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GATE 2024 Power Electronics Foundation Quiz 49

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Question 1

The limiting value of charging current to turn on thyristor is 25 μA. What is the value of junction capacitance if the value of dv/dt is 800 V/μs is _____? (in pF)

Assuming the junction capacitance of a thyristor to be independent of off state voltage.

Question 2

A DC source of 100 V supplies a purely inductive load 0.1H. The controller is a thyristor in series with the source and load. The latching current specified is 100mA . The minimum width of the gating pulse to ensure thyristor turn ON is

Question 3

The thyristor in figure has a latching current of 50 mA and it is fired by a pulse length of 50 microseconds, the maximum value of R to ensure firing of thyristor is

Question 4

A thyristor has thermal capacity of 0.1 J/ °C and a thermal resistance of 0.9 °C/W. The permissible short-time power loss for the temperature rise of 40 ° C over 0.01 sec is _______ W.

Question 5

The voltage and current rating in a particular circuit are 3 kV and 750 A. SCRs with a rating of 800 V and 175 A are available. The recommended minimum derating factor is 15 percent. Calculate the number of series and parallel units respectively.
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Apr 30ESE & GATE EE