With gate open, the maximum anode current at which SCR is turned off from ON condition is called____________?

Related Mcqs:

1. For an SCR gate – cathode characteristic is a straight line of 130. For triggered source volume of 15 V and allowable gate power dissipation of 0.5 W compute the gate source resistance_____?

   A. 111.9 Ω.
   B. 11.19 Ω.
   C. 108 Ω.
   D. 115 Ω

2. SCR will be turned off when anode current is_______________?

   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).

3. 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

4. Anode current in an SCR consists of____________?

   A. holes only
   B. electrons only
   C. either electron or holes
   D. Both electron and holes

5. 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

6. 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

7. If the gate voltage of an SCR is removed, then the_______________?

   A. anode current decreases
   B. anode current does not decrease at all
   C. anode current increases
   D. cathode current increases

8. 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

9. 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.

10. 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