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Electronics and Communication Engineering - Analog Electronics

Exercise : Analog Electronics - Section 7
26.
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 noise factor is
1
1.5
2.0
15
Answer: Option
Explanation:
No answer description is available. Let's discuss.
27.

Assertion (A): The gain of an FET amplifier can be changed by changing gm

Reason (R): Most receivers use automatic gain control to counteract changes in volume caused by fading

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.
28.
The element in the feedback circuit of a logarithmic amplifier using op-amp is
a resistor
a capacitor
an inductor
a diode
Answer: Option
Explanation:
No answer description is available. Let's discuss.
29.
In a FET, gm varies as
IDS
IDS2
1/IDS
IDS
Answer: Option
Explanation:
No answer description is available. Let's discuss.
30.

Assertion (A): Class A and Class B amplifier predominate in audio applications.

Reason (R): Class C amplifier is used at radio frequencies.

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.
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