Related Questions

When negative voltage feedback is applied to an amplifier, its voltage gain ___________
A Is increased
B Is reduced
C Remains the same
D None of the above
The graph of current gain versus collector current indicates that the current gain
A varies enormously
B is contant
C varies slightly
D equals the collector current divided by the base current
E None of the above
When drain voltage equals the pinch-off-voltage, then drain current ___________ with the increase in drain voltage
A decreases
B increases
C remains constant
D none of the above
A class A power amplifier is sometimes called ___________ amplifier
A Symmetrical
B Single-ended
C Reciprocating
D Differential
If in a synchronous motor, driving mechanical load and drawing current at lagging power factor from constant voltage supply, its field excitation is increased, then its power factor
A become more
B become less
C remain constant
D none of the above
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
If a transistor amplifier feeds a load of low resistance (e.g. speaker), then voltage gain will be ___________
A High
B Very high
C Moderate
D Low
If in a synchronous motor, driving a given mechanical load and drawing current at a leading power factor from constant voltage supply its field excitation is increased, its power factor
A will become more
B will become less
C will remain unchanged
D none of the above.
For a plate-modulated class C amplifier the plate supply voltage is E. The maximum plate cathode voltage could be almost high as
A 2E
B 3E
C 4E
D 6E
The voltage regulation in magnetic amplifier type voltage regulator is effected by
A Electromagnetic induction
B Varying the resistance
C Varying the reactance
D Variable transformer

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