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# ESE 2021 Technical Quiz || Commutation Techniques (App update required to attempt this test)

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Question 1

For also A commutation (Load commutation) the commutation circuit parametric L = 20 μH, C = 50 μF. For proper commutation what will be the value of load resistance

Question 2

In a current cumulated chopper, peak commutating current is twice that of the maximum possible load current. The source voltage is 250 V dc and main SCR take off time is 50 μs. Voltage is 250 V dc and main SCR taken off time is 50 μs. If maximum load current is 250 A, then peak capacitor voltage is………V.

Question 3

Class C commutation is shown in figure. Considering a safety factor of 2, what should be the value of capacitor C if the turn off time of both thyristors is 10μsecs? Question 4

In resonant pulse commutation, C = 30 μF and L = 5 μH. Initial voltage across capacitor = VS = VC = 240 V. If the constant load current of 240 A, then circuit then of time for main thyristor is______μsec.

Question 5

The circuit employing class C commutation, has Vs = 200 V, R1 = 60 Ω and R2 = 90 Ω. The peak value of current iT2 through thyristor is ……. A.
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