MCQ on Analog Electronics with Answers - 8

 

Multiple Choice Questions with Answers on Analog Electronics Circuits - Class B Amplifier - 2

1. The output of a class B amplifier for sinusoidal input is

a.      Full Sinusoidal

b.     Half-sinusoidal

c.      Sinusoidal with higher frequency

d.     Square wave

Answer: b

 

2. Compared to a single ended amplifier, a pushpull amplifier offers

a.      less distortion and less output power

b.     less distortion and more output power

c.      more distortion and less output power

d.     more distortion and more output power

Answer: b

 

3. Full sinusoidal output out of a class B amplifier can be obtained by

a.      By using non-sinusoidal inputs

b.     By utilizing two transistors

c.      By biasing it in the active region

d.     By adding a capacitor to the output

Answer: b

 

4. In a Class B amplifier, the maximum output power Pmax equals

a.      V²_CC/R_L

b.     V²_CC/2R_L

c.      V²_CC/2(R_L)^1/2

d.     V_CC/2R_L

Answer: b

 

5.  In a class B amplifier, if DC power is 25W,  the ac power would be

a.      10 W

b.     62.5 W

c.      25 W

d.     50 W

Answer: b

 

6. Crossover distortion takes place in

a.      tunned amplifiers

b.     power amplifiers

c.      small signal amplifiers

d.     video amplifiers

Answer: b

 

7.  The maximum efficiency of class B amplifier can be achieved

a.      When V_MAX = V_CC

b.     When two transistors are used

c.      When V_MIN = 0

d.     Efficiency is always constant

Answer: c

 

8.  The disadvantage of a class B push-pull amplifier is

a.      The efficiency reduces

b.     The figure of merit increases

c.      The cross-over distortion occurs

d.     The Q-power dissipation is very large

Answer: c

 

9. Which of the following amplifier operations causes maximum distortion?

a.      Class A

b.     Class B

c.      Class C

d.     Class AB

Answer: c

 

10. Read statements and select the correct option below.

A: A push-pull amplifier decreases harmonic distortion

B: Output has half-wave symmetry

a.      A and B are both correct and B is the correct reason for A

b.     A is correct and B is incorrect

c.      Both A and B are correct but B is not the correct reason for A

d.     Both A and B are incorrect

Answer: c

 

Hope this post on "MCQ on Analog Electronics with Answers-8" will help Electronics Engineering and Electrical Engineering students in preparation of technical interviews, GATE, IES etc.