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 ? Snubber circuit. CB. Voltage clamping device. Fast acting current limiting device (FACL fuse). Snubber circuit. CB. Voltage clamping device. Fast acting current limiting device (FACL fuse). ANSWER DOWNLOAD EXAMIANS APP
Power Electronics CB used for over current protection of thyristor operates when the fault current is of long period. neither (A) nor (B). of short duration. both (A) and (B). of long period. neither (A) nor (B). of short duration. both (A) and (B). ANSWER DOWNLOAD EXAMIANS APP
Power Electronics A step up chopper has input voltage 110 V and output voltage 150 V. The value of duty cycle is 0.32. 0.67. 0.45. 0.27. 0.32. 0.67. 0.45. 0.27. ANSWER DOWNLOAD EXAMIANS APP
Power Electronics The V-I characteristics for a triac in the first and third quadrants are essentially identical to those of ___________ in its first quadrant SCR None of these UJT Transistor SCR None of these UJT Transistor ANSWER DOWNLOAD EXAMIANS APP
Power Electronics A string of n parallel SCRs is operated at 72 KA, the rating of each SCR is 1 KA. If derating factor of the string is 0.1. Then calculate the value of n 80. 70. 90. 60. 80. 70. 90. 60. ANSWER DOWNLOAD EXAMIANS APP
Power Electronics Practical way of obtaining static voltage equalization in series connected SCRs is by the use of resistors of the same value across each SCR. resistors of different values across each SCR. one resistor across the string. one resistor in series with each SCR. resistors of the same value across each SCR. resistors of different values across each SCR. one resistor across the string. one resistor in series with each SCR. ANSWER DOWNLOAD EXAMIANS APP
EXAMIANS