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MCQs

Total Questions : 71 | Page 6 of 8 pages
Question 51.
  1.    current capacity
  2.    voltage drop
  3.    operating voltage
  4.    all of the mentioned
 Discuss Question
Answer: Option A. -> current capacity
Question 52. In India largest thermal power station is located at
  1.    Kota
  2.    Sarni
  3.    Chandrapur
  4.    Neyveli
 Discuss Question
Answer: Option C. -> Chandrapur
Question 53. When a line-to-line fault occurs, the short circuit current of an alternator depends upon its
  1.    Sub transient reactance
  2.    Transient reactance
  3.    Synchronous reactance
  4.    Short circuit reactance
 Discuss Question
Answer: Option C. -> Synchronous reactance
Question 54. The advantage of neutral earthing is
  1.    Freedom from persistent arcing grounds
  2.    Over voltages due to lightning can be discharged to earth
  3.    Simplified design earth fault protection
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 55. Base impedance of the power system is given as:
  1.    (Base kV)2/Base MVA
  2.    (Base kV)/Base MVA
  3.    Base MVA/(Base kV)2
  4.    None of these
 Discuss Question
Answer: Option A. -> (Base kV)2/Base MVA
Question 56. The generating voltage and frequency in India is about?
  1.    11 kV and 60 Hz
  2.    11 kV and 50 Hz
  3.    220 kV and 60 Hz
  4.    220 kV and 50 Hz
 Discuss Question
Answer: Option B. -> 11 kV and 50 Hz
Question 57. What are the terminal conditions in case of SLG fault, if the fault occurs in the phase A?
  1.    Vb = 0, Ia = 0, Ic = 0
  2.    Va = 0, Ib = 0, Ic = 0
  3.    Va = 0, Ia = 0, Ic = 0
  4.    Vb = 0, Ia = 0, Ib = 0
 Discuss Question
Answer: Option B. -> Va = 0, Ib = 0, Ic = 0
Question 58. Winds having following speed are suitable to operate wind turbines
  1.    5 – 25m/s
  2.    10 – 35m/s
  3.    20 – 45m/s
  4.    30 – 55m/s
 Discuss Question
Answer: Option A. -> 5 – 25m/s
Question 59. In overhead transmission lines the effect of capacitance can be neglected when the length of line is less than
  1.    200 km
  2.    160 km
  3.    100 km
  4.    80 km.
 Discuss Question
Answer: Option D. -> 80 km.
Question 60. What is the expression for fault current in line to line fault?
  1.    If = √3 * (Ea / Z1 + Z2)
  2.    If = 3 * (Ea / Z1 + Z2)
  3.    If = √3 * (Ea / Z1 + Z2 + Z0)
  4.    If = 3 * (Ea / Z1 + Z2 + Z05)
 Discuss Question
Answer: Option A. -> If = √3 * (Ea / Z1 + Z2)

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