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Power Systems

Power Systems
Plant capacity factor value is

 0
 less than 1
 1
 greater than 1

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Power Systems
A generator has reactances of sub transient (X")= 0.5 pu, transient (X') = 0.8 pu and synchronous reactance (X) = 5 pu. The voltages at these reactances are 1.2 V, 1.1 V and 1 V respectively. Find the corresponding sub transient fault current in pu?

 1.375 pu
 0.2 pu
 3.975 pu
 2.4 pu

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Power Systems
The insulator thickness on the conductor, in cables depends upon

 voltage
 reactive power
 power factor
 current

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Power Systems
If the percentage reactance of an element is 20 % and the full load current is 50 Amp, the short circuit current will be

  250 Amp.
 200 Amp.
 350 Amp.
 300 Amp.

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Power Systems
Isolator in sub station is open under ------------- condition?

 no load
 any of the above
 full load
 short circuit

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Power Systems
A generator has a rating of 10 MVA, 5 kV has a reactance of 0.02 pu. Find the reactance at a new base values of 50 MVA, 10 kV?

 0.02
 0.025
 0.05
 0.25

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