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Electronics and Communication Engineering - Analog Electronics

Exercise : Analog Electronics - Section 1
21.
In the amplifier circuit of figure hfe = 100 and hie = 1000 Ω. The voltage gain of amplifier is about
0.33
0.5
0.66
1
Answer: Option
Explanation:

.

22.
The efficiency of a full wave rectifier using centre tapped transformer is twice that in full wave bridge rectifier.
True
False
Answer: Option
Explanation:

Efficiency of full wave rectifier with centre tapped transformer is slightly higher than that of bridge rectifier.

23.

Assertion (A): CE amplifier is the most widely used BJT amplifier

Reason (R): CE amplifier has zero phase difference between input and output

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:

There is 180° phase difference between input and output.

24.

Assertion (A): For large signal variations an amplifier circuit has to be analysed graphically

Reason (R): The output characteristics of a transistor is nonlinear.

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 the characteristics is non-linear, graphical analysis is needed.

25.
Negative feedback reduces noise originating at the amplifier input.
True
False
Answer: Option
Explanation:

It has no effect on noise originating at amplifier input.

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