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Power Systems

Power Systems
Lightning arresters are made up of which material?

 silicon oxide
 any of the above
 copper
 silver

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Power Systems
A string insulator has 4 units. The voltage across bottom most unit is 10 kV and its efficiency is 90%. Find the total operating phase voltage?

 36 kV
 32 kV
 40 kV
 45 kV

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Power Systems
To prevent maloperation of deferentially connected relay while energizing a transformer, the relay restraining coil is biased with

 2nd harmonic current.
 7th harmonic current.
  5th harmonic current.
 3rd harmonic current.

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Power Systems
For large plants of capacity for more than 15 MW, what type of cooling is used

  Liquid.
  Hydrogen.
  Water.
  Air.

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Power Systems
A hydraulic turbine having rated speed of 250 rpm is connected to a synchronous generator. In order to produce power at 50 Hz, the numbers of pole are required in the generator

 6.
 12.
  24.
 16.

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Power Systems
With reference to hydrometer station, the graphical representation of the discharge as function of time is known as

 Hectograph.
 Monograph.
 Load duration curve.
  Hydro-graph.

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