Related Questions

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
A single phase transformer has a maximum efficiency of 90% at full load and unity power factor. Efficiency at half load at the same power factor is -
A 87.8%
B 86.7%
C 88.26%
D 88.9%
A class A power amplifier is sometimes called ___________ amplifier
A Symmetrical
B Single-ended
C Reciprocating
D Differential
The maximum efficiency of resistance loaded class A power amplifier is
A 5%
B 50%
C 30%
D 25%
In an RC coupled amplifier, the voltage gain over mid-frequency range ___________
A Changes abruptly with frequency
B Is constant
C Changes uniformly with frequency
D None of the above
When no signal is applied, the approximate collector efficiency of class A power amplifier is
A 10%
B 0%
C 25%
D 50%
Class C power amplifier has the highest collector efficiency
A C
B A
C B
D AB
The output power of a transistor amplifier is more than the input power because the additional power is supplied by ___________
A Transistor
B Biasing circuit
C Collector supply VCC
D None of the above
Power amplifiers generally use transformer coupling because transformer per-mits
A Cooling of the circuit
B Impedance matching
C Distortionless output
D Good frequency response
Low efficiency of a power amplifier results in ___________
A Low forward bias
B Less battery consumption
C More battery consumption
D None of the above

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