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Power Systems

Power Systems
A string type insulator has three units with self capacitance C and ground capacitance of 0.2 C having a string efficiency of

 76%
 78%
 82%
 80%

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Power Systems
Example of base load stations are

  gas turbine.
  thermal.
  both A and B.
  hydro.

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Power Systems
An alternator having an induced emf of 1.6 pu is connected to an infinite bus of 1 pu. If the bus bar has reactance of 0.6 pu and alternator has reactance of 0.2 pu, what is the maximum power that can be transferred?

 2 pu
 2.67 pu
 5 pu
 6 pu

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Power Systems
The insulation resistance of the 20 km long underground cable is 8 MΩ. Other things being same, the insulation resistance of 10 km long cable will be

 4 MΩ
 16 MΩ
 8 MΩ
 32 MΩ

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Power Systems
A 3 core cable gives on test a capacitance of 3.7 µF between two cores. Find the line charging current of the cable when it is connected to 11 kV, 50 Hz system?

 1.476 A.
  14.76 A.
 1 A.
 14.7 mA.

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Power Systems
The area under a flow duration curve represents

 maximum rate of run-off during the period.
 total of units of energy available.
  total quantity of run-off during that period.
 total power available.

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