A. < latching current but greater than holding current and gate signal is 0.
B. less than holding current.
C. < latching current but greater than holding current and gate signal is present.
D. both (A) and (B).
Related Mcqs:
- With gate open, the maximum anode current at which SCR is turned off from ON condition is called____________?
A. breakdown voltage
B. peak reverse voltage
C. holding current
D. latching current - The curve between V and I of SCR when anode is positive w.r.t cathode and when anode is negative w.r.t cathode are known as_____________________?
A. both as forward characteristics
B. both as reverse characteristics
C. former as forward characteristics and later as reverse characteristics
D. former as reverse characteristics and later as forward characteristics - Anode current in an SCR consists of____________?
A. holes only
B. electrons only
C. either electron or holes
D. Both electron and holes - Anode of an operational SCR is _______________?
A. Always positive w.r.t cathode
B. Always negative w.r.t anode
C. Always positive w.r.t anode
D. Always negative w.r.t cathode - The turn-on time of an SCR with inductive load is 20 µs. The puls train frequency is 2.5 KHz with a mark/space ratio of 1/10, then SCR will___________?
A. Turn on
B. Not turn on
C. Turn on if inductance is removed
D. Turn on if pulse frequency us increased to two times - If the anode current is 800 A, then the amount of current required to turn off the GTO is about____________?
A. 20 A
B. 200 A
C. 600 A
D. 400 A - An SCR has half cycle surge current rating of 3000 A for 50 Hz supply. One cycle surge current will be_____?
A. 1500 A.
B. 6000 A.
C. 2121.32 A.
D. 4242.64 A. - A thyristor string is made of a no. of SCR connected in series and parallel. The string have volume and current of 11 KV and 4 KA. The voltage and current rating of available SCRs are 1800 V and 1000 A. For a string efficiency of 90 % let the number of SCRs in series and parallel are a and b respectively. Then the value of a and b will be_____________?
A. 5, 7
B. 4, 6
C. 7, 5
D. 6, 4 - What is used to protect the SCR from over current ________________?
A. CB and fuse.
B. Heat sink.
C. Snubber circuit.
D. Voltage clamping device. - A GTO can be turned on by applying___________?
A. Positive gate signal
B. Positive drain signal
C. Positive source signal
D. None of these
