An SCR is made up of silicon because_____________?

Related Mcqs:

1. 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

2. A silicon controlled racitifier (SCR) is a ____________?

   A. Unijunction device
   B. Device with three junction
   C. Device with four junction
   D. None of the above

3. An SCR is made up of silicon because?

   A. silicon has large leakage current than germanium
   B. silicon has small leakage current than germanium
   C. silicon has small leakage voltage than germanium
   D. silicon has large leakage voltage than germanium

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

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

5. 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

6. Which of the following is used in SCR to protect from high dV / dt__________________?

   A. Snubber circuit
   B. Fuse
   C. Equalizing circuit
   D. Circuit breaker

7. 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

8. A string of n parallel SCRs is operated at 72 KA, the rating of each SCR is 1 KA. If derating factor of the string is 0.1. value of n will be___________?

   A. 60
   B. 70
   C. 80
   D. 90

9. 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

10. 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