# Electronics and Communication Engineering - Analog Electronics

36.

In a practical oscillator, the magnitude of loop gain Aβ is kept slightly larger than unity and the amplitude of oscillations is limited by

 A. the ratio of A to β B. the on set of non-linearity of amplifying device C. the linearity of amplifying device D. all of the above

Answer: Option B

Explanation:

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37.

Assertion (A): Direct coupled amplifiers are rarely used

Reason (R): Direct coupled amplifiers suffer from the disadvantage of drift

 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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38.

A multistage amplifier has a low pass response with three real poles at s = - w1 - w2 and w3. The approximate overall bandwidth B of the amplifier will be given by

 A. B = w1 + w2 + w3 B. C. B = (w1 + w2 + w3)1/3 D. B = w12 + w22 + w32

Answer: Option A

Explanation:

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39.

In a feedback series regular circuit, the output voltage is regulated by controlling the

 A. magnitude of the I/P voltage B. gain of the feed back BJT C. reference Voltage D. voltage drop across the series pass transistor

Answer: Option D

Explanation:

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40.

The transformer cores operating at microwave frequency ranges are generally made up of

 A. silicon steel B. ferrites C. albino D. super alloy

Answer: Option B

Explanation:

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