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Electronics and Communication Engineering - Analog Electronics

Exercise : Analog Electronics - Section 5
1.
A CB amplifier has a = 0.98 and RL = 600 Ω. If IE = 3.5 mA, the current gain is
1
0.98
0.98 x 3.5
Answer: Option
Explanation:

Current gain of CB amplifier is a.

2.
funity of an op-amp is about 1 kHz.
True
False
Answer: Option
Explanation:

It is about 1 MHz.

3.

Assertion (A): In an RC coupled amplifier the junction capacitances can be neglected at low frequencies but not at high frequencies

Reason (R): Capacitive reactance is inversely proportional to frequency.

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:

At high frequencies XC is very small.

4.
In figure, D1 turns on when
vi is more than V1
vi is less than V1
vi is between V1 and V2
none of the above
Answer: Option
Explanation:

D1 is forward biased when vi > V1.

5.
In a full wave rectifier circuit using centre tapped transformer, the peak voltage across half of the secondary winding is 30 V. Then PIV is
30 V
60 V
15 V
10 V
Answer: Option
Explanation:

In full wave circuit using centre tapped transformer PIV = 2Vm .

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