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Power Systems

Power Systems
If skin depth is more, then skin effect is

 more
None of these
 either 1 or 2
 less

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Power Systems
If a generator of 250 MVA rating has an inertia constant of 6 MJ/MVA, its inertia constant on 100 MVA base is

 15 MJ/MVA
 10.5 MJ/MVA
 6 MJ/MVA
 2.5 MJ/MVA

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Power Systems
Differential relays does not used for which of the following faults?

 both 1 and 2
 faults within a generator
 through faults
 faults within a transformer

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Power Systems
The per unit impedance of a circuit element is 0.30. If the base kV and base MVA are halved, then the new value of the per unit impedance of the circuit element will be

 0.0030
 0.30
 0.60
 0.0060

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Power Systems
A hydroelectric power station is commonly found in

  hilly areas.
 swamps.
 grasslands.
 desert areas.

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Power Systems
Critical disruptive voltage is a voltage at which

 nether 1 nor 2
 corona is just initiated
 corona is visible with blue or violet colour
 both 1 and 2

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