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GATE 2020 || Power Electronics || Quiz 4

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Question 1

Match the following

Question 2

A full-wave rectifier is connected to the load resistor via two capacitor filters as shown below.

Determine the output voltage across the load resistor. Assume ideal diodes.

Question 3

A 3-ϕ, 50 Hz fully controlled bridge converter is fed with ac source has inductance of 20 mH/phase. If the thyristor firing angle is 30 ° and the overlap angle is 10 °, then the constant dc load current is ________ A.

Question 4

A three-phase half-wave controlled rectifier circuit is shown in the figure. It is operated from 3-ϕ star-connected, supply transformer with a line to line ac supply voltage of 440 volts rms, at 50 Hz. The thyristors are triggered at a delay angle of α=30o. Assume continuous ripple-free current.

The average output current is _______ A.

Question 5

A single phase full bridge converter with a free wheeling diode feeds an inductive load. The load has large inductance, hence, the output current is constant. The load also consists of a resistance of 11.3Ω. The input voltage source is a 220V, 50Hz source. For a firing angle delay of 450, find the average value of freewheeling diode current.

Question 6

A half-wave thyristor converter supplies a purely inductive load, as shown in Fig. If the triggering angle of the thyristor is 120 °, the extinction angle will be

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Sep 16ESE & GATE EE