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Power Systems

Power Systems
Units of incremental cost is

 RsMW/hr
 Rs/MWhr
 MWhr/Rs
 Rs/hr

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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
 2
 16

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Power Systems
The use of high speed circuit breakers

 increased the short circuit current.
 decrease system stability.
 reduces the short circuit current.
  improves system stability.

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Power Systems
The pu parameters for a 500 MVA machine on its own base are: Inertia, H = 20 pu; reactance X = 2 pu. The pu values of inertia and reactance on 100 MVA common base, respectively, are

 100, 0.4
 4, 10
 100, 10
 4, 0.4

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Power Systems
Zero sequence currents can flow from a line into a transformer bank if the windings are in

 delta / delta.
  ground star / delta.
 delta / star.
 star / grounded star.

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Power Systems
A transmission line has a surge impedance of 400 Ω is connected with the cable having surge impedance of 40 Ω, a surge magnitude of 100 kV is travelling from the transmission line towards the cable. Find the transmitted voltage?

 18.18 kV
 36. 36 kV
 30.6 Kv
 100 kV

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