MCQ on silicon controlled rectifier
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MCQ On Silicon Controlled Rectifier (SCR)

Posted on by Chetan Shidling

Hello Guys, welcome back to my blog. In this article, I will discuss MCQ on silicon controlled rectifier (SCR), the objective type questions related to silicon controlled rectifier.

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Also read – Power Electronics Questions And Answer.

MCQ On Silicon Controlled Rectifier

01. The Silicon Controlled Rectifier has …………….. how many PN junctions

  • 1. Two
  • 2. Three
  • 3. Four
  • 4. None of the above

ANS: 2

02. The Silicon Controlled Rectifier is the solid-state equivalent of …………….? 

  • 1. Triode
  • 2. Pentode
  • 3. Gas-filled triode
  • 4. Tetrode

ANS : 3

03. Silicon Controlled Rectifier has how many ………….. semiconductor layers

  • 1. Two
  • 2. Three
  • 3. Four
  • 4. None of the above

ANS : 3

04. Silicon Controlled Rectifier has three terminals, namely ……………

  • 1. Cathode, anode, gate
  • 2. Anode, cathode, grid
  • 3. Anode, cathode, drain
  • 4. None of the above

ANS: 1

05. Silicon Controlled Rectifier behaves as  ……………. switch

  • 1. A Unidirectional
  • 2. A Bidirectional
  • 3. A Mechanical
  • 4. None of the above

ANS: 1

06. Silicon Controlled Rectifier is also called as …………

  • 1. Triac
  • 2. Diac
  • 3. Unijunction transistor
  • 4. Thyristor

ANS: 4

07. Silicon Controlled Rectifier is made up of …………. 

  • 1. Germanium
  • 2. Silicon
  • 3. Carbon
  • 4. None of the above

ANS: 2

08. In the operation of a Silicon Controlled Rectifier, the anode is …………… w.r.t. cathode

  • 1. At zero potential
  • 2. Negative
  • 3. Positive
  • 4. None of the above

ANS : 3

09. In the normal operation of a Silicon Controlled Rectifier, the gate is ………..w.r.t. cathode

  • 1. Positive
  • 2. Negative
  • 3. At zero potential
  • 4. None of the above

ANS: 1

10. Silicon Controlled Rectifier combines the features of ………….. \

  • 1. A rectifier and resistance
  • 2. A rectifier and transistor
  • 3. A rectifier and capacitor
  • 4. None of the above

ANS: 2

11. A control element of a Silicon Controlled Rectifier is …………. 

  • 1. Cathode
  • 2. Anode
  • 3. Anode supply
  • 4. Gate

ANS: 4

12. The normal way to turn on a Silicon Controlled Rectifier is by the …………….. 

  • 1. Breakover voltage
  • 2. Appropriate anode current
  • 3. Appropriate gate current
  • 4. None of the above

ANS : 3

13. Silicon Controlled Rectifier can be turned off by ……………. 

  • 1. Reducing anode voltage to zero
  • 2. Reducing gate voltage to zero
  • 3. Reverse biasing the gate
  • 4. None of the above

ANS: 1

14. Silicon Controlled Rectifier is ……………….. triggered device

  • 1. Voltage
  • 2. Current
  • 3. Voltage as well as current
  • 4. None of the above

ANS: 2

15. In Silicon Controlled Rectifier circuit the supply voltage is ……….. that of a break over voltage

  • a. Equal to
  • b. Less than
  • c. Greater than
  • d. None of the above

ANS: b

16. When the Silicon Controlled Rectifier is turn on, the voltage across it is equal to ………. 

  • a. 10 V
  • b. 15 V
  • c. 0 V
  • d. 1 V

ANS : d

17. Silicon Controlled Rectifier is made up of silicon but no germanium is used because of silicon………?

  • a. It is inexpensive
  • b. It is mechanically strong
  • c. Has small leakage current
  • d. Is tetravalent

ANS: c

18. Silicon Controlled Rectifier is turn off when …………..? 

  • a. Anode current is reduced to zero
  • b. The gate voltage is reduced to zero
  • c. Gate is reverse biased
  • d. None of the above

ANS: a

19. Silicon Controlled Rectifier circuit, the angle of the conduction can be changed by?

  • a. Changing anode voltage
  • b. Changing gate voltage
  • c. Reverse biasing the gate.
  • d. None of the above

ANS: b

20. If the firing angle in a Silicon Controlled Rectifier circuit is increased, the output …………

  • a. Remains the same
  • b. It is increased
  • c. It is decreased
  • d. None of the above

ANS: c

21. If the gate current is increased, then the anode-cathode voltage at which Silicon Controlled Rectifier closes ……………. 

  • a. It is decreased
  • b. It is increased
  • c. Remains the same
  • d. None of the above

ANS: a

22. When Silicon Controlled Rectifier is OFF, the current in a circuit is ……………. 

  • a. Exactly zero
  • b. Small leakage current
  • c. Large leakage current
  • d. None of the above

ANS: b

23. Silicon Controlled Rectifier can exercise the control over ………. of the 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

ANS: a

24. AC power in a load can be controlled by connecting …………

  • a. Two SCRs in series
  • b. Two SCRs in parallel
  • c. Two SCRs in parallel opposition
  • d. None of the above

ANS: c

25. When the Silicon Controlled Rectifier starts conducting, then ……………. will lose all control

  • a. Gate
  • b. Cathode
  • c. Anode
  • d. None of the above

ANS: a

I hope this article may help you all a lot. Thank you for reading.

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