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Power Systems

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

 three
 two
 one
 six

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Power Systems
The maximum efficiency of modern coal fired steam steam raising thermal power plants is restricted to about 0.35( a low value), mainly because of

 high energy loss in condenser
 high energy loss in boilers
 low alternator efficiency
 low steam turbine mechanical efficiency

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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

  5.
 10.
 20.
 55.1.

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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
For load flow studies, What are the quantities specified at load bus are

 P and V
 P and Q
 δ and Q
 V and δ

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Power Systems
A power station has a maximum demand of 15000 kW. The annual load factor is 50% and plant capacity factor is 40%. What is the reserve capacity of the plant?

 3000 kW
 3750 kW
 6000 kW
 7500 kW

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