Electrical Engineering MCQs

Page No. 22

The point of intersection of d.c. and a.c. load lines is called________________?


aSaturation point


bCut off point


cOperating point


dNone of the above


View Answer Operating point

If a transistor amplifier draws 2mA when input voltage is 10 V, then its input impedance is ____________?


a20 kΩ


b2 kΩ


c10 kΩ


d5 kΩ


View Answer 5 kΩ

The output transformer used in a power amplifier is a _____________ transformer?


a1:1 ratio


b Step-up


cStep-down


dNone of the above


View Answer Step-down

The pulsating d.c. applied to power amplifier causes________________?


aBurning of transistor


bHum in the circuit


cExcessive forward voltage


d None of the above


View Answer Hum in the circuit

If the gain versus frequency curve of a transistor amplifier is not flat, then there is distortion ?


aAmplitude


b Intermodulation


cFrequency


dNone of the above


View Answer Frequency

If the power rating of a transistor is 1W and collector current is 100mA, then maximum allowable collector voltage is________________?


a1V


b100V


c20V


d10V


View Answer 10V

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 ?


a20%


b80%


c40%


d50%


View Answer 40%

The driver stage usually employs_________________?


aClass A power amplifier


bPush-pull amplifier


cClass C amplifier


dNone of the above



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 ?


a1 W


b2 W


c4 W


dNone of the above


View Answer 1 W

The push-pull circuit must use ______________ operation?


aClass A


bClass C


cClass B


dClass AB


View Answer Class B

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