Power Electronics

Welcome to your Power Electronics  MCQ practice assessment.

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

UJT oscillators are used for gate-triggering of thyristors for

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

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

The uncontrolled electronic switch employed in power-electronic converters is

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

Which of the following PNPN devices does not have a gate terminal?

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

In a UJT, maximum value of charging resistance is associated with

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

Power MOSFET is a

It is recommended to use UJT oscillator for gate-triggering of the thyristors mainly because

As compared to UJT, SUS

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

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

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

A device that does not exhibit negative resistance characteristic is

The normal way to close a SCR is by

Optocouplers combine

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