Electrical Engineering Practice Impotent Questions Part 2

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26-A Common emitter amplifier has a voltage gain of 50, an input impedance of 100 Ohm and an output impedance of 200 Ohms. The power gain of the amplifier is:

A.

B.

C.

D.

E.

Ans: A.

27-The characteristics of a thyristor closely resemble to the characteristics of:

A. PN-junction

B. Constant Voltage Source

C. Constant current source

D. Thyratron gas tube

Ans: A. PN-junction

28-What is the advantage of class A operation of an amplifier

A. High gain

B. Less distortion

C. High efficiency

D. High Adeptness

Ans: B. Less distortion

29-Which of the following is an active device?

A. Electric Bulb

B. Transformer

C. SCR

D. Loudspeaker

Ans:

30-A tangent galvanometer is:

A. An absolute instrument

B. A secondary instrument

C. A recording instrument

D. An integrating instrument

Ans: A. An absolute instrument

31-AnN-type crystal is:

A. Neutral

B. Negatively charged

C. Positively charged

D. Insufficient information

Ans: A. Neutral

32-A device which converts mechanical energy into electrical energy is called:

A. Electric generator

B. Transformer

C. Mechanical device

D. Amplifier

Ans: A. Electric generator

33-The Internal voltage drop in case of Silicon diode is around:

A. 2 to 5 volts

B. 0.6 to 0.7 volts

C. 5 to 10 volts

D. 10 to 20 volts

Ans: B. 0.6 to 0.7 volts

34-The rotating part of a DC generator is known as:

A. Pole

B. Stator

C. Commutator

D. Armature

Ans: D. Armature

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