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Electronics and Communication Engineering - Analog Electronics

Exercise : Analog Electronics - Section 2
26.
A transistor has two p-n junctions. The batteries should be connected such that
both junctions are forward biased
both junctions are reverse biased
one junction is forward biased and the other is reverse biased
either (a) or (b)
Answer: Option
Explanation:

Emitter base junction is forward biased and base-collector junction is reverse biased.

27.
The value of parameter re used in re transistor model
increases with increase in temperature
decreases with increase in temperature
is not affected by increase in temperature
either (b) or (c)
Answer: Option
Explanation:

.

28.

Assertion (A): In a full wave rectifier output the lowest ac component is at twice the input frequency

Reason (R): In a full wave rectifier, the output waveform consists of half sinusoids

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:

Since output consists of half sinusoids, output frequency is twice the input frequency.

29.
An op-amp has zero gain for common mode inputs. Then CMRR =
zero
infinite
high
low
Answer: Option
Explanation:

Since common mode signal is reduced to zero, CMRR is infinite.

30.

Assertion (A): Negative feedback reduces the bandwidth of an amplifier

Reason (R): Negative feedback stabilizes the gain of an amplifier

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:

A is wrong because negative feedback increases the bandwidth.

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