Subject Revision:Power Electronics Quiz

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Question 1

In a buck-boost converter circuit, determine the time for which the switch should be kept open in order to produce an output voltage of magnitude 5 V from a source voltage of 12 V. The switching frequency is 20 kHz.

• A12.5 µsec
• B21.8 µsec
• C29.6 µsec
• D35.3 µsec

Question 2

A current signal with harmonics is supplied to an induction motor. Which of the following harmonic will create torque problems in the motor?

• A3^rd
• B4^th
• C5^th
• D6^th

Question 3

For the given boost converter circuit, determine the average inductor current when the duty cycle is 0.75, assuming ideal components.

• A1.37 A
• B2.2 A
• C4.38 A
• D5.5 A

Question 4

A dc chopper is built employing an electronic switch as shown below. Determine the power absorbed by the switch. Assume switch to be ideal.

• A0
• B
• C
• D

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

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