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Electrical Engineering: Power Electronics Quiz 1

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Question 1

A step down chopper is operated in the continuous conduction mode in steady state with a constant duty ratio D. If V0 is the magnitude of the dc output voltage and if Vs is the magnitude of the dc input voltage, the ratio $Description: D:\GradeStack Courses\GATE Tests (Sent by Ravi)\GATE-EE-ME-19-Mar\GATE-EE-2002_files\image063.png$ is given by

Question 2

Given below is a three-phase bridge inverter with 6 load-carrying thyristors Th₁ to Th₆ and 6 freewheeling diodes D₁ to D₆.

At an instant, the 3 phase-to-neutral voltages across the loads are given as,

where V_dc is the input dc voltage. Which of the following thyristors are conducting at this instant?

Question 3

When a voltage source is connected across a load, the total harmonic distortion of the load current is computed to be 76%. Determine the distortion factor of the load current.

Question 4

In a buck-boost converter, the duty ratio is set to 0.32. What percentage of the source voltage is provided as the output of the converter?

Question 5

If an input voltage,

is applied to the full converter feeding a dc motor, derive the expression for the average motor terminal voltage.

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ESE & GATE EE Power Electronics

Nov 27ESE & GATE EE