1. A comparator is a circuit that:
(A) Amplifies the difference between two signals
(B) Compares two input voltages and produces a digital output
(C) Integrates the input signal
(D) Differentiates the input signal
2. The output of a comparator is usually:
(A) Analog
(B) Digital
(C) AC
(D) Triangular
3. A comparator operates mostly in the:
(A) Linear region
(B) Saturation region
(C) Active region
(D) Cut-off region
4. In an inverting comparator, the reference voltage is applied to the:
(A) Inverting input
(B) Non-inverting input
(C) Output terminal
(D) Ground terminal
5. In a non-inverting comparator, the reference voltage is applied to the:
(A) Inverting input
(B) Non-inverting input
(C) Output terminal
(D) Power terminal
6. The output of an ideal comparator is:
(A) Infinite
(B) Constant
(C) Either high or low
(D) Linear with input
7. The threshold voltage of a comparator is the voltage:
(A) At which output switches
(B) Always equal to zero
(C) Of the Op-Amp power supply
(D) That controls bias current
8. A comparator can be used to convert:
(A) Digital to analog signal
(B) Analog to digital signal
(C) DC to AC signal
(D) AC to DC signal
9. A comparator circuit with hysteresis is called a:
(A) Integrator
(B) Differentiator
(C) Schmitt Trigger
(D) Amplifier
10. Hysteresis in a Schmitt Trigger helps to:
(A) Reduce noise and false triggering
(B) Increase gain
(C) Decrease speed
(D) Increase offset voltage
11. A Schmitt Trigger is a type of:
(A) Differential amplifier
(B) Comparator with positive feedback
(C) Integrator with capacitor
(D) Low-pass filter
12. The two threshold voltages in a Schmitt Trigger are known as:
(A) High and low bias voltages
(B) Upper and lower trigger points
(C) Positive and negative peaks
(D) Supply limits
13. The region between upper and lower trigger voltages is called:
(A) Hysteresis band
(B) Gain region
(C) Feedback loop
(D) Dead zone
14. In a Schmitt Trigger, the output changes state only when:
(A) Input crosses a threshold voltage
(B) Input is zero
(C) Output reaches maximum
(D) Feedback is removed
15. A Schmitt Trigger converts a noisy analog input into a:
(A) Ramp output
(B) Smooth DC signal
(C) Clean digital pulse
(D) Sine wave
16. The feedback used in a Schmitt Trigger is:
(A) Negative feedback
(B) Positive feedback
(C) No feedback
(D) Capacitive feedback
17. The main application of a comparator is in:
(A) Signal amplification
(B) Signal comparison and threshold detection
(C) Current regulation
(D) Filtering
18. The main application of a Schmitt Trigger is in:
(A) DC amplification
(B) Wave shaping and noise elimination
(C) Power control
(D) Frequency modulation
19. The output of a Schmitt Trigger for a sinusoidal input is:
(A) Sine wave
(B) Square wave
(C) Ramp wave
(D) Triangular wave
20. In a comparator circuit, the speed of operation is limited by:
(A) Slew rate of the Op-Amp
(B) Feedback resistance
(C) Input offset voltage
(D) Power supply
21. A comparator is also known as a:
(A) Level detector
(B) Current amplifier
(C) Voltage follower
(D) Buffer amplifier
22. The output of a comparator saturates at approximately:
(A) Reference voltage
(B) ± supply voltage
(C) Ground potential
(D) Zero volts
23. A Schmitt Trigger can be used as a:
(A) Memory element
(B) Multivibrator
(C) Pulse generator
(D) All of the above
24. In a non-inverting Schmitt Trigger, the input is applied to:
(A) Inverting input terminal
(B) Non-inverting input terminal
(C) Output terminal
(D) Feedback network
25. The hysteresis width of a Schmitt Trigger depends on:
(A) Supply voltage and resistor ratio
(B) Input offset voltage
(C) Bias current
(D) Input capacitance
26. A zero-crossing detector is a type of:
(A) Integrator
(B) Differentiator
(C) Comparator
(D) Amplifier
27. The zero-crossing detector changes its output when:
(A) Input crosses zero volts
(B) Input reaches peak value
(C) Input equals output
(D) Input saturates
28. The output of a comparator without hysteresis can:
(A) Oscillate due to noise near threshold
(B) Remain stable at all times
(C) Never switch
(D) Always stay high
29. In a Schmitt Trigger, positive feedback causes:
(A) Hysteresis
(B) Stability
(C) Negative gain
(D) Phase shift
30. A Schmitt Trigger is preferred over a simple comparator when:
(A) Input is noisy or slowly varying
(B) Input is pure DC
(C) Input has no fluctuations
(D) Input is at high frequency only