GATE EE topic:power-electronics PYQs & Answers — Page 6

Questions 51–60 of 66. Imported answers require independent review unless marked reviewed.

The waveform of the current drawn by a semi-converter from a sinusoidal AC voltage source is shown in the figure. If

A, the rms value of fundamental component of the current is __________ A (up to 2 decimal places).

Diagram for Electrical Engineering question 23

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A phase controlled single phase rectifier, supplied by an AC source, feeds power to an R-L-E load as shown in the figure. The rectifier output voltage has an average value given by

, where

volts and

is the firing angle. If the power delivered to the lossless battery is 1600 W,

in degree is_______ (up to 2 decimal places).

Diagram for Electrical Engineering question 49

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The figure shows two buck converters connected in parallel. The common input dc voltage for the converters has a value of 100 V. The converters have inductors of identical value. The load resistance is 1

. The capacitor voltage has negligible ripple. Both converters operate in the continuous conduction mode. The switching frequency is 1 kHz, and the switch control signals are as shown. The circuit operates in the steady state. Assuming that the converters share the load equally, the average value of

, the current of switch S1 (in Ampere), is ____ (up to 2 decimal places).

Diagram for Electrical Engineering question 50

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A dc to dc converter shown in the figure is charge a battery bank, B2 whose voltage is constant at 150 V. B1 is another battery bank whose voltage is constant at 50 V. The value of the inductor, L is 5 mH and the ideal switch, S is operated with a switching frequency of 5 kHz with a duty ratio of 0.4. Once the circuit has attained steady state and assuming the diode D to be ideal, the power transferred from B1 to B2 (in Watt) is __________ (up to 2 decimal places).

Diagram for Electrical Engineering question 53

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A phase-controlled, single-phase, full-bridge converter is supplying a highly inductive DC load. The converter is fed from a 230 V, 50 Hz, AC source. The fundamental frequency in Hz of the voltage ripple on the DC side is

Your answerChoose one option.

100

300

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In the circuit shown, the diodes are ideal, the inductance is small, and

. Which one of the following statements is true?

Diagram for Electrical Engineering question 12

Your answerChoose one option.

D₁ conducts for greater than 180° and D₂ conducts for greater than 180°.

D₂ conducts for more than 180° and D₁ conducts for 180°.

D₁ conducts for 180° and D₂ conducts for 180°.

D₁ conducts for more than 180° and D₂ conducts for 180°.

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A three-phase voltage source inverter with ideal devices operating in 180° conduction mode is feeding a balanced star-connected resistive load. The DC voltage input is

. The peak of the fundamental component of the phase voltage is

Your answerChoose one option.

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For the power semiconductor devices IGBT, MOSFET, Diode and Thyristor, which one of the following statements is TRUE?

Your answerChoose one option.

All the four are majority carrier devices.

All the four are minority carrier devices.

IGBT and MOSFET are majority carrier devices, whereas Diode and Thyristor are minority carrier devices.

MOSFET is majority carrier device, whereas IGBT, Diode, Thyristor are minority carrier devices.

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The figure below shows the circuit diagram of a controlled rectifier supplied from a 230 V, 50 Hz, 1-phase voltage source and a 10:1 ideal transformer. Assume that all devices are ideal. The firing angles of the thyristors

and

are 90° and 270°, respectively.

Diagram for Electrical Engineering question 16

The RMS value of the current through diode

in amperes is _________.

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In the converter circuit shown below, the switches are controlled such that the load voltage

is a 400 Hz square wave.

Diagram for Electrical Engineering question 24

The RMS value of the fundamental component of

in volts is ________.

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GATE EE topic:power-electronics PYQs

Question 23

Question 49

Question 50

Question 53

Question 11

Question 12

Question 13

Question 15

Question 16

Question 24