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Power Systems

Power Systems
A gas turbine power plant is best suited for

 Peak load.
 Emergency.
 None of these.
 Base load.

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Power Systems
The positive, negative and zero sequence per unit impedance of two generators connected in parallel are X1 = 0.12 pu, X2 = 0.096 pu and X0 = 0.036 pu. For LG fault at generator terminals (with 1 pu voltage) the positive sequence current will be

 9.936 pu
 8.936 pu
 10.936 pu
 7.936 pu

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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

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

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Power Systems
The steam power plant efficiency can be improved by

 decreasing the load on the plant.
 burning large amount of coal.
  using high temperature and high pressure steam.
 using large quantity of water.

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Power Systems
Which of the following method is used for changing power factor from leading to lagging

 any of the above
 shunt capacitor
 shunt reactor
 series capacitor

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Power Systems
For complete protection of 3-phase system from the short circuit faults minimum number of relays required are

 one
 six
 three
 two

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