Power Electronics - ECE Questions and Answers

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Natural commutation can be used in :

DC circuits only

AC circuits only

both AC and DC circuits

none of the above

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In a thyristor the gate lead is connected to the n layer near the p layer to which anode is connected.

True

False

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A single phase half wave rectifier circuit has a free wheeling diode. The free wheeling diode will conduct only if

load is purely resistive

load is purely inductive

load is combination of R and L

load is purely inductive or combination of R and L

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McMurray Bedford full bridge inverter uses

natural commutation

auxiliary commutation

complementary commutation

any of the above

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Which converter is used in HVDC transmission?

3 pulse

6 pulse

12 pulse

24 pulse

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Assertion (A): The turn on time of SCR is about 1 to 4 ms.

Reason (R): The turn off time of SCR is about 10 to 300 ms.

Both A and R are correct and R is correct explanation of A

Both A and R correct but R is not correct explanation of A

A is correct but R is wrong

A is wrong but R is correct

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An n pulse rectifier is fed by a source having an inductance L. If load current is I₀, the voltage drop due to overlap is

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Which chopper circuit operates in all the 4 quadrants?

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A single phase cycloconverter feeds a resistance heating load. The heating power is provided by

only the fundamental component of output wave

only higher harmonics in the output wave

both fundamental and higher harmonics in the output wave

either (a) or (b)