Silicon Controlled Rectifiers MCQ
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Attempt Free Silicon Controlled Rectifiers MCQ Here. Read The Important Electricity MCQ From Below.
Q1. An SCR has …………….. pn junctions
Two
Three
Four
None of the above
Answer : 2
Q2. An SCR is a solid state equivalent of …………….
Triode
Pentode
Gas-filled triode
Tetrode
Answer : 3
Q3. An SCR has ………….. semiconductor layers
Two
Three
Four
None of the above
Answer : 3
Q4. An SCR has three terminals viz ……………
Cathode, anode, gate
Anode, cathode, grid
Anode, cathode, drain
None of the above
Answer : 1
Q5. An SCR behaves as a ……………. switch
Unidirectional
Bidirectional
Mechanical
None of the above
Answer : 1
Silicon Controlled Rectifiers MCQ
Q6. An SCR is sometimes called …………
Triac
Diac
Unijunction transistor
Thyristor
Answer : 4
Q7. An SCR is made of ………….
Germanium
Silicon
Carbon
None of the above
Answer : 2
Q8. In the normal operation of an SCR, anode is …………… w.r.t. cathode
At zero potential
Negative
Positive
None of the above
Answer : 3
Q9. In normal operation of an SCR, gate is ………..w.r.t. cathode
Positive
Negative
At zero potential
None of the above
Answer : 1
Q10. An SCR combines the features of …………..
A rectifier and resistance
A rectifier and transistor
A rectifier and capacitor
None of the above
Answer : 2
Silicon Controlled Rectifiers MCQ
Q11. The control element of an SCR is ………….
Cathode
Anode
Anode supply
Gate
Answer : 4
Q12. The normal way to turn on a SCR is by ……………..
Breakover voltage
Appropriate anode current
Appropriate gate current
None of the above
Answer : 3
Q13. An SCR is turned off by …………….
Reducing anode voltage to zero
Reducing gate voltage to zero
Reverse biasing the gate
None of the above
Answer : 1
Q14. An SCR is a ……………….. triggered device
Voltage
Current
Voltage as well as current
None of the above
Answer : 2
Q15. In an SCR circuit the supply voltage is generally ……….. that of breakover voltage
Equal to
Less than
Greater than
None of the above
Answer : 2
Silicon Controlled Rectifiers MCQ
Q16. When an SCR is turned on, the voltage across it is about ……….
Zero
10 V
1 V
1 V
Answer : 4
Q17. An SCR is made of silicon and not germanium because silicon ………
Is inexpensive
Is mechanically strong
Has small leakage current
Is tetravalent
Answer : 3
Q18. An SCR is turned off when …………..
Anode current is reduced to zero
Gate voltage is reduced to zero
Gate is reverse biased
None of the above
Answer : 1
Q19. In an SCR circuit, the angle of conduction can be changed by ……….
Changing anode voltage
Changing gate voltage
Reverse biasing the gate
None of the above
Answer : 2
Silicon Controlled Rectifiers MCQ
Q20. If firing angle in an SCR circuit is increased, the output …………
Remains the same
Is increased
Is decreased
None of the above
Answer : 3
Q21. If gate current is increased, then anode-cathode voltage at which SCR closes …………….
Is decreased
Is increased
Remains the same
None of the above
Answer : 1
Q22. When SCR is OFF, the current in the circuit is …………….
Exactly zero
Small leakage current
Large leakage current
None of the above
Answer : 2
Q23. An SCR can exercise control over ………. of a.c. supply
Positive half-cycles only
Negative half-cycles only
Both positive and negative half-cycles
Positive or negative half-cycles
Answer : 4
Q24. We can control a.c. power in a load by connecting …………
Two SCRs in series
Two SCRs in parallel
Two SCRs in parallel opposition
None of the above
Answer : 3
Q25. When SCR starts conducting, then ……………. loses all control
Gate
Cathode
Anode
None of the above
Answer : 1
Silicon Controlled Rectifiers MCQ
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