GATE 2019: Power Electronics Rapid Quiz 2

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Question 1

If a single phase inverter operated using PWM gives square output of magnitude 1V of width 100⁰ in each half cycle. Then, determine the rms value of fundamental component.

• A0.7814V
• B0.6897V
• C0.5996V
• D0.7012V

Question 2

Given below are the reverse recovery characteristics of a power diode. Which of the following expression gives the softness factor of the diode?

• A
• B
• C
• D

Question 3

A sinusoidal voltage of 100 Vrms is applied to a half-wave rectifier shown below. Two dc voltmeters are connected to measure the input and the output dc voltages. Determine the reading of the voltmeters.

• A0 V, 44.8 V
• B31.8 V, 31.6 V
• C45 V, 44.8 V
• D141.4 V, 140.07 V

Question 4

Determine the ripple factor for a full wave bridge rectifier, assuming ideal diodes and purely resistive load.

• A0.482
• B0.572
• C0.636
• D1.21

Question 5

Below figure shows a switched-capacitor converter based chopper. Switch 1 is closed to charge the capacitor. It is then opened and switch 2 is closed to produce the output voltage. Determine the output voltage of the converter if a source voltage of 9 V is applied to the converter.

• A4.5 V
• B12 V
• C18 V
• D27 V

Question 6

What is the distortion factor of the second lowest-order harmonic of a voltage waveform comprising of the harmonics 1, 3, 5, 7,…?

• A0.8%
• B2.0%
• C3.7%
• D4.0%

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