A. Delay time
B. Spread time
C. Rise time
D. Same for every case
Related Mcqs:
- The capacitance of reversed bised junction J2 in a thyristor is CJ2 = 20 pF and can be assumed to be independant of the off state voltage. The limiting value of the charging current to turn on the thyristor is 16 mA. What is the critical value of dv/dt?
A. 600 V/µs
B. 800 V/µs
C. 1200 V/µs
D. 1000 V/µs - 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 ___________?
A. CB
B. Snubber circuit
C. Voltage clamping device
D. Fast acting current limiting device (FACL fuse) - Typical range of thyristor turn OFF time is______________?
A. 3 – 10 µs
B. 3 – 50 µs
C. 3 – 100 µs
D. 3 – 500 µs - A thyristor equivalent of a thyratron tube is a _________?
A. Diac
B. Triac
C. Silicon controlled-rectifier SCR
D. None of above - If holding current of a thyristor is 2 mA then latching current should be_____?
A. 0.01 A.
B. 0.002 A.
C. 0.009 A.
D. 0.004 A. - Thyristor can be protected from over voltages by using____________?
A. voltage clamping device.
B. fuse.
C. heat sink.
D. snubber circuit. - Leakage current flows through the thyristor in_________?
A. forward blocking mode
B. reverse blocking mode
C. both forward and reverse blocking mode
D. forward conduction mode - Let of a thyristor Vc1, Vc2, Vc3 are forward break over voltage for gate current Ig1, Ig2, Ig3 respectively. Then________________?
A. Vc1 > Vc2 > Vc3 when Ig1 > Ig2 > Ig3.
B. Vc1 > Vc2 > Vc3 when Ig1 < Ig2 < Ig3.
C. Vc1 = Vc2 = Vc3 any value of Ig.
D. Vc1 > Vc2 > Vc3 when Ig1 ≥ Ig2 &Atil - A thyristor can termed as__________?
A. AC switch
B. DC switch
C. Both a and B
D. Square wave switch - 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______________________?
A. 76.3 %
B. 91.6 %
C. 83.3 %
D. 90.9 %
