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MCQs

Total Questions : 25 | Page 2 of 3 pages
Question 11. The normal way to turn on a SCR is by ___________
  1.    Appropriate anode current
  2.    Appropriate gate current
  3.    None of the above
 Discuss Question
Answer: Option B. -> Appropriate gate current
Question 12. An SCR is 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
 Discuss Question
Answer: Option A. -> Reducing anode voltage to zero
Question 13. If firing angle in an SCR circuit is increased, the output ___________
  1.    Remains the same
  2.    Is increased
  3.    Is decreased
  4.    None of the above
 Discuss Question
Answer: Option C. -> Is decreased
Question 14. The control element of an SCR is ___________
  1.    Cathode
  2.    Anode
  3.    Anode supply
  4.    Gate
 Discuss Question
Answer: Option D. -> Gate
Question 15. When an SCR is turned on, the voltage across it is about ___________
  1.    Zero
  2.    10 V
  3.    1.5 V
  4.    1 V
 Discuss Question
Answer: Option D. -> 1 V
Question 16. An SCR has three terminals viz ___________
  1.    Cathode, anode, gate
  2.    Anode, cathode, grid
  3.    Anode, cathode, drain
  4.    None of the above
 Discuss Question
Answer: Option A. -> Cathode, anode, gate
Question 17. An SCR is made of silicon and not germanium because silicon
  1.    Is inexpensive
  2.    Is mechanically strong
  3.    Has small leakage current
  4.    Is tetravalent
 Discuss Question
Answer: Option C. -> Has small leakage current
Question 18. In an SCR circuit the supply voltage is generally ___________ that of breakover voltage
  1.    Equal to
  2.    Less than
  3.    Greater than
  4.    None of the above
 Discuss Question
Answer: Option B. -> Less than
Question 19. We can control a.c. power in a load by connecting ___________
  1.    Two SCRs in series
  2.    Two SCRs in parallel
  3.    Two SCRs in parallel opposition
  4.    None of the above
 Discuss Question
Answer: Option C. -> Two SCRs in parallel opposition
Question 20. An SCR is turned off when ___________
  1.    Anode current is reduced to zero
  2.    Gate voltage is reduced to zero
  3.    Gate is reverse biased
  4.    None of the above
 Discuss Question
Answer: Option A. -> Anode current is reduced to zero

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