MCQ On Silicon Controlled Rectifier (SCR)

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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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