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GATE 2024 Power Electronics Foundation Quiz 53

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Question 1

In buck-boost converter has Vd = 12 V, V0 = 15 V and I0 = 250 mA . The switching frequency is 20 kHz. Calculate the value of critical Inductance.

Question 2

For a DC series motor running in a regenerative braking mode DC chopper of 0.7 duty ratio is used. If DC supply is ‘a’ volts and average armature current is ‘β’ A which is continuous and ripple free, the value of power feedback to the supply will be ________.

Question 3

For a buck boost converter having duty ratio 0.6 and supply current (input current) 12 A, output current will be_____ A

Question 4

A 200 V, 10 A, 1000 rpm, separately excited d.c. motor has an armature resistance of 3 Ω. The motor is controlled by a stepdown chopper with a frequency of 1 kHz. The input d.c. voltage to the chopper is 230 V. The duty cycle of the chopper for the motor to operate at a speed of 500 rpm delivering the rated torque will be ________.

Question 5

For the circuit shown below, find the value of ΔV0, if duty ratio of switch is 0.4 and it is operated at 25 kHz?

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