers?
A. Either power or voltage
B. Only power
C. Only voltage
D. None of the above
An AF amplifier is shielded to ________________?
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
The disadvantage of impedance matching is that it _______________?
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
The most costly coupling is _______________ coupling?
The most costly coupling is _______________ coupling?
A. RC
B. Direct
C. Impedance
D. Transformer
Class C amplifiers are used as ___________________?
Class C amplifiers are used as ___________________?
A. AF amplifiers
B. Detectors
A. amplifiers
C. None of the above