Comparator MCQ’s

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This set of Signals & Systems Multiple Choice Questions & Answers (MCQs) focuses on “Comparator”.

1. Why clamp diodes are used in comparator?
a) To reduce output offset voltage
b) To increase gain of op-amp
c) To reduce input offset current
d) To protect op-amp from damage

2. Find the non-inverting comparator
a)
Find non-inverting comparator from the given diagram
b)
Find voltage Vref of 1v from the given diagram
c)
Find positive inverting input terminal from the given diagram
d)
Find non-inverting input terminal of op-amp from the given diagram

3. Depending on the value of input and reference voltage a comparator can be named as
a) Voltage follower
b) Digital to analog converter
c) Schmitt trigger
d) Voltage level detector

4. How the op-amp comparator should be choosen to get higher speed of operation?
a) Large gain
b) High slew rate
c) Wider bandwidth
d) None of the mentioned

5. How to keep the output voltage swing of the op-amp comparator within specific limits?
a) External resistors or diodes are used
b) External zeners or diodes are used
c) External capacitors or diodes are used
d) External inductors or diodes are used

6. What is the drawback in zero crossing detectors?
a) Low frequency signal and noise at output terminal
b) High frequency signal and noise at input terminal
c) Low frequency signal and noise at input terminal
d) High frequency signal and noise at output terminal

7. How to obtain high rate of accuracy in comparator?
a) Input offset
b) High voltage gain
c) High CMRR
d) All of the mentioned

8. Zero crossing detectors is also called as
a) Square to sine wave generator
b) Sine to square wave generator
c) Sine to triangular wave generator
d) All of the mentioned

9. State a method to overcome the drawback of zero crossing detectors?
a) Increasing input voltage
b) Use of positive feedback
c) Connect a compensating network
d) None of the mentioned

10. Find the instance at which the input can be fed to the op-amp in a three level comparator with LED indicator.

Find the instance at which the input can be fed to the op-amp with LED indicator

a) When Green LED glow
b) When Yellow LED glow
c) When Red LED glow
d) All of the mentioned

11. Mention the application areas of time marker generator can be used
a) Monoshots
b) SCR
c) Sweep voltage of CRT
d) All of the mentioned

12. Name the comparator that helps to find unknown input.
a) Time marker generator
b) Zero crossing detectors
c) Phase meter
d) Window detector

13. Find the output voltage at the point V2 from the given circuit.

Find the output voltage at the point V2 from the given circuit

a)
Find output of the zero crossing detector from the given diagram
b)
Find RC circuit from the given diagram
c)
Find voltage at V2 from the given diagram
d)
Find the series of negative pulses from the given diagram

14. Which among the following is used to increase phase angle between different voltages?
a) Phase detector
b) Window detector
c) Zero crossing detector
d) None of the mentioned

15. For the comparator shown below, determine the transfer curves if an ideal op-amp with VZ1= VZ2=9v.

Determine the transfer curves if an ideal op-amp is given with VZ1 = VZ2=9V

a)
Transfer curves of an ideal op-amp with VZ1= VZ2=9v
b)
Find the open loop voltage gain of an ideal op-amp comparator
c)
Find the small positive or negative voltage at the input drives of ideal op-amp
d)
Find the open loop voltage gain transfer curve of an ideal op-amp from the given comparator

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