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Electronics and Communication Engineering - Analog Electronics

Exercise : Analog Electronics - Section 21
11.
The signal input to a given amplifier is made up of 100 mΩ signal power and 1 mΩ noise power. The amplifier contributes an additional 100 mΩ of noise and has a power gain of 20 dB. The input signal-to noise ratio is
2
10
20
100
Answer: Option
Explanation:
No answer description is available. Let's discuss.
12.

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

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:
No answer description is available. Let's discuss.
13.
In all base driver amplifiers
ac collector voltage is 180° out of phase with ac base voltage
ac emitter voltage is 180° out of phase with ac base voltage
ac collector voltage is in phase with ac base voltage
none of the above
Answer: Option
Explanation:
No answer description is available. Let's discuss.
14.
The horizontal intercept of dc load line is the same as ideal
cut off point
saturation point
operating point
quasi saturation point
Answer: Option
Explanation:
No answer description is available. Let's discuss.
15.
Figure represents a
NPN transistor
PNP transistor
Zener diode
Power diode
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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