Power Electronics 60 thyrsistors are connected in series and parallel to form a 10 KV and 5.5 KA switch. Each thyristor is rated for 1.2 KV, 1 KA. The no. of parallel path are 6. The efficiency of the switch is 83.3 %. 91.6 %. 76.3 %. 90.9 %. 83.3 %. 91.6 %. 76.3 %. 90.9 %. ANSWER DOWNLOAD EXAMIANS APP
Power Electronics Which of the following is not a characteristic of UJT? Negative resistance Peak-point voltage Bilateral conduction Intrinsic stand off ratio Negative resistance Peak-point voltage Bilateral conduction Intrinsic stand off ratio ANSWER DOWNLOAD EXAMIANS APP
Power Electronics Between the peak point and the valley point of UJT emitter characteristics we have ___________ region Negative resistance None of these Cut-off Saturation Negative resistance None of these Cut-off Saturation ANSWER DOWNLOAD EXAMIANS APP
Power Electronics Let of a thyristor Vc1, Vc2, Vc3 are forward break over voltage for gate current Ig1, Ig2, Ig3 respectively. Then Vc1 > Vc2 > Vc3 when Ig1= Ig2 Vc1 > Vc2 > Vc3 when Ig1 < Ig2 < Ig3. Vc1 > Vc2 > Vc3 when Ig1 > Ig2 > Ig3. Vc1 = Vc2 = Vc3 any value of Ig. Vc1 > Vc2 > Vc3 when Ig1= Ig2 Vc1 > Vc2 > Vc3 when Ig1 < Ig2 < Ig3. Vc1 > Vc2 > Vc3 when Ig1 > Ig2 > Ig3. Vc1 = Vc2 = Vc3 any value of Ig. ANSWER DOWNLOAD EXAMIANS APP
Power Electronics In reverse blocking mode of a thyristor junction J1 and J2 is in forward bias and J3 is in reverse bias. junction J1, J3 is in reverse bias and J2 is in forward bias. junction J2 is in reverse bias and J1, J3 is in forward bias. junction J3 is in forward bias and J1, J2 in reverse bias. junction J1 and J2 is in forward bias and J3 is in reverse bias. junction J1, J3 is in reverse bias and J2 is in forward bias. junction J2 is in reverse bias and J1, J3 is in forward bias. junction J3 is in forward bias and J1, J2 in reverse bias. ANSWER DOWNLOAD EXAMIANS APP
Power Electronics When a large surge current of very short duration flows through a thyristor then which one of the following device will operate to protect the thyristor ? Fast acting current limiting device (FACL fuse). Snubber circuit. CB. Voltage clamping device. Fast acting current limiting device (FACL fuse). Snubber circuit. CB. Voltage clamping device. ANSWER DOWNLOAD EXAMIANS APP
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