POWER ELECTRONICS QUIZ

Switching frequency of SITH is

60 KHz.

10 KHz.

100 KHz.

5 KHz.

TRUE ANSWER : ?
YOUR ANSWER : ?

Leakage current flows through the thyristor in

both forward and reverse blocking mode.

reverse blocking mode.

forward blocking mode.

forward conduction mode.

TRUE ANSWER : ?
YOUR ANSWER : ?

A single phase one pulse controlled circuit has a resistance R and counter emf E load 400 sin(314 t) as the source voltage. For a load counter emf of 200 V, the range of firing angle control is

30° to 150°.

60° to 120°.

60° to 180°.

30° to 180°.

TRUE ANSWER : ?
YOUR ANSWER : ?

How can we protect SCR from thermal conditions ?

Use of snubber circuit.

Using heat sink.

Using CB and fuse.

Using equalizing circuit.

TRUE ANSWER : ?
YOUR ANSWER : ?

Anode current in an SCR consists of

either electron or holes.

electrons only.

Both electron and holes.

holes only.

TRUE ANSWER : ?
YOUR ANSWER : ?

A triac has ___________ semiconductor layers.

Four

Five

Two

Three

TRUE ANSWER : ?
YOUR ANSWER : ?

The device that exhibits negative resistance region is ___________.

Diac

UJT

Transistor

Triac

TRUE ANSWER : ?
YOUR ANSWER : ?

Calculate the maximum voltage that can be safely blocked by the string shown in figure, if maximum allowable leakage current is 2 mA?

8 KV.

2 KV.

6 KV.

10 KV.

TRUE ANSWER : ?
YOUR ANSWER : ?

If the anode current is 800 A, then the amount of current required to turn off the GTO is about

200 A.

400 A.

20 A.

600 A.

TRUE ANSWER : ?
YOUR ANSWER : ?

Thyristor is nothing but a

Amplifier with large current gain.

Controlled transistor.

Amplifier with higher gain.

Controlled switch.

TRUE ANSWER : ?
YOUR ANSWER : ?

↑