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Power Systems

Power Systems
A 10 MVA generator has reactance of 0.2 pu. Find the new reactance value for 50 MVA base?

 0.25 pu
 1 pu
 5 pu
 0.2 pu

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Power Systems
Which of following generating plants has the minimum operating cost

 Steam plant.
 Nuclear plant.
 Hydroelectric plant.
 Diesel plant.

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Power Systems
If we increase the length of the transmission line, the charging current

 remains unaffected
None of these
 decreases
 increases

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Power Systems
Earthing switch is used for

All of these
 discharging residual energies
 measuring of safety voltage
 protection of equipment from ground faults

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Power Systems
Positive, negative and zero sequence impedances of line are 2,2 and 5 pu respectively. Find self and mutual impedances respectively?

 1 and 3 pu
 2 and 5 pu
 3 and 1 pu
 2 and 2 pu

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Power Systems
The SWR on a lossless transmission line of the characteristic impedance 100 ohm is 3. The line is the terminated by

 A resistance of 100/3 ohm.
 A resistance of j100/3 ohm.
 A resistance of 100 ohm.
 A resistance of j300 ohm.

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