Silicon Controlled Rectifiers Quiz | Silicon Controlled Rectifiers Objective Type Questions and Answers

(21) When SCR starts conducting, then ……………. loses all control

[A] Gate

[B] Cathode

[C] Anode

[D] None of the above

Answer: Gate

(22) We can control a.c. power in a load by connecting …………

[A] Two SCRs in series

[B] Two SCRs in parallel

[C] Two SCRs in parallel opposition

[D] None of the above

Answer: Two SCRs in parallel

(23) 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

Answer: Positive or negative half-cycles

(24) 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

Answer: Small leakage current

(25) If gate current is increased, then anode-cathode voltage at which SCR closes …………….

[A] Is decreased

[B] Is increased

[C] Remains the same

[D] None of the above

Answer: Is decreased