Power Electronics MCQ Questions & Answers

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Each section contains 100 MCQs on Power Electronics .

An SCR has a turn on time of 4 µs. The gate pulse should be of duration about

A) 2 µs B) 5 µs C) 20 µs D) 50 µs

Discuss

Answer & Solution

Answer: Option B

No explanation is given for this question. Let's Discuss on Board

Which of the following is false for a thyristor?
1. Thyristor is a majority-carrier device.
2. The forward-bias portion of thyristor's i-v characteristics has two stable operating regions.
3. The forward-bias portion of thyristor's i-v characteristics has one stable operating region.
4. The negative gate current turns off the thyristor.

A) 1, 2 B) 2, 3, 4 C) 1, 3, 4 D) 2, 3

Discuss

Answer & Solution

Answer: Option C

No explanation is given for this question. Let's Discuss on Board

The above graph depicts
Power Electronics mcq question image

A) drain characteristic of a MOSFET B) drain characteristic of an IGBT C) volt-ampere characteristic of a triac D) volt-ampere characteristic of an SCR

Discuss

Answer & Solution

Answer: Option C

No explanation is given for this question. Let's Discuss on Board

Which of the following does not cause permanent damage of an SCR?

A) High current B) High rate of rise of current C) High temperature rise D) High rate of rise of voltage

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Answer & Solution

Answer: Option D

No explanation is given for this question. Let's Discuss on Board

Which of the following is control element in Silicon Controlled Resistor (SCR)?

A) Gate B) Anode C) Cathode D) Source

Discuss

Answer & Solution

Answer: Option A

No explanation is given for this question. Let's Discuss on Board

The effect of source inductance on the performance of a single-phase and three-phase full converter is to

A) Reduce the ripples in the output load current B) Make discontinuous current as continuous C) Reduce output voltage D) Increase the load voltage

Discuss

Answer & Solution

Answer: Option C

No explanation is given for this question. Let's Discuss on Board

An SCR has three terminals viz . . . . . . . .

A) Cathode, anode, gate B) Anode, cathode, grid C) Anode, cathode, drain D) None of the above

Discuss

Answer & Solution

Answer: Option A

No explanation is given for this question. Let's Discuss on Board

Which statement is correct for a UJT?

A) Low firing current B) Used as a wave form generator C) Has a stable negative resistance characteristics D) All options are correct

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Answer & Solution

Answer: Option B

No explanation is given for this question. Let's Discuss on Board

In the NMOS inverter

A) The driver and active load are enhancement type B) The driver is enhancement type and load depletion type C) The driver is depletion type and load enhancement type D) Both driver and load are depletion type

Discuss

Answer & Solution

Answer: Option A

No explanation is given for this question. Let's Discuss on Board

The frequency of oscillation of an UJT relaxation oscillator is

A) $$f = {R_1}\ell n\left[ {\frac{1}{{1 - n}}} \right]$$ B) $$f = {R_1}C\ell n\left[ {1 - n} \right]$$ C) $$f = \frac{1}{{{R_1}C\ell n\left[ {\frac{1}{{1 - n}}} \right]}}$$ D) $$f = \frac{1}{{{R_1}C\ell n\left[ {1 - n} \right]}}$$

Discuss

Answer & Solution

Answer: Option C

No explanation is given for this question. Let's Discuss on Board

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Power Electronics MCQ Questions & Answers | ECE