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MCQs

Total Questions : 202 | Page 9 of 21 pages
Question 81. Example of a voltage clamping device
  1.      metal oxide varistor.
  2.     fast acting fuse.
  3.     snubber circuit.
  4.     aluminium block.
 Discuss Question
Answer: Option A. ->   metal oxide varistor.
Question 82. Under over voltage condition impedance offered by the voltage clamping device is
  1.     moderate.
  2.     high.
  3.     infinity.
  4.      low.
 Discuss Question
Answer: Option D. ->   low.
Question 83. Thyristor can be protected from over voltages by using
  1.     heat sink.
  2.     snubber circuit.
  3.     fuse.
  4.      voltage clamping device.
 Discuss Question
Answer: Option D. ->   voltage clamping device.
Question 84. The latching current of SCR is 20 mA. Its holding current will be
  1.     60 mA.
  2.     23 mA.
  3.     40 mA.
  4.      10 mA.
 Discuss Question
Answer: Option D. ->   10 mA.
Question 85. CB used for over current protection of thyristor operates when the fault current is
  1.     of short duration.
  2.     both (A) and (B).
  3.     neither (A) nor (B).
  4.      of long period.
 Discuss Question
Answer: Option D. ->   of long period.
Question 86. Under normal operating condition voltage clamping device offers impedance of
  1.      high value.
  2.     low value.
  3.     moderate value.
  4.     zero value.
 Discuss Question
Answer: Option A. ->   high value.
Question 87. How can we protect SCR from thermal conditions ?
  1.      Using heat sink.
  2.     Using CB and fuse.
  3.     Using equalizing circuit.
  4.     Use of snubber circuit.
 Discuss Question
Answer: Option A. ->   Using heat sink.
Question 88. What is used to protect the SCR from over current ?
  1.      CB and fuse.
  2.     Voltage clamping device.
  3.     Snubber circuit.
  4.     Heat sink.
 Discuss Question
Answer: Option A. ->   CB and fuse.
Question 89. When a large surge current of very short duration flows through a thyristor then which one of the following device will operate to protect the thyristor ?
  1.     Voltage clamping device.
  2.     CB.
  3.     Snubber circuit.
  4.      Fast acting current limiting device (FACL fuse).
 Discuss Question
Answer: Option D. ->   Fast acting current limiting device (FACL fuse).
Question 90. Which of the following is used in SCR to protect from high dV / dt?
  1.     Fuse.
  2.     Equalizing circuit.
  3.     Circuit breaker.
  4.      Snubber circuit.
 Discuss Question
Answer: Option D. ->   Snubber circuit.

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