Top 10 Basic Power Electronics MCQs

01. A chopper is a/an:

1. AC to AC Converter
2. AC to DC Converter
3. DC to AC Converter
4. DC to DC Converter

Correct answer: 4. DC to DC Converter

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02. A thyristor has three terminals, namely:

1. Anode, Cathode, Gate
2. Anode, Cathode, Base
3. Base, Collector, Emitter
4. Base, Collector, Gate

Correct answer: 1. Anode, Cathode, Gate

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03. Device with bidirectional capability:

1. GTO
2. SCR
3. TRIAC
4. BJT

Correct answer: 3. TRIAC

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04. Converter which converts DC to AC:

1. Rectifier
2. Inverter
3. Chopper
4. None of these

Correct answer: 2. Inverter

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05. Commutation in thyristor is:

1. Process of turning on the thyristor
2. Process of turning off the thyristor
3. To hold the original position
4. None of the above

Correct answer: 2. Process of turning off the thyristor

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6. The ripple factor is the ratio of:

1. Average value/RMS value
2. RMS value/Average value
3. Average value/Maximum value
4. Maximum value/RMS value

Correct answer: 2. RMS value/Average value

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7. Necessary condition for Thyristor to conduct current:

1. The thyristor must be forward biased
2. Current must be applied to the gate of the thyristor
3. Both of these
4. None of these

Correct answer: 3. Both of these

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8. Power electronic circuits are operated in:

1. Linear mode
2. Switching mode
3. Both of these
4. None of these

Correct answer: 2. Switching mode

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9. A cycloconverter is a/an:

1. AC to AC Converter
2. AC to DC Converter
3. DC to AC Converter
4. DC to DC Converter

Correct answer: 1. AC to AC Converter

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10. Correct terminals in MOSFET:

1. Gate, Source, Base
2. Gate, Emitter, Base
3. Gate, Drain, Source
4. Emitter, Collector, Gate

Correct answer: 3. Gate, Drain, Source