This set of Instrumentation Transducers Multiple Choice Questions & Answers (MCQs) focuses on “Comparators”.
1. Which of the following device is similar to analog comparator?
a) Analog switch
b) MCB
c) Energy meter
d) Digital switch
View Answer
Explanation: Analog comparators are similar to analog switch which switches comparing to a predetermined level.
2. Which of the following can act as a comparator?
a) Op-amp with negative feedback
b) Op-amp with positive feedback
c) Op-amp without feedback
d) None of the mentioned
View Answer
Explanation: Operational amplifier without feedback will act as comparator comparing two input signals.
3. Zero crossing detector has ____________ as reference voltage.
a) +ve Vcc
b) –ve Vcc
c) Zero V
d) 5V
View Answer
Explanation: Zero crossing detector compares given signal with zero reference value.
4. Which of the following detect the presence of a voltage between two voltages?
a) Zero crossing detector
b) Differential comparator
c) Window comparator
d) None of the mentioned
View Answer
Explanation: Window comparators are used to detect the presence of a given voltage value between two voltages.
5. Which of the following are used in window comparators?
a) Op-amps and AND gates
b) OP-amps and OR gates
c) Op-amps and XOR gates
d) OP-amps and NAND gates
View Answer
Explanation: Circuit of window comparator contains two op-amps and one AND gate.
6. Schmitt trigger is a sine wave generator.
a) True
b) False
View Answer
Explanation: Schmitt trigger is a comparator which produces square wave output.
7. Difference between levels on input that causes transition in Schmitt trigger is ___________
a) Hysteresis
b) Threshold
c) Cut-off value
d) Peak value
View Answer
Explanation: Hysteresis is the difference between input levels that causes output transition.
8. Threshold voltage for switching in Schmitt trigger is determined by _______________
a) Resistor R1
b) Resistor R2
c) Both resistors
d) None of the mentioned
View Answer
Explanation: Threshold voltage for switching is determined by both resistors R1and R2.
9. Which of the following is converted to square wave in Schmitt trigger?
a) Sine wave
b) Triangular wave
c) Pulse wave
d) All of the mentioned
View Answer
Explanation: Schmitt trigger converts any wave into a square wave.
10. For a particular op-amp hysteresis is governed by _______________
a) Resistor R1
b) Resistor R2
c) Both resistors R1 and R2
d) Op-amp parameters
View Answer
Explanation: Hysteresis of a particular op-amp is governed by resistors R1 and R2.
Sanfoundry Global Education & Learning Series – Instrumentation Transducers.
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