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GATE 2019: Power Electronics Rapid Quiz 1

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Question 1

Gate trigger voltage and current of a thyrsitor are 1.6V and 100mA. A 10Ω resistance is connected across the gate-cathode terminals. The trigger supply voltage is 10V. Then, find the series resistance required to be connected with gate to ensure turn on of the device.

Question 2

A single phase PWM inverter is giving an output pulse of width 150⁰ in each half cycle. Find the THD.

Question 3

A 3 – phase full converter connected to a load R = 15 Ω, E = 300 V. Converter is fed from 415 V, 50 Hz source and a large inductance is connected to the output so that output current is ripple free. Calculate the power delivered to the load for firing angle of 45°?

Question 4

Consider a full-wave bridge rectifier comprising of silicon diodes, and supplied by a transformer of 8:1 turns ratio. The source voltage is 120 Vrms. If the diodes are assumed to be ideal, determine the % change in the dc load voltage.

Question 5

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.

Question 6

A non-sinusoidal periodic waveform is expressed as the sum of a series of sine wave frequencies. The amplitudes of the n^th term is given by the relation:

If the fundamental frequency is 115 Hz, determine the amplitude of the term at 1495 Hz.

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ESE & GATE EE Power Electronics

Nov 21ESE & GATE EE