Electronics and Communication Engineering - Analog Electronics

31. 

Assertion (A): In class A amplifier the distortion is minimum

Reason (R): In class A amplifier collector current exists for 360° of input cycle

A. Both A and R are correct and R is correct explanation for A
B. Both A and R are correct but R is not correct explanation for A
C. A is correct R is wrong
D. A is wrong R is correct

Answer: Option A

Explanation:

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32. 

Assertion (A): In a differential amplifier the current through common emitter resistor is called tail current

Reason (R): CMRR of an op-amp indicates how a differential signal amplified

A. Both A and R are correct and R is correct explanation for A
B. Both A and R are correct but R is not correct explanation for A
C. A is correct R is wrong
D. A is wrong R is correct

Answer: Option C

Explanation:

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33. 

Quartz crystal has

A. very small Q
B. small Q
C. very high Q
D. Q less than 1

Answer: Option C

Explanation:

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34. 

The current ICBO

A. increases with increases in temperature
B. is normally greater for silicon transistor than germanium transistors
C. mainly depends on the emitter base junction bias
D. depends largely on the emitter doping

Answer: Option A

Explanation:

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35. 

Assertion (A): In a push pull circuit each transistor stays in the active region for one half cycle

Reason (R): A push pull amplifier has low distortion

A. Both A and R are correct and R is correct explanation for A
B. Both A and R are correct but R is not correct explanation for A
C. A is correct R is wrong
D. A is wrong R is correct

Answer: Option A

Explanation:

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