GATE EE Power Electronics PYQs & Answers

Questions 1–10 of 66. Imported answers require independent review unless marked reviewed.

The figure shows a straight-line approximation for the forward characteristics of a power diode. A continuous on-state current of 15 A is flowing through the diode.

Diagram for Electrical Engineering question 27

What is the power loss in the diode?

Your answerChoose one option.

32.8 W

21.2 W

18.6 W

23.1 W

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Consider the circuit shown in Figure (a). A gate pulse

is applied between time instants

and

. After

, during the MOSFET turn OFF process, it experiences a voltage overshoot.

Based on the

waveforms shown in Figure (b), which one of the following options is correct?

Diagram for Electrical Engineering question 28

Your answerChoose one option.

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Consider the circuit shown. Assume that the diode D is ideal. The supply voltage

, and

. The peak diode current (in amperes) is ______________

(Round off to one decimal place)

Diagram for Electrical Engineering question 34

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Consider the single-phase voltage source inverter circuit feeding an inductive load (L). Assume that the power MOSFET switches are ideal. S₁ and S₂ are switched on during the first 10 μs, and S₃ and S₄ are switched on during the next 10 μs in a switching cycle. The switches in the same leg are thus switched in a complementary fashion. Neglect the dead time. The waveform of the inductor current (i_L) in the steady state is triangular with a peak value of 5 A as shown.

Diagram for Electrical Engineering question 47

The rms value of the current through the switch S₁ is:

Your answerChoose one option.

2.8 A

2.04 A

3.54 A

2.50 A

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Consider the boost converter circuit shown. Assume that the semiconductor devices are ideal. In steady state, the inductor current rises linearly from 0 A to 6 A in the first 10

and then falls linearly from 6 A to 0 A in the next 10

of every switching cycle as shown. The load resistance R is 10

and the capacitance C is 500

Diagram for Electrical Engineering question 48

Neglect the ripple in the output voltage. What is the input voltage

Your answerChoose one option.

10.0 V

15.0 V

7.5 V

12.5 V

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Consider the circuit shown. Assume that the diode (D) is ideal.

Diagram for Electrical Engineering question 61

Given

V, and

, the average value of the current through the diode is __________ A (Round off to two decimal places)

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The input voltage

and current

of a converter are given by,

where,

. The input power factor of the converter is closest to

Your answerChoose one option.

0.845

0.867

0.887

1.0

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In the circuit with ideal devices, the power MOSFET is operated with a duty cycle of 0.4 in a switching cycle with

and

. The power delivered by the current source, in W, is __________ (round off to the nearest integer).

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The 3-phase modulating waveforms

and

, used in sinusoidal PWM in a Voltage Source Inverter (VSI) are

where

is the fundamental frequency. The modulating waveforms are compared with a 10 kHz triangular carrier whose magnitude varies between +1 and −1. The VSI has a DC link voltage of 600 V and feeds a star connected motor. The per phase fundamental RMS motor voltage, in volts, is closest to

Your answerChoose one option.

169.71

300.00

424.26

212.13

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An ideal sinusoidal voltage source

feeds an ideal inductor

through an ideal SCR with firing angle

. If

, then the peak of the inductor current, in ampere, is closest to

Your answerChoose one option.

20.71

10.35

7.32

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GATE EE Power Electronics PYQs

How to practice Power Electronics

Question 27

Question 28

Question 34

Question 47

Question 48

Question 61

Question 27

Question 34

Question 46

Question 47