Power Electronics MCQ 2023: We have shared 30 most important power electronic MCQ ( multiple choice questions)/ Power Electronics MCQ questions with answer PDF format are given below. Students who are preparing for entrance examination, competitive examination, interviews, college tests kindly use these MCQ on power electronics questions. These power electronics questions is cover theoretical concepts only remaining will be updated soon. Electrical engineering student is mostly studied by power electronic subject.
Table of Contents
1. Overview – Power Electronics MCQ 2023
| Article Name | Power Electronics |
| Number of Questions | 30 |
| Category | GK Quiz |
2. Power Electronics MCQ 2023
1. A diac has ________ semiconductor layers.
1. three
2. two
3. five
4. four
Answer: Three
2. The triac is _______
1. Like a unidirectional SCR
2. Like a bidirectional SCR
3. Not a thyristor
4. A four-terminal device
Answer: Like a bidirectional SCR
3. After peak point, the UJT operates in the _____ region.
1. Saturation
2. Cut-off
3. Negative resistance
4. None of the above
Answer: Negative resistance
4. The diac has____ pn junctions
1. four
2. three
3. two
4. one
Answer: Two
5. In a three phase (50 Hz) full converter, the ripple frequency in output voltage?
1. 50 Hz
2. 300 Hz
3. 350 Hz
4. 100 Hz
Answer: 300 Hz
6. A silicon controlled rectifier (SCR) is a________
1. Device with three junction
2. Unijunction device
3. Device with four junction
4. None of the above
Answer: Device with three junction
7. Which semiconductor power device is not a current triggering device?
1. Thyristor
2. Triac
3. MOSFET
4. G.T.O
Answer: MOSFET
8. A thyristor equivalent of a thyratron tube is a ______
1. Diac
2. Silicon controller rectifier
3. Triac
4. None of the above
Answer: Silicon controlled rectifier
9. A triac is a_______
1. One terminal unidirectional switch
2. four terminal bidirectional switch
3. three terminal bidirectional switch
4. None of the above
Answer: three terminal bidirectional switch
10. A UJT has______
1. One pn junction
2. Two pn junctions
3. Three pn junctions
4. None of the above
Answer: one pn junction
11. A triac can pass a portion of ______ half-cycle through the load.
1. Only negative
2. Both positive and negative
3. Only positive
4. None of the above
Answer: Both positive and negative
12. The normal way to turn on diac is by_____
1. Gate voltage
2. Gate current
3. Breakover voltage
4. None of the above
Answer: Breakover voltage
13. The UJT may be used as______
1. A sawtooth generator
2. A rectifier
3. Am amplifier
4. None of the above
Answer: A sawtooth generator
14. A diac has ________ terminals.
1. three
2. four
3. two
4. one
Answer: Two
15. A UJT is sometime called __________ diode
1. Low resistance
2. Double-base
3. Single-base
4. High resistance
Answer: Double-base
16. When the temperature increases, the intrinsic stand off ratio_____
1. Decreases
2. Increases
3. Essentially remains the same
4. None of the above
Answer: Essentially remains the same
17. A triac is a ______ switch.
1. Mechanical
2. Bidirectional
3. Unidirectional
4. None of the above
Answer: Bidirectional
18. A diac is simply____
1. A triac without gate terminal
2. A three junction device
3. A single junction device
4. None of the above
Answer: A triac without gate terminal
19.The typical value of scr for modern alternator is________
1. 0.5
2. 0.15
3. 0.05
4. 0.4
Answer: 0.5
20. The TRIAC is the same as_____
1. three SCR connected in parallel
2. Two SCR connecter in antiparallel
3. Two SCR connected in reverse
4. None of the above
Answer: Two SCR connected in antiparallel
21. When the temperature increases, the inter-base resistance (RRB) of a UJT______
1. Remains the same
2. Decreases
3. Increases
4. None of the above
Answer: Increases
22. In a UJT, the p-type emitter is_____ doped.
1. Lightly
2. heavily
3. Moderately
4. None of the above
Answer: Heavily
23. The device that does not have the gate terminal is_______
1. Triac
2. Diac
3. FET
4. SCR
Answer: Diac
24. A rectifier for welding has voltage/current characteristics as
1. Drooping
2. rising
3. flat
4. straight line
Answer: Drooping
25. switching frequency of SITH is_____
1. 170 KHz
2. 250 KHz
3. 100 KHz
4. 50 KHz
Answer: 100 KHz
26. The latching current of GTO should be order to_____
1. 400 mA
2. 200 mA
3. 500 mA
4. 750 mA
Answer: 500 mA
27. For the high-frequency choppers, the device that is preferred is_______
1. TRIAC
2. Transistor
3. GTO
4. None of the above
Answer: Transistor
28. The SCR is turned -off when the anode current falls ________ holding current.
1. equal to
2. above
3. Below
4. None of the above
Answer: Below
29. In an SCR circuit, the angle of conduction is changed by changing ______
1. changing anode voltage
2. Reverse biasing the gate
3. Gate voltage
4. None of the above
Answer: Gate voltage
30. An SCR is _______triggered device.
1. Current
2. voltage
3. voltage as well as current
4. None of the above
Answer: Current
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