Power Electronics - ECE Questions and Answers

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In the basic series inverter circuit, the source current has

low harmonic content

high harmonic content

low or high harmonic content depending on firing angle

zero harmonic content

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Thyristors connected in series need static and dynamic stabilizing circuits.

True

False

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In a controlled rectifier a freewheeling diode is necessary if the load is

inductive

resistive

capacitive

any of the above

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For an illumination control circuit it is advisable to use a matched TRIAC-DIAC pair.

True

False

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A single phase converter is fed by a source having an inductance L. If load current is I₀, the decrease in output voltage due to overlap is

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Assertion (A): An ac regulator uses natural commutation

Reason (R): An ac regulator can be used for static on load tap changing of transformer.

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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When a UJT is used as a relaxation oscillator the current should be

less than I_p

more than I_v

more than I_p but less than I_v

negative

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In auxiliary commutated chopper, the charging and discharging time of capacitor

are constant

depend on load current

may be constant or may depend on load current

none of the above

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Which chopper circuit uses saturable reactor?

Auxiliary commutated

Jones chopper

Morgan chopper

Load commutated