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Power Systems

Power Systems
Rating of fuse wire is expressed in

 ÃŽÂ©.
  Watts.
  Ampere.
  Mho.

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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

 16
 6
 2
 10

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Power Systems
For accurate load flow calculations on large power systems, the best method is

 N-R method
All of these
 Decoupled method
 G-S method

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Power Systems
In a 400 kV power network, 360 kV is recorded at 400 kV bus. The reactive power absorbed by a shunt reactor for 50 MVAr, 400 kV connected at the bus is

 55.56 MVAr.
 61.73 MVAr.
  40.5 MVAr.
 45.0 MVAr.

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Power Systems
A 1- phase transmission line operating at 30 kV has radius of 1 cm and distance between conductors is 0.5 m. Assume m = δ =1, g = 21 kV/cm and frequency f = 50 Hz. Find the critical disruptive voltage?

 17.32 kV/phase
 41.075 kV/phase
 82.15 kV/phase
 34.64 kV/phase

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Power Systems
For harnessing low variable water heads, the suitable hydraulic turbine with reaction and adjustable vanes is

 Impeller.
  Kaplan.
 Pelton.
 Francis.

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