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Electronics and Communication Engineering - Analog Electronics

Exercise : Analog Electronics - Section 3
41.
A circuit using an op-amp is shown in the given figure. It has
voltage series feedback
voltage shunt feedback
current shunt feedback
current series feedback
Answer: Option
Explanation:

From above mathematical expression

Feedback current If is proportional to V0. So it is a voltage shunt feedback.

42.

Assertion (A): In CE amplifier the emitter is at ground potential for ac signals

Reason (R): A CE amplifier has near unity voltage gain

Both A and R are correct and R is correct explanation for A
Both A and R are correct but R is not correct explanation for A
A is correct R is wrong
A is wrong R is correct
Answer: Option
Explanation:

CE amplifier has good voltage gain.

43.
An oscillator requires an amplifier
with negative feedback
with positive feedback
with either positive or negative feedback
none of the above
Answer: Option
Explanation:

Positive feedback is necessary for sustained oscillations.

44.
A full wave bridge diode rectifier uses diodes having forward resistance of 50 ohms each. The load resistance is also 50 ohms. The voltage regulations is
20%
50%
100%
200%
Answer: Option
Explanation:

No load output voltage =

Output voltage at full load =

45.
The disadvantage of direct coupled amplifiers is
drift
large size of transistor
low voltage gain
both (b) and (c)
Answer: Option
Explanation:

The drift is amplified by different stages.

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