Electronics and Communication Engineering - Analog Electronics

36. 

If the value of C2 and C3 are doubled, the oscillation frequency will be

A. quadrupled
B. doubled
C. unchanged
D. halved

Answer: Option C

Explanation:

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37. 

Which of the following statement about JFET is correct?

A. In an N-channel JFET, the channel is the narrowest under zero gate bias condition
B. In a JFET the gates are always forward biased
C. In a JFET, gate-source cut off voltage is numerically equal to the pinch off voltage
D. It is a voltage controlled device

Answer: Option C

Explanation:

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38. 

Assertion (A): In Darlington pair, the overall β is product of individual βs

Reason (R): The voltage gain of a base driven amplifier is equal to ac collector voltage divided by ac base voltage

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 B

Explanation:

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39. 

A Wien bridge oscillator uses Wien bridge for

A. tuning and phase shift
B. tuning
C. phase shift
D. either tuning or phase shift

Answer: Option A

Explanation:

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40. 

A cascade amplifier will have higher cut off frequency

A. equal to that of single stage amplifier
B. less than that of single stage amplifier
C. more than that of single stage amplifier
D. none of these

Answer: Option B

Explanation:

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