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MCQs

Total Questions : 206 | Page 5 of 21 pages
Question 41. Air blast circuit breaker is used for
  1.    over currents
  2.    short duty
  3.    intermittant duty
  4.    repeated duty
 Discuss Question
Answer: Option D. -> repeated duty
Question 42. The inductive interference between power and communication line can be minimized by
  1.    transposition of the power line
  2.    transposition of the communication line
  3.    both (A) and (B)
  4.    increasing the distance between the conductors
 Discuss Question
Answer: Option C. -> both (A) and (B)
Question 43. A thermal protection switch can protect against
  1.    short-circuit
  2.    temperature
  3.    overload
  4.    over voltage
 Discuss Question
Answer: Option C. -> overload
Question 44. Thermal circuit breaker has
  1.    delayed trip action
  2.    instantaneous trip action
  3.    both of the above
  4.    none of the above
 Discuss Question
Answer: Option A. -> delayed trip action
Question 45. Transmission line has reflection coefficient as one.
  1.    Open circuit
  2.    Short-circuit
  3.    Long
  4.    None of the above
 Discuss Question
Answer: Option A. -> Open circuit
Question 46. The time of closing the cycle, in modern circuit breakers is
  1.    0.003 sec
  2.    0.001 sec
  3.    0.01 sec
  4.    0.10 sec
  5.    none of the above
 Discuss Question
Answer: Option A. -> 0.003 sec
Question 47. Short-circuit currents are due to
  1.    single phase to ground faults
  2.    phase to phase faults
  3.    two phase to ground faults
  4.    three phase faults
  5.    any of these
 Discuss Question
Answer: Option E. -> any of these
Question 48. Resistance grounding is used for voltage between
  1.    33kV to 66kV
  2.    22kV to 33kV
  3.    3.3kV and llkV
  4.    none of the above
 Discuss Question
Answer: Option C. -> 3.3kV and llkV
Question 49. Discrimination between main and back up protection is provided by the use of relays which are
  1.    fact
  2.    sensitive
  3.    slow
  4.    none of the above
 Discuss Question
Answer: Option C. -> slow
Question 50. Thermal overload relays are used to protect the motor against over current due to
  1.    short-circuits
  2.    heavy loads
  3.    grounds
  4.    all of the above
 Discuss Question
Answer: Option B. -> heavy loads

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