Analog Circuits Questions and Answers – Different Types of Multivibrators – 2

This set of Analog Circuits Multiple Choice Questions & Answers (MCQs) focuses on “Different Types of Multivibrators – 2”.

1. Given the following circuit.

The supply voltage being applied is ±15V. The diode cut-in voltage is 0.7V. Find the maximum value of R such that circuit can behave as a monostable multivibrator.
a) 612.8kΩ
b) 33kΩ
c) 220.22kΩ
d) 450.8kΩ
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2. For the given circuit, find the time period of the output waveform, given that the diode is used is of Silicon and the supply voltage being applied is ±15V. The feedback factor is 0.4.

a) 11.12 ms
b) 12.4 ms
c) 11.2 seconds
d) 5.6 ms
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3. Find the approximate frequency of output waveform of a monostable multivibrator given that RC = 20×10^-3 and feedback factor = 0.3.
a) 200Hz
b) 142Hz
c) 233Hz
d) Can’t be found out without supply voltage value
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4. Consider the circuit shown below.

R1=5kΩ, R2=5kΩ, R3=5kΩ, R4=10kΩ, R5=20kΩ, C1=10μF. Calculate the total charging time and discharging time.
a) The charging time = 0.2 seconds, the is charging time is 0.2 seconds
b) The charging time = 0.3 seconds, the discharging time is 0.2 seconds
c) The charging time = 0.3 seconds, the discharging time is 0.3 seconds
d) The charging time = 0.5 seconds, the discharging time is 0.4 seconds
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5. For the given circuit, find the duty cycle of the output.

R4=30kΩ, R5=25kΩ.
a) 0.6875
b) 0.7211
c) 0.5681
d) 0.5010
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6. What is the output frequency for the following circuit?

R4=30kΩ, R5=40kΩ, C1=5nF.
a) 2.63 kHz
b) 3kHz
c) 263 kHz
d) 4.4 kHz
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7. In the astable multivibrator using IC 555, it can be used as a voltage to frequency converter.
a) True
b) False
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8. How can a monostable multivibrator using IC 555 be used as a PWM generator?
a) If a diode is connected across the resistor RA
b) If a modulating signal m(t) is applied at the control pin
c) If the control pin is always kept high
d) It cannot be used as a PWM generator ever
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9. Given that the charging current of capacitor is constant in a monostable multivibrator using IC 555, then find the type of output waveform, type of capacitor voltage waveform and the time period of output.
a) The capacitor waveform is a ramp, the output waveform is sinusoidal, the time period is \(\frac{2.C.VCC}{3.I}\)
b) The capacitor waveform is a ramp, the output waveform is a pulse, the time period is \(\frac{2.C.VCC}{3.I}\)
c) The capacitor waveform is a ramp, the output waveform is a pulse, the time period is \(\frac{C.VCC}{3.I}\)
d) The capacitor waveform is a ramp, the output waveform is a ramp, the time period is \(\frac{2.C.VCC}{3.I}\)
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