Silicon Controlled Rectifiers Objective Type Questions and Answers

Questions

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

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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

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