GATE EE topic:power-electronics PYQs & Answers — Page 3

Questions 21–30 of 66. Imported answers require independent review unless marked reviewed.

A semiconductor switch needs to block voltage V of only one polarity (V > 0) during OFF state as shown in figure (i) and carry current in both directions during ON state as shown in figure (ii). Which of the following switch combination(s) will realize the same?

Diagram for Electrical Engineering question 26

Your answerSelect all correct options. You can choose more than one.

Diagram for Electrical Engineering question 26 (figure 2)

Diagram for Electrical Engineering question 26 (figure 3)

Diagram for Electrical Engineering question 26 (figure 4)

Diagram for Electrical Engineering question 26 (figure 5)

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All the elements in the circuit shown in the following figure are ideal. Which of the following statements is/are true?

Diagram for Electrical Engineering question 44

Your answerSelect all correct options. You can choose more than one.

When switch S is ON, both

and

conducts and

is reverse biased

When switch S is ON,

conducts and both

and

are reverse biased

When switch S is OFF,

is reverse biased and both

and

conduct

When switch S is OFF,

conducts,

is reverse biased and

conducts

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The circuit shown in the figure has reached steady state with thyristor T in OFF condition. Assume that the latching and holding currents of the thyristor are zero. The thyristor is turned ON at t = 0 sec. The duration in microseconds for which the thyristor would conduct, before it turns off, is _____ (Round off to 2 decimal places).

Diagram for Electrical Engineering question 55

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The single phase rectifier consisting of three thyristors T₁, T₂, T₃ and a diode D₁ feed power to a 10 A constant current load. T₁ and T₃ are fired at α = 60° and T₂ is fired at α = 240°. The reference for α is the positive zero crossing of vᵢₙ. The average voltage Vₒ across the load in volts is _____ (Round off to 2 decimal places).

Diagram for Electrical Engineering question 58

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A charger supplies 100 W at 20 V for charging the battery of a laptop. The power devices, used in the converter inside the charger, operate at a switching frequency of 200 kHz. Which power device is best suited for this purpose?

Your answerChoose one option.

IGBT

Thyristor

MOSFET

BJT

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A single-phase full-bridge diode rectifier feeds a resistive load of 50

from a 200 V, 50 Hz single phase AC supply. If the diodes are ideal, then the active power, in watts, drawn by the load is ____________. (round off to nearest integer).

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The voltage at the input of an AC-DC rectifier is given by

where

rad/s. The input current drawn by the rectifier is given by

The input power factor, (rounded off to two decimal places), is __________________ lag.

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Consider an ideal full-bridge single-phase DC-AC inverter with a DC bus voltage magnitude of 1000 V. The inverter output voltage

shown below, is obtained when diagonal switches of the inverter are switched with 50 % duty cycle. The inverter feeds a load with a sinusoidal current given by,

A, where

. The active power, in watts, delivered to the load is ________. (round off to nearest integer)

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For the ideal AC-DC rectifier circuit shown in the figure below, the load current magnitude is

A and is ripple free. The thyristors are fired with a delay angle of 45°. The amplitude of the fundamental component of the source current, in amperes, is __________. (round off to two decimal places)

Diagram for Electrical Engineering question 59

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A 3-phase grid-connected voltage source converter with DC link voltage of 1000 V is switched using sinusoidal Pulse Width Modulation (PWM) technique. If the grid phase current is 10 A and the 3-phase complex power supplied by the converter is given by

VA, then the modulation index used in sinusoidal PWM is __________. (round off to two decimal places)

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GATE EE topic:power-electronics PYQs

Question 26

Question 44

Question 55

Question 58

Question 22

Question 32

Question 33

Question 58

Question 59

Question 60