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MCQs

Total Questions : 206 | Page 15 of 21 pages
Question 141. The relay operating coil is supplied through
  1.    None of these
  2.    fuse
  3.    current transformer
  4.    power transformer
 Discuss Question
Answer: Option C. -> current transformer
Question 142. SF 6 gas
  1.    is lighter than air
  2.    Is nontoxic
  3.    is yellow in colour
  4.    has pungent small
 Discuss Question
Answer: Option B. -> Is nontoxic
Question 143. Relay can be designed to respond to changes in
  1.    All of these
  2.    temperature
  3.    resistance, reactance and impedance
  4.    voltage and current
 Discuss Question
Answer: Option A. -> All of these
Question 144. Arc in a circuit breaker behaves as
  1.    a resistance increasing with voltage rise across the arc
  2.    an inductive reactance
  3.    a capacitive reactance
  4.    a resistance decreasing with voltage rise across the arc
 Discuss Question
Answer: Option D. -> a resistance decreasing with voltage rise across the arc
Question 145. The arcing contacts in a circuit breaker are made of
  1.    electrolytic copper
  2.    copper tungsten alloy
  3.    aluminium alloy
  4.    porcelain
 Discuss Question
Answer: Option B. -> copper tungsten alloy
Question 146. With which of the following, a circuit breaker must be equipped for remote operation ?
  1.    shunt trip
  2.    time-delay trip
  3.    None of these
  4.    inverse time trip
 Discuss Question
Answer: Option A. -> shunt trip
Question 147. Dc shunt relays are made of
  1.    many turns of thick wire
  2.    few turns of thick wire
  3.    few turns of thin wire
  4.    many turns of thin wire
 Discuss Question
Answer: Option D. -> many turns of thin wire
Question 148. The relay operating speed depends upon
  1.    All of these
  2.    the rate of flux built up
  3.    the spring tension
  4.    armature core air gap
 Discuss Question
Answer: Option A. -> All of these
Question 149. Circuit breakers usually operate under
  1.    after dc component has ceased
  2.    sub-transient state of short circuit current
  3.    transient state of short circuit current
  4.    steady state of short circuit current
 Discuss Question
Answer: Option C. -> transient state of short circuit current
Question 150. Air blast circuit breaker is used for
  1.    short duty
  2.    repeated duty
  3.    intermittent duty
  4.    over currents
 Discuss Question
Answer: Option B. -> repeated duty

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