MCQ on Analog Electronics with Answers - 7

 

Multiple Choice Questions with Answers on Analog Electronics Circuits - Class B Amplifier - 1

1. Where does the Q point lie for class B amplifier?

a.      Active

b.     Cut off

c.      Saturation

d.     Between saturation and active

Answer: b

 

2. What happens when class B amplifier is in a quiescent state?

a.      No current flows through the transistor

b.     Maximum current flows through the transistor

c.      Half of the maximum current flows through the transistor

d.     Quarter of the maximum current flows

Answer: a

 

3. What is the value of the maximum efficiency of the class B amplifier?

a.      25%

b.     35%

c.      35% to 50%

d.     50% to 70%

Answer: d

 

4. Which is the main disadvantage of class B amplifiers?

a.      Expensive

b.     Less efficient

c.      More power dissipation

d.     More heat dissipation

Answer: a

 

5. What kind of design is used to avoid transformer usage?

a.      High resistance

b.     Matched load

c.      Complementary symmetry

d.     Capacitive Model

Answer: c

 

6. What is cross over distortion?

a.      Effect occurred during switching of transistor after every half cycle

b.     Distortion occurred due to resistors

c.      Distortion occurred due to Capacitors

d.     Distortion occurred due to Inductors

Answer: a

 

7. How to avoid cross over distortion?

a.      By using more resistance

b.     By using more capacitance

c.      By using more Inductance

d.     By shifting the Q point above cut off

Answer: d

 

8. For a Class B amplifier, the utilized load power is 300W and the DC power is 500W, find efficiency.

a.      30%

b.     60%

c.      90%

d.     100%

Answer: b

 

9. What is the conduction angle for Class B push-pull amplifier?

a.      0°

b.     90°

c.      180°

d.     270°

Answer: c

 

10. Which of these is not true for a class B amplifier?

a.      It has zero DC bias

b.     They have an efficiency less than that of class A amplifiers

c.      The quiescent power dissipation is zero

d.     The conduction angle is only 180°

Answer: b

Hope this post on "MCQ on Analog Electronics with Answers-7" will help Electronics Engineering and Electrical Engineering students in preparation of technical interviews, GATE, IES etc.