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MCQs

Total Questions : 206 | Page 16 of 21 pages
Question 151. Directional relay are based on flow of
  1.    power
  2.    current
  3.    voltage wave
  4.    All of these
 Discuss Question
Answer: Option A. -> power
Question 152. When transmission line is energized, the wave that propagates on it is
  1.    both current wave and voltage wave
  2.    power factor wave only
  3.    voltage wave only
  4.    current wave only
 Discuss Question
Answer: Option A. -> both current wave and voltage wave
Question 153. The voltage appearing across the contacts after opening of the circuit breaker is called
  1.    operating voltage
  2.    arc voltage
  3.    surge voltage
  4.    recovery voltage
 Discuss Question
Answer: Option D. -> recovery voltage
Question 154. HRC fuses provide best protection against
  1.    open circuits
  2.    reverse current
  3.    short circuits
  4.    overload
 Discuss Question
Answer: Option C. -> short circuits
Question 155. Insulation resistance of high voltage circuit breakers is more than
  1.    10 mega ohms
  2.    500 mega ohms
  3.    1 mega ohms
  4.    100 mega ohms
 Discuss Question
Answer: Option D. -> 100 mega ohms
Question 156. The time of closing the cycle, in modern circuit breakers is
  1.    0.001 sec
  2.    0.01 sec
  3.    0.003 sec
  4.    0.10 sec
 Discuss Question
Answer: Option C. -> 0.003 sec
Question 157. The arc voltage produced in AC circuit breaker is always
  1.    In phase with the arc current
  2.    leading the arc current by 90°
  3.    None of these
  4.    lagging the arc current by 90°
 Discuss Question
Answer: Option A. -> In phase with the arc current
Question 158. Which of the following is the least expensive protection for over current is low voltage system ?
  1.    air break circuit breaker
  2.    oil circuit breaker
  3.    isolator
  4.    rewireable fuse
 Discuss Question
Answer: Option D. -> rewireable fuse
Question 159. Outdoor switchgear is generally used for voltage beyond
  1.    66 kV
  2.    33 kV
  3.    11 kV
  4.    132 kV
 Discuss Question
Answer: Option A. -> 66 kV
Question 160. Breaking capacity of a circuit breaker is usually expressed in terms of
  1.    amperes
  2.    MVA
  3.    volts
  4.    Mw
 Discuss Question
Answer: Option B. -> MVA

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