GATE 2021 : Power Electronics Rapid Quiz 2 (App update required to attempt this test)
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A dc to dc converter chopper supplied from a dc voltage feed resistive inductive load with a free-wheeling diode.
Without changing the value of average dc current through load. If it is desired to reduce the ripple content in load current, the control action must be:
In a voltage commutation chopper circuit, the chopper operates at 400Hz and 50% duty cycle. The load current remains ripple free at 10 A. Assuming input voltage to be 250 V and commutating inductance and capacitance of 1 mH and 5µF. The turn off time of thyristor will be:
A type A chopper is fed from a 200 V source. This chopper is connected to RLE load with R= 0 Ω, L = 3.5 mH and constant battery E. For a duty cycle of 0.4. If the chopping frequency to limit the amplitude of load current to 10 A. Find the time period for which freewheeling diode is conducted.
For the load requirement of constant Current of 25 Amp, a voltage commutated chopper is designed with commutation circuit specification of 50μF, 20μH & Ton time of 600μsec which is supplied by input voltage of 230V DC. The effective ON period of the circuit is ____sec. (Answer upto 4 decimal places)
In the circuit shown in the figure the diode D is assumed to be ideal. The switch is opened at t = 0 prior to that the inductor carriers an initial current. The voltage waveform across the inductor is
A single phase diode bridge rectifier supplies a highly inductive load such that the load current of 25A is ripple free. Input to the rectifier is 230V, 50Hz through a transformer of unity turns ratio. The input power factor of the rectifier is