Multiple Choice Questions and Answers on SCR
Multiple Choice Questions and Answers on SCR (Silicon Controlled Rectifiers)
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- Question Bank in Electronics & Communication Engineering by Prem R Chadha
- A Handbook on Electronics Engineering – Illustrated Formulae & Key Theory Concepts
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
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
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
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
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
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