# Different Types of Multivibrators – 1 MCQ’s

This set of Analog Electronic Circuits Multiple Choice Questions & Answers (MCQs) focuses on “Different Types of Multivibrators – 1″.

1. Given the circuit below, find the feedback factor.

a) 3
b) 1/3
c) 4
d) 1/4

2. In an astable multivibrator using an op-amp, the feedback factor is 0.5 and the supply voltage is ±12V. What are the quasi-stable output state and the input to the non-inverting terminal?
a) Quasi-stable output = ±12V, Input to non inverting terminal = ±12V
b) Quasi-stable output = ±6V, Input to non inverting terminal = ±12V
c) Quasi-stable output = ±12V, Input to non inverting terminal = ±6V
d) Quasi-stable output = ±12V, Input to non inverting terminal = 0V

3. What is a square wave generator?
a) Flip-flop
b) Bi-stable multivibrator
c) Astable multivibrator
d) Monostable multivibrator

4. What is the duty cycle of the output of an astable multivibrator?
a) 50%
b) 100%
c) 75%
d) 55%

5. Consider the following circuit and find the time period of the output of the multivibrator.

a) 0.436 ms
b) 0.436 seconds
c) .5 ms
d) 5.22 seconds

6. Given that the feedback factor is 0.6, find the time period of the circuit below.

a) 0.331 seconds
b) 0.303 seconds
c) 0.276 seconds
d) 0.606 seconds

7. Given that the feedback factor of an astable multivibrator is 0.3, find the frequency of the output.

a) 22Hz
b) 20kHz
c) 20Hz
d) 40Hz

8. How can the duty cycle be changed for an astable multivibrator?
a) By adding another capacitor to the circuit
b) By adding diodes to the circuit
c) By adding an inductor to the circuit
d) The duty cycle cannot be changed

9. The monostable multivibrator has one quasi-stable state and one unknown state.
a) True
b) False

10. Which of these is not a type of monostable multivibrator?
a) Schmitt trigger as a monostable multivibrator
b) Emitter coupled monostable multivibrator
c) Using an op-amp
d) 555 Timer as a monostable multivibrator

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