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Power Systems

Power Systems
Length of the cable is doubled, its capacitance C will be

 doubled.
 one-fourth.
 one-half.
 unchanged.

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Power Systems
A coal fired steam power station working at a plant factor of 80% has one 500 MW generating unit. If the heat content of coal is 2 kWh/kg, the overall plant efficiency is 40% and a train load of coal is 2000 metric tons, then the number of trains required daily for the plant is

 6
 2
 10
 16

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

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

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Power Systems
The line current IR flowing into balanced delta connected load is - j5 - 3 A. If the phase sequence is RYB the phase current IYB is

 55.1.
  5.
 20.
 10.

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Power Systems
The term self GMD is used to calculate

 capacitance
 inductance
 resistance
 both 1 and 2

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Power Systems
Two insulator discs of identical capacitance value C make up a string for a 22 kV, 50 Hz, single phase overhead line insulation system. If pin to earth capacitance is also C, then find the string efficiency?

 86%%
 90%
 75%
 50%

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