Class B Amplifiers MCQ’s

This set of Electronic Devices & Circuits Multiple Choice Questions & Answers (MCQs) focuses on “Class B Amplifiers”.

1. Class B amplifier Produces output even if the input is zero.
a) True
b) False

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

3. Where does the Q point lie for class B amplifier?
a) Active
b) Cut off
c) Saturation
d) Between saturation and active

4. 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%

5. What kind of design is used to avoid transformer usage?
a) High resistance
b) Matched load
c) Complementary symmetry
d) Capacitive Model

6. 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

7. Which is the main disadvantage of class B amplifiers?
a) Expensive
b) Less efficient
c) More power dissipation
d) More heat dissipation

8. 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

9. 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%

10. What is the conduction angle for Class B push-pull amplifier?
a) 0
b) 90
c) 180
d) 270

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