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GATE 2022 : Power Electronics Quiz 4

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Question 1

A single phase half wave rectifier circuit is shown in the figure. The thyristor is fired at 30° in each positive half cycle. The values of average load voltage and the rms load voltage will respectively be

Question 2

A bridge converter is fed from a source Vs = Vm sinωt as shown in the following figure. What will be the output voltage for a firing angle of α? Assume continuous conduction.

Question 3

A converter is feeding RLE load as shown below:

If frequency of switching and duty cycle are 1 kHz and 0.5 than the peak value of load current is:

Question 4

A single-phase half-controlled bridge rectifier is feeding a load drawing a constant and ripple free load current at a firing angle α = π/6. The harmonic factor (HF) of input current and the input power factor respectively are

Question 5

A single-phase two pulse diode rectifier has input supply of 230 V, 50 Hz and load resistance R = 30 Ω. The value of inductance to be connected in series with ‘R’ so as to limit the current ripple factor 6% is (Assume second harmonic component as the most domination component of Ir (ripple current) and neglect higher order even harmonics).

Question 6

A single-phase, full-bridge, fully controlled thyristor rectifier feeds a load comprising a 10 Ω resistance in series with a very large inductance. The rectifier is fed from an ideal 230 V, 50 Hz sinusoidal source through cables which have negligible internal resistance and a total inductance of 2.28 mH. If the thyristors are triggered at an angle α = 45°, the commutation overlap angle in degree (rounded off to 2 decimal places) is ______.
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