Anode of an operational SCR is _______________?

Related Mcqs:

1. 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

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. Anode current in an SCR consists of____________?

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

4. 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

5. 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

6. 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

7. The typical value of SCR for modern alternator is____________?

   A. 1.5.
   B. 0.5.
   C. 1.0.
   D. 1.2.

8. How can we protect SCR from thermal conditions _____________?

   A. Use of snubber circuit.
   B. Using heat sink.
   C. Using CB and fuse.
   D. Using equalizing circuit

9. Maximum di / dt in a SCR is________?

   A. Directly proportional to Vm of supply voltage
   B. Inversely proportional to Vm of supply voltage
   C. Inversely proportional to L in the circuit
   D. Both A and C

10. 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