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GATE 2019: Power Electronics Rapid Quiz 3
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Question 1
As compared to the centrally-tapped full wave rectifier, the PIV rating of the diodes employed in a full-wave bridge rectifier is:
Question 2
Two 3-phase ac-dc controlled converters are connected via a dc line. The firing angle for one converter is set at α = 60 °. Which of the following value of the firing angle (in degree) is not suitable for the other converter to achieve dc power transmission?
Question 3
For the given boost converter circuit, determine the average inductor current when the duty cycle is 0.75, assuming ideal components.
Question 4
Below figure shows a switched-capacitor converter comprising of two capacitors.
When switch 1 is closed, the capacitors are connected in series, and when the switch 2 is closed, they are connected in parallel. The output voltage produced is:
When switch 1 is closed, the capacitors are connected in series, and when the switch 2 is closed, they are connected in parallel. The output voltage produced is:
Question 5
A bridge inverter with an input dc voltage of 240 V, produces an ac output voltage using the sinusoidal PWM. The output voltage has 6 pulses per half cycle with widths π/6, π/3, 2π/3, 2π/3, π/3, π/6 respectively. Determine the rms output voltage [in Volt].
Question 6
A single phase full converter is feeding a RLE load. The voltage source is of 220V, 50Hz and load is R=5ohms, E=50V & the firing angle of SCRs is 250. The load current is constant as load inductance is very large. Find the value of input power factor.
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Dec 4ESE & GATE EE