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Power Systems

Power Systems
In a 4 bus,4×4 Y bus matrix the number of non zero elements are 12. Find the number of transmission lines?

 2
 5
 4
 8

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Power Systems
In a thermal power plants, pressure in the working fluid cycle is developed by

  feed water pump.
 turbine.
 superheater.
 condenser.

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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
Advantage/s of per unit system as compare to absolute system?

 only one equation is required
 calculation time is less
All of these
 memory required is less

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Power Systems
The ratio of reset to pick up current for an induction cup relay is approximately

 0.75.
  0.99.
 1.0.
 1.35.

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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
 10
 16
 2

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