Electrical Engineering MCQs

Page No. 22

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


aSaturation point

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bCut off point

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cOperating point

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dNone of the above

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View Answer Operating point

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


a20 kΩ

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b2 kΩ

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c10 kΩ

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d5 kΩ

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View Answer 5 kΩ

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


a1:1 ratio

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b Step-up

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cStep-down

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dNone of the above

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View Answer Step-down

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


aBurning of transistor

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bHum in the circuit

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cExcessive forward voltage

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d None of the above

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View Answer Hum in the circuit

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


aAmplitude

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b Intermodulation

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cFrequency

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dNone of the above

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View Answer Frequency

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


a1V

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b100V

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c20V

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d10V

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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%

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b80%

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c40%

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d50%

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View Answer 40%

The driver stage usually employs_________________?


aClass A power amplifier

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bPush-pull amplifier

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cClass C amplifier

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dNone of the above

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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

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b2 W

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c4 W

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dNone of the above

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View Answer 1 W

The push-pull circuit must use ______________ operation?


aClass A

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bClass C

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cClass B

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dClass AB

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View Answer Class B

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