Triangular Wave Generator Using Op-Amp MCQ [Free PDF] – Objective Question Answer for Triangular Wave Generator Using Op-Amp Quiz

11. How the op-amp comparator should be chosen to get the higher speed of operation?

A. Large gain
B. High slew rate
C. Wider bandwidth
D. None of the mentioned

Answer: C

The bandwidth of the op-amp comparator must be wider so that the output of the comparator can switch rapidly between saturation levels. Also, the op-amp responds instantly to any change in condition at the input.

 

12. How to obtain a high rate of accuracy in a comparator?

A. Input offset
B. High voltage gain
C. High CMRR
D. All of the mentioned

Answer: D

High voltage gain causes the comparator output voltage to switch between saturation levels. High CMRR rejects noise at the input terminal and input offset (voltage & current) helps to keep changes in temperature variation very slight.

 

13. 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

Answer: B

To keep the output voltage swing within the specific limit, op-amps are used with external wired components such as zeners or diodes. In the resulting circuit, the outputs are limited to predetermined values.

 

14. Zero crossing detectors are also called as

A. Square to the sine wave generator
B. Sine to the square wave generator
C. Sine to the triangular wave generator
D. All of the mentioned

Answer: B

In zero-crossing detectors, the output waveform is always a square wave for the applied sinusoidal input signal.

 

15. What is the drawback of zero-crossing detectors?

A. Low-frequency signal and noise at an 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 an output terminal

Answer: C

Due to the low-frequency signal, the output voltage may not switch quickly from one saturation voltage to another. The presence of noise can fluctuate the output between two saturation voltages.

 

16. 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

Answer: B

The drawback of zero-crossing detectors can be cured with the use of regenerative or positive feedback that causes the output to change faster and eliminate any false output transition due to noise signals at the input.

 

17. Name the comparator that helps to find unknown input.

A. Time marker generator
B. Zero crossing detectors
C. Phase meter
D. Window detector

Answer: D

Sometimes it is necessary to find the instant at which an unknown input is between two threshold levels. This can be achieved by a circuit called a window detector.

 

18. Mention the application areas of the time marker generator that can be used

A. Monoshots
B. SCR
C. Sweep voltage of CRT
D. All of the mentioned

Answer: D

A diode connected to the output of the time marker generator circuit converts the sinusoidal signal into a train of positive pulses. So, these pulses are used in triggering the moonshot, SCR, sweep voltage of CRT, etc.

 

19. 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

Answer: A

The phase angle between different voltages can be measured using a phase detector circuit. The corresponding voltage to be measured is converted into spikes and the time interval between the pulse spikes is measured, which is proportional to the phase difference.

 

20. Which circuit converts irregularly shaped waveforms to regular shaped waveforms?

A. Schmitt trigger
B. Voltage limiter
C. Comparator
D. None of the mentioned

Answer: A

Schmitt triggers are also called squaring circuits because this type of circuit converts an irregularly shaped wave to a square wave or pulse.

 

21. Determine the upper and lower threshold voltage

Determine the upper and lower threshold voltage

A. VUT = +14.63v, VLT= +14.63v
B. VUT = -14.63v, VLT= -14.63v
C. VUT = VLT= ±14.63v
D. None of the mentioned

Answer: B

Upper threshold voltage

VUT = [R1/(R1+ R2)]× (+Vsat)

= [10kΩ/(10kΩ +250Ω)]×(+15v)= +14.63v.

Lower threshold voltage

VLT = [R1/(R1+ R2)]×( -Vsat)

= [10kΩ /(10kΩ+250Ω)]×(-15v)= -14.63v.

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