A. voltage clamping device.
B. fuse.
C. heat sink.
D. snubber circuit.
Related Mcqs:
- Thyristor can be protected from over voltages by using
A. 23 mA.
B. 40 mA.
C. 10 mA.
D. 60 mA. - 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) - 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 - AC power in a load can be controlled by using____________?
A. Two SCR’s in parallel opposition
B. Two SCR’s in series
C. Three SCR’s in series
D. Four SCR’s in series - 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. - 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 - Gate circuit or triggering circuit of a thyristor is
A. lower power circuit.
B. high power circuit.
C. magnetic circuit.
D. may be low power or high power circuit - During which time maximum conduction spreading take place in the thyristor during turn ON?
A. Delay time
B. Spread time
C. Rise time
D. Same for every case - Typical range of thyristor turn OFF time is______________?
A. 3 – 10 µs
B. 3 – 50 µs
C. 3 – 100 µs
D. 3 – 500 µs - 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 %
