Multiple Choice ONLINE MCQ EE AND ECE–Thyristors (SCR) Part One

1. An SCR is a …… triggered device
(1) Voltage
(2) Current
(3) Voltage as well as current
(4) None of the above

Answer

2. In an SCR circuit, the supply voltage is generally ……… that of breakover voltage
(1) Equal to
(2) Less than
(3) Greater than
(4) None of the above

Answer

3. When an SCR is turned on, the voltage across it is about ……….
(1) zero
(2) 10 V
(3) 0.1 V
(4) 1V

Answer

4. An SCR is turned off when
(1) Anode current is reduced to zero
(2) Gate voltage is reduced to zero
(3) Gate is reverse biased
(4) None of the above

Answer

5. In an SCR circuit, the angle of conduction can be changed by
(1) Changing anode voltage
(2) Changing gate voltage
(3) Reverse biasing the gate
(4) None of the above

Answer

6. If firing angle is increased, then the output of an SCR
(1) Remains the same
(2) Is increased
(3) Is decreased
(4) None of the above

Answer

7. If gate current is increased, then anode-cathode voltage at which SCR turns ON
(1) is decreased
(2) is increased
(3) remains the same
(4) none of the above

Answer

8. An SCR has ……….. PN junctions.
(1) Two
(2) Three
(3) Four
(4) None of the above

Answer

9. An SCR has …….. semiconductor layers.
(1) Two
(2) Three
(3) Four
(4) None of the above

Answer

10. In AC supply,  an SCR can exercise control over
(1) Positive half-cycles only
(2) Negative half-cycles only
(3) Both positive and negative half-cycles
(4) Positive or negative half-cycles

Answer

11. AC power in a load can be controlled  by connecting
(1) Two SCRs in series
(2) Two SCRs in parallel
(3) Two SCRs in parallel opposition
(4) None of the above

Answer

12. When SCR starts conducting, which loses all control?
(1) Cathode
(2) Gate
(3) Anode
(4) None of the above

Answer

Thyristors (SCR) Part Two

Multiple Choice ONLINE MCQ EE AND ECE--Thyristors (SCR) Part Two
ELECTRICAL ENGINEERING GATE QUESTIONS AND SOLUTIONS KAPSULE OF KREATRYX GATE ONLINE COACHING INSTITUTES

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