SCR Sillicon Controlled Rectifiers Mcqs
Q.1: When SCR starts conducting, then _____________ loses all control?A
A. Gate
B. Cathode
C. Anode
D. None of the above
Q.2: 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
Q.3: If firing angle in an SCR circuit is increased, the output _____________?I
A. Remains the same
B. Is increased
C. Is decreased
D. None of the above
Q.4: We can control a.c. power in a load by connecting ______________?A
A. Two SCRs in series
B. Two SCRs in parallel
C. Two SCRs in parallel opposition
D. None of the above
Q.5: 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
Q.6: In an SCR circuit, the angle of conduction can be changed by__________________?O
A. Changing anode voltage
B. Changing gate voltage
C. Reverse biasing the gate
D. None of the above
Q.7: 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
Q.8: An SCR is turned off when ________________?+
A. Anode current is reduced to zero
B. Gate voltage is reduced to zero
C. Gate is reverse biased
D. None of the above
Q.9: An SCR has __________ pn junctions?#
A. Two
B. Three
C. Four
D. None of the above
Q.10: An SCR has ___________semiconductor layers?+
A. Two
B. Three
C. Four
D. None of the above

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