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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