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GATE 2019: Power Electronics Quiz 2

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Question 1

For the given SCR circuit, determine the value of the supply voltage below which the SCR will turn-off.

Question 2

A SCR is rated 1kV, 100A. How many SCR’s in series need to be connected for a circuit of 11kV, 100A, if the derating factor is 20%?

Question 3

The figure below shows the construction of a typical thyristor with four layers and three p-n junctions.

In order to increase the forward-blocking voltage rating of the thyristor, which of the following region is made thicker?

Question 4

A N-channel IGBT can be realized as a combination of:

Question 5

The latching current for a thyristor inserted between a dc source voltage of 80V and a load being 55mA. Calculate the minimum width of the gate-pulse required to turn-on the thruster when the load is
(i)Purely inductive having an inductance of 50 mH and
(ii) Consisting of resistance and inductance of 5 ohm and 50 mH respectively.

Question 6

The Zener Potential of a Zener diode is very sensitive to temperature.
Analyze the change in 10 V zener diode if the temperature is increased to 100 C
Given, temperature coefficient = |0.072| / degree centigrade and intial temperature was 25 C where || represents absolute value function.

Question 7

An SCR has V_g-I_g characteristics given as V_g = 1.5 + 8 I_g. In a certain application, the gate voltage consists of rectangular pulses of 12 V and of duration 50 μs with duty cycle 0.2. The value of R_g series resistor in gate circuit to limit the peak power dissipation in the gate to 5 watts is

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ESE & GATE EE Power Electronics

Sep 12ESE & GATE EE