The maximum di/dt in a SCR is____________?

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. The typical value of SCR for modern alternator is____________?

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

3. Number of PN junction in an SCR is____________?

   A. Two
   B. Three
   C. Four
   D. Five

4. 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

5. 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

6. 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

7. The function of snubber circuit connected across the SCR is to___________?

   A. Suppress dV / dt.
   B. Increase dV / dt.
   C. Decrease dV / dt.
   D. Decrease di / dt.

8. What is used to protect the SCR from over current ________________?

   A. CB and fuse.
   B. Heat sink.
   C. Snubber circuit.
   D. Voltage clamping device.

9. ON state voltage drop across SCR lie between the range_____________?

   A. 0 – 0.5 V.
   B. 0.5 – 1 V.
   C. 1 – 1.5 V.
   D. 1.5 – 2 V.

10. 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