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AE 2019 || Day 7 || Power Electronics Quiz 3

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Question 1

What is the waveform of the current flowing through the diode in a buck-boost converter?

Question 2

A DC chopper is used in regenerative braking mode of a dc series motor. The dc supply is 600 V, the duty cycle is 70%. The average value of armature current is 100 A. It is continuous and ripple free. What is the value of power feedback to the supply?

Question 3

A two-quadrant d.c. to d.c. chopper can operate with which of the following load conditions?
1. +ve voltage, +ve current
2. -ve voltage, +ve current
3. -ve voltage, -ve current
4. +ve voltage, -ve current
Select the correct answer using the code given below:

Question 4

A voltage source inverter is used when source and load inductances are respectively

Question 5

A PWM switching scheme is used with a three phase inverter to

Question 6

For elimination of 5^th harmonics from the output of an inverter, what will be the position of pulse in a PWM inverter?

Question 7

An integral cycle a.c. voltage controller is feeding a purely resistive circuit from a single-phase a.c. voltage source. The current waveform consists alternately burst of N-complete cycle of conduction followed by M-complete of extinction. The rms value of the load voltage equals the rms value of supply voltage for

Question 8

Maximum string efficiency is achieved when

Question 9

An SCR has V_s = 600 V.

and

It is used to energize a 100 Ω resistance load.
What are the minimum values for an RC snubber circuit to avoid unintentional triggering? (Vs means peak supply voltage).Take

Question 10

Which one of the following power semiconductor device has bidirectional current capability?

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ESE & GATE EE General

Dec 1ESE & GATE EE