Exercise: Analog Electronics

Questions for: Analog Electronics

In all base driver amplifiers
A:
ac collector voltage is 180Ā° out of phase with ac base voltage
B:
ac emitter voltage is 180Ā° out of phase with ac base voltage
C:
ac collector voltage is in phase with ac base voltage
D:
none of the above
Answer: A
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Assertion (A): A good op-amp should have very large band width

Reason (R): An ideal op-amp should have infinite input resistance and zero output resistance

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: A
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The signal input to a given amplifier is made up of 100 mĪ© signal power and 1 mĪ© noise power. The amplifier contributes an additional 100 mĪ© of noise and has a power gain of 20 dB. The input signal-to noise ratio is
A:
2
B:
10
C:
20
D:
100
Answer: D
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In the equivalent circuit of figure voltage gain is
A:
a
B:
C:
D:
Answer: C
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When a transistor is connected in common emitter mode, it with have
A:
negligible input resistance and high output resistance
B:
high input resistance and low output resistance
C:
medium input resistance and high output resistance
D:
low input resistance as well as output resistance
Answer: C
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