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GATE 2019: Power Electronics Quiz 6 (App update required to attempt this test)
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Question 1
What will be the peak current through main thyristor in a voltage commutated chopper circuit if the source voltage is 250V with constant load current of 10A and L=0.2mH and C= 20 µF?
Question 2
In the given chopper circuit, when the switch is held open, the inductor current 
:
: Question 3
The given figure shows a step-down dc chopper. A freewheeling diode is placed across the load. The load current varies between 9A to 15A. The value of resistance is 5Ω then time ratio 
would be
would be Question 4
A step-up chopper is used to feed a load at 400 V dc from a 250 V dc source. The inductor current is continuous. If the ‘off’ time of the switch is 20μs, the switching frequency of the chopper is kHz is __________.
Question 5
For type A chopper circuit with dc supply voltage 230 V , chopping period T = 1800 Ns, on period = 500 Ns ; load circuit parameters : R=1 Ω, L=5mH & E=24 V, the duty cycle ‘δ’ where the limit of continuous current conduction is reached will be
Question 6
The circuit in the figure is a current commutated dc – dc chopper where. ThM is the main SCR and ThAUX is the auxiliary SCR. The load current is constant at 10 A. ThM is ON. ThAUX is triggered at t = 0. ThM is turned OFF between
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Sep 15ESE & GATE EE
