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BARC-2018 EE: Power Electronics Nuclear Quiz 3

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Question 1

A buck converter is designed to produce an output voltage of 5 V from a 9 V dc source. It is connected across a load resistor of 75 Ω. Determine the value of inductance that will ensure continuous current for the switching frequency of 450 kHz.

Question 2

Shown below is an ac-dc semi-converter feeding a separately excited dc motor.

Which of the following statement is true in the period (π – π+α), where α is the firing angle of the thyristors?

Question 3

In a single phase full wave diode bridge rectifier, the diodes have a reverse recovery time of 40 μs. For an input voltage of 230 V and f = 2500 Hz, the percentage reduction in average output voltage due to the effect of reverse recovery time is ------- %.

Question 4

A chopper circuit shown below has input dc voltage of 200 V and a load of R = 10 Ω in series with an inductor of L = 80 mH. If load current varies linearly between 12 A and 16 A, then time ratio for this chopper is ---------.

Question 5

The circuit shown is meant to supply a resistive load RL from two separate DC voltage sources. The switches S1 and S2 are controlled so that only one of them is ON at any instant. S1 is turned on for 0.2 ms and S2 is turned on for 0.3 ms in a 0.5 ms switching cycle time period. Assuming continuous conduction of the inductor current and negligible ripple on the capacitor voltage, the output voltage V0 (in Volt) across RL is ______________.
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Sep 5ESE & GATE EE