Power Electronics

Welcome to your Power Electronics  MCQ practice assessment.

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Optocouplers combine

The normal way to close a SCR is by

Derating factors for parallel connection of thyristors are normally in the range

A conducting SCR can be opened by reducing __________ to zero.

When transistors are used in series or parallel, a snubber circuit is used to

In series connection, thyristor having the highest leakage resistance or low voltage current will share

Which of the following conditions is necessary for triggering system for thyristors?

Power MOSFET is a

In its application, an SUS behaves in the same way as

The device which cannot be triggered by voltage of either polarity is

UJT oscillators are used for gate-triggering of thyristors for

Thyristor A has rated gate current of 2 A and thyristor B is a rated gate current of 100 mA

In a GTO, anode current begins to fall when gate current

In a SCR circuit, the angle of conduction can be changed by changing

For thyristors, pulse triggering is preferred to triggering because

Which semiconductor power device out of the following is not a current trig- gered device?

A UJT has one base resistance of 5.2 k. Its intrinsic stand of ratio is 0.67. The inter-base voltage of 12 V is applied across the two passes. The value of base current will be

The uncontrolled electronic switch employed in power-electronic converters is

The SCR is turned-off when the anode current falls below

If gate current is increased, the anode-cathode voltage at which SCR closes is

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