Exercise: Analog Electronics

Questions for: Analog Electronics

An op-amp has zero gain for common mode inputs. Then CMRR =
A:
zero
B:
infinite
C:
high
D:
low
Answer: B

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

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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

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: B

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

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The value of parameter re used in re transistor model
A:
increases with increase in temperature
B:
decreases with increase in temperature
C:
is not affected by increase in temperature
D:
either (b) or (c)
Answer: A

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A transistor has two p-n junctions. The batteries should be connected such that
A:
both junctions are forward biased
B:
both junctions are reverse biased
C:
one junction is forward biased and the other is reverse biased
D:
either (a) or (b)
Answer: C

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

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In the diode circuit of figure the diodes are ideal. The average current through ammeter is
A:
B:
C:
D:
Answer: B

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