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Power Systems

Power Systems
The insulator thickness on the conductor, in cables depends upon

 power factor
 current
 reactive power
 voltage

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Power Systems
Condition for maximum voltage regulation

 cosφ = R/X
 tanφ = R/X
 cosφ = X/R
 tanφ = X/R

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Power Systems
Cheapest plant in operation and maintenance is

  diesel power.
  hydroelectric.
  steam power.
  nuclear.

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Power Systems
Gas turbine power plants for maximum efficient may have

 Multistage compression.
  All of above.
 Reheating.
 Heat exchangers.

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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.
 16.
 12.
  24.

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Power Systems
What should be the minimum depth (in metre)of cable trench to dug for laying of 1.1 kV?

 1.20.
 0.90.
 1.05.
  0.75.

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