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MCQs

Total Questions : 206 | Page 17 of 21 pages
Question 161. Minimum arcing voltage will be least in case of
  1.    graphite
  2.    carbon
  3.    silver
  4.    tungsten
 Discuss Question
Answer: Option C. -> silver
Question 162. The transient voltage that appears across the contacts at the instant of arc extinction is called
  1.    peak voltage
  2.    recovery voltage
  3.    restriking voltage
  4.    supply voltage
 Discuss Question
Answer: Option C. -> restriking voltage
Question 163. The rating of a circuit breaker is generally determined on the basis of
  1.    symmetrical fault current
  2.    single line to ground fault current
  3.    double line to ground fault current
  4.    line to line fault current
 Discuss Question
Answer: Option A. -> symmetrical fault current
Question 164. In a circuit breaker the time duration from the instant of the fault to extinction of arc is known as
  1.    lag time
  2.    lead time
  3.    clearing time
  4.    operation time
 Discuss Question
Answer: Option C. -> clearing time
Question 165. The fuse wire, in DC circuit, is inserted in
  1.    negative circuit only
  2.    Both positive and negative circuit
  3.    positive circuit only
  4.    None of these
 Discuss Question
Answer: Option B. -> Both positive and negative circuit
Question 166. Which of the following is used in liquid fuses ?
  1.    sulphur hexafluoride
  2.    distilled water
  3.    carbon tetrachloride
  4.    transformer oil
 Discuss Question
Answer: Option C. -> carbon tetrachloride
Question 167. An isolator is installed
  1.    to operate the relay of circuit breaker
  2.    always independent of the position of circuit breaker
  3.    generally on both sides of a circuit breaker
  4.    as a substitute for circuit breaker
 Discuss Question
Answer: Option C. -> generally on both sides of a circuit breaker
Question 168. Admittance relay is
  1.    directional relay
  2.    None of these
  3.    impedance relay
  4.    non-directional relay
 Discuss Question
Answer: Option A. -> directional relay
Question 169. The torque produced in induction type relay is
  1.    inversely proportional to the square of the current
  2.    inversely proportional to the current
  3.    proportional to square of the current
  4.    proportional to the current
 Discuss Question
Answer: Option A. -> inversely proportional to the square of the current
Question 170. The material used for fuse must have
  1.    Low melting point and low specific resistance
  2.    low melting point and high specific resistance
  3.    high melting point and low specific resistance
  4.    low melting point and any specific resistance
 Discuss Question
Answer: Option B. -> low melting point and high specific resistance

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