Silicon Controlled Rectifiers MCQ Questions & Answers | Electrical Engineering Page-2 section-1

11.
The normal way to turn on a SCR is by ___________

A. Breakover voltage

B. Appropriate anode current

C. Appropriate gate current

D. None of the above

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12.
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

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13.
If firing angle in an SCR circuit is increased, the output ___________

A. Remains the same

B. Is increased

C. Is decreased

D. None of the above

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14.
When an SCR is turned on, the voltage across it is about ___________

A. Zero

B. 10 V

C. 1.5 V

D. 1 V

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15.
The control element of an SCR is ___________

A. Cathode

B. Anode

C. Anode supply

D. Gate

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16.
An SCR has three terminals viz ___________

A. Cathode, anode, gate

B. Anode, cathode, grid

C. Anode, cathode, drain

D. None of the above

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17.
An SCR is made of silicon and not germanium because silicon

A. Is inexpensive

B. Is mechanically strong

C. Has small leakage current

D. Is tetravalent

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18.
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

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19.
In an SCR circuit the supply voltage is generally ___________ that of breakover voltage

A. Equal to

B. Less than

C. Greater than

D. None of the above

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20.
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

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Silicon Controlled Rectifiers MCQ Questions & Answers | Electrical Engineering

11. The normal way to turn on a SCR is by ___________

Answer & Solution

12. An SCR is turned off by ___________

Answer & Solution

13. If firing angle in an SCR circuit is increased, the output ___________

Answer & Solution

14. When an SCR is turned on, the voltage across it is about ___________

Answer & Solution

15. The control element of an SCR is ___________

Answer & Solution

16. An SCR has three terminals viz ___________

Answer & Solution

17. An SCR is made of silicon and not germanium because silicon

Answer & Solution

18. We can control a.c. power in a load by connecting ___________

Answer & Solution

19. In an SCR circuit the supply voltage is generally ___________ that of breakover voltage

Answer & Solution

20. An SCR is turned off when ___________

Answer & Solution

11.
The normal way to turn on a SCR is by ___________

12.
An SCR is turned off by ___________

13.
If firing angle in an SCR circuit is increased, the output ___________

14.
When an SCR is turned on, the voltage across it is about ___________

15.
The control element of an SCR is ___________

16.
An SCR has three terminals viz ___________

17.
An SCR is made of silicon and not germanium because silicon

18.
We can control a.c. power in a load by connecting ___________

19.
In an SCR circuit the supply voltage is generally ___________ that of breakover voltage

20.
An SCR is turned off when ___________