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Power Systems

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

 0.90.
 1.05.
 1.20.
  0.75.

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Power Systems
Which of following power plants is free from environmental problem

 Diesel engine.
  Hydroelectric.
 Steam.
 Nuclear.

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Power Systems
Maximum power transfer in a transmission line can be obtained by

 increasing voltage level
 either 1 or 2
None of these
 reducing reactance

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Power Systems
If the breakdown voltage of the insulator is high, the thickness of the insulator is

None of these
 high
 less
 it does not related to breakdown voltage

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Power Systems
The load current in short circuit calculations are neglected because

 short circuit currents are much larger than load currents
 both 1 and 2
 nether 1 nor 2
 short circuit currents are greatly out of phase with load currents

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Power Systems
An ACSR conductor has a diameter of 2 cm has internal inductance of 0.05 mH/Km. If this ACSR is replaced with another having a diameter of 4 cm then its internal inductance is

 0.05 mH/Km
 0.1 mH/Km
 0 mH/Km
 0.025 mH/Km

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