Electronics and Communication Engineering - Analog Electronics

1. 

A full wave rectifier circuit using centre tapped transformer and a bridge rectifier are fed at 100 V, 50 Hz. The frequencies of outputs in these two rectifiers are

A. 100 Hz each
B. 50 Hz each
C. 100 Hz and 50 Hz
D. 50 Hz and 100 Hz

Answer: Option A

Explanation:

Output wave in each case has two cycles for one cycle of input wave.


2. 

When the ac base voltage in a CE amplifier circuit is too high, the ac emitter current is

A. zero
B. constant
C. alternating
D. distorted

Answer: Option D

Explanation:

A high signal causes distortion because v-i characteristics of BJT is non-linear.


3. 

When load is coupled to class A amplifier through transformer, efficiency decreases.

A. True
B. False

Answer: Option B

Explanation:

Transformer coupling increases efficiency.


4. 

The gain of an FET amplifier can be changed by changing

A. rm
B. gm
C. Rd
D. none of the above

Answer: Option B

Explanation:

Gain is proportional to gm .


5. 

The open loop gain of an actual op-amp is about 100.

A. True
B. False

Answer: Option B

Explanation:

It is very high.


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