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AE 2019 || Day 8 || Power Electronics Quiz 4

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Question 1

An SCR triggered by a current pulse applied to the gate-cathode can be turned off

Question 2

When a thyristor in the forward blocking state, then

Question 3

A thyristor has a PIV of 650 V. The voltage safety factor is 2. Then the voltage upto which the devices can be operated is given by

Question 4

An SCR is in conducting state, a reverse voltage is applied between anode and cathode, but is fails to turn off. What could be the reason.

Question 5

Triacs cannot be used in AC voltage regulator for a

Question 6

In a 3-∅ controller bridge rectifier, the maximum conduction of each thyristor is

Question 7

Compute the ripple factor of a single phase full wave rectifier with load resistance R_L =10 kΩ. Forward bias dynamic resistance of diodes used is 100 Ω. The rms voltage across secondary winding is 330 V.

Question 8

In a three-phase semi-converter, if firing angle is less than or equal to 60 °, then the duration of conduction of each thyristor and diode would be respectively

Question 9

A single phase half-controlled bridge converter is operating from an r.m.s. input voltage of 120 V. Neglecting the voltage drops, what are the mean load voltage at a firing delay angle of 0 ° and 180 °, respectively?

Question 10

In circuit diagram, power supplied to 50Ω resistive heating element driven from single-phase 230IV, 50IHz supply is controlled by thyristor. What will be the firing angle required for heating element to be supplied with average power of 500W?

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ESE & GATE EE General

Jun 8ESE & GATE EE