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MCQs

Total Questions : 222 | Page 7 of 23 pages
Question 61. A booster is a
  1.    Series wound generator
  2.    Shunt wound generator
  3.    Synchronous generator
  4.    None of the above
 Discuss Question
Answer: Option A. -> Series wound generator
Question 62. The effect of corona can be detected by
  1.    Presence of ozone detected by odour
  2.    Hissing sound
  3.    Faint luminous glow of bluish color
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 63. High voltage transmission lines use
  1.    Suspension insulators
  2.    Pin insulators
  3.    Both (A) and (B)
  4.    None of the above
 Discuss Question
Answer: Option A. -> Suspension insulators
Question 64. In a D.C. 3-wire distributor using balancers and having unequal loads on the two sides
  1.    both balancers run as generators
  2.    both balancers run as motors
  3.    balancer connected to lightly- loaded side runs as a motor
  4.    balancer connected to heavily- loaded side runs as a motor
 Discuss Question
Answer: Option C. -> balancer connected to lightly- loaded side runs as a motor
Question 65. Which of the following is the demerit of a 'constant voltage transmission system' ?
  1.    Increase of short-circuit current of the system
  2.    Availability of steady voltage at all loads at the line terminals
  3.    Possibility of better protection for the line due to possible use of higher terminal reactants
  4.    Improvement of power factor at times of moderate and heavy loads
  5.    Possibility of carrying increased power for a given conductor size in case of long-distance heavy power transmission
 Discuss Question
Answer: Option A. -> Increase of short-circuit current of the system
Question 66. Due to which of the following reasons the cables should not be operated too hot?
  1.    The oil may loose its viscosity and it may start drawing off from higher levels
  2.    Expansion of the oil may cause the sheath to burst
  3.    Unequal expansion may create voids in the insulation which will lead to ionization
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 67. When an alternator connected to the bus-bar is shut down the bus-bar voltage will
  1.    Fall
  2.    Rise
  3.    Remain unchanged
  4.    None of the above
 Discuss Question
Answer: Option C. -> Remain unchanged
Question 68. Multi-core cables generally use
  1.    Square conductors
  2.    Circular conductors
  3.    Rectangular conductors
  4.    None of the above
 Discuss Question
Answer: Option D. -> None of the above
Question 69. The corona is considerably affected by which of the following?
  1.    Size of the conductor
  2.    Shape of the conductor
  3.    Surface condition of the conductor
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 70. Transmission voltage of ll kV is normally used for distances upto
  1.    20 - 25 km
  2.    40 - 50 km
  3.    60 - 70 km
  4.    80 - 100 km
 Discuss Question
Answer: Option A. -> 20 - 25 km

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