An SCR has ___________semiconductor layers?

Related Mcqs:

1. An SCR can exercise control over____________of a.c. supply?

   A. Positive half-cycles only
   B. Negative half-cycles only
   C. Both positive and negative half-cycles
   D. Positive or negative half-cycles

2. When SCR is OFF, the current in the circuit is ________________?

   A. Exactly zero
   B. Small leakage current
   C. Large leakage current
   D. None of the above

3. An SCR is made of_______________?

   A. Germanium
   B. Silicon
   C. Carbon
   D. None of the above

4. An SCR has three terminals viz ________________?

   A. Cathode, anode, gate
   B. Anode, cathode, grid
   C. Anode, cathode, drain
   D. None of the above

5. An SCR is a solid state equivalent of ______________?

   A. Triode
   B. Pentode
   C. Gas-filled triode
   D. Tetrode

6. In the normal operation of an SCR, anode is __________ w.r.t. cathode?

   A. At zero potential
   B. Negative
   C. Positive
   D. None of the above

7. When an SCR is turned on, the voltage across it is about _____________?

   A. Zero
   B. 10 V
   C. 1 V
   D. 1 V

8. An SCR is a ____________ triggered device?

   A. Voltage
   B. Current
   C. Voltage as well as current
   D. None of the above

9. An SCR is turned off by _________________?

   A. Reducing anode voltage to zero
   B. Reducing gate voltage to zero
   C. Reverse biasing the gate
   D. None of the above

10. The control element of an SCR is ______________?

    A. Cathode
    B. Anode
    C. Anode supply
    D. Gate