For an SCR in the reverse blocking mode, (practically)

leakage current flows from cathode to anode

leakage current flows from anode to cathode

leakage current flows from gate to anode

A freewheeling diode placed across a RL load provides

demagnetisation path for inductor

demagnetisation path for resistor

demagnetisation path for switch

magnetisation path for inductor

To make a signal diode suitable for high current & high voltage carrying applications with minimum losses, ________ To make a signal diode suitable for high current & high voltage carrying applications with minimum losses, ________ To make a signal diode suitable for high current & high voltage carrying applications with minimum losses, ________

a lightly doped p layer is grown between the two p & n layers

a lightly doped n layer is grown between the two p & n layers

a heavily doped n layer is grown between the two p & n layers

a heavily doped p layer is grown between the two p & n layers

An ideal power diode must have

large reverse breakdown voltage

low forward current carrying capacity

The GTO can be turned off

by a negative anode-cathode voltage

Class E commutation is a/an

external-pulse commutation technique

The forward break over voltage is maximum when

It is independent of gate current

Choose the requirements to turn-on the thyristors in a controlled full-wave rectifiers.

Applying a control signal to the gate terminal of the thyristors.

The anode terminal of the thyristors is negative.

The cathode terminal of the thyristor is positive.

The half-cycle of the AC supply voltage is positive.

A diode is said to be reversed biased when the

cathode is positive with respect to the anode

anode is positive with respect to the cathode

cathode is negative with respect to the anode

both cathode & anode are negative

A diode is said to be forward biased when the

anode is positive with respect to the cathode

cathode is positive with respect to the anode

anode is negative with respect to the anode

both cathode & anode are positive

The SITH (Static Induction Thyristor) is a

3 terminal, self-controlled device

4 terminal, self-controlled device

4 terminal, un-controllable device

3 terminal, un-controllable device

Why an SCR is considered to be a semi controlled device because

it can be turned ON but not OFF with a gate pulse.

it can be turned OFF but not ON with a gate pulse.

it conducts only during one half cycle of an alternating current wave.

it can be turned ON only during one half cycle of an AC.

IE important QP

Quiz

•

Physics

•

12th Grade

•

Practice Problem

•

Medium

LAVANYA R

Used 3+ times

FREE Resource

82 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

The three terminals of the IGBT are

base, emitter & collector

gate, source & drain

gate, emitter & collector

base, source & drain

2.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

IGBT possess

low input impedance

high input impedance

high on-state resistance

second breakdown problems

3.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Which of the following diodes uses a metal-semiconductor junction?

General purpose diodes

Fast recovery diodes

Schottky diode

Slow recovery diode

4.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

The V-I Characteristics of the diode lie in the

1st & 2nd quadrant

1st & 3rd quadrant

1st & 4th quadrant

Only in the 1st quadrant

5.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

The TRIAC can be represented by

two SCRs in anti-parallel

two SCRs in parallel

two diodes in anti-parallel

two diodes in parallel

6.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

two diodes in parallel

forward current rating

breakover voltage

holding current

latching current

7.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

If the cathode of an SCR is made positive with respect to the anode & no gate current is applied then

all the junctions are reversed biased

all the junctions are forward biased

only the middle junction is forward biased

only the middle junction is reversed biased

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82 questions

The three terminals of the IGBT are

IGBT possess

Which of the following diodes uses a metal-semiconductor junction?

The V-I Characteristics of the diode lie in the

The TRIAC can be represented by

two diodes in parallel

If the cathode of an SCR is made positive with respect to the anode & no gate current is applied then

The GTO (gate turn-off thyristor) is a

For an SCR in the reverse blocking mode, (practically)

A GTO can be turned on by applying

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