will test your knowledge of power electronics, including power devices and circuits, with our online multiple-choice questions. Get instant feedback and track your progress. Challenge yourself to get the highest score. Twenty (20) MCQ questions from our test bank will be randomly shown for every attempt. Passing mark for this test is 70%.

Objectives: To provide a comprehensive overview of power electronics and to test readers’ knowledge of the subject with multiple choice questions.

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

When a UJT is used for triggering of an SCR, the waveshape of the voltage is a

Optocouplers combine

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

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

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

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

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

The normal way to close a SCR is by

For thyristors, pulse triggering is preferred to triggering because

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

UJT oscillators are used for gate-triggering of thyristors for

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

With gate open, a SCR can be turned-on by making supply voltage

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

As compared to UJT, SUS

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

A device that does not exhibit negative resistance characteristic is

The uncontrolled electronic switch employed in power-electronic converters is