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Power Systems

Power Systems
Proximity effect is more in case of

 same in both cases
 over head lines
None of these
 power cables

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Power Systems
An unloaded generator with a pre-fault voltage 1 pu has the following sequence impedance: Z0 = j 0.15 pu, Z1 = Z2 = j 0.25 pu The neutral is grounded with a reactance of 0.05 pu. The fault current in pu for single line to ground fault is

 2.5 pu
 7.25 pu
 4.28 pu
 3.75 pu

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Power Systems
The ratio of reset to pick up current for an induction cup relay is approximately

  0.99.
 1.35.
 0.75.
 1.0.

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Power Systems
Critical disruptive voltage is a voltage at which

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

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Power Systems
Suspension type insulators are used for voltage beyond

 33 kV
 440 V
 11 kV
 230 V

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Power Systems
In a nuclear reactor, chain reactor is controlled by introducing

 iron rods.
 brass rods.
 graphite rods.
  cadmium rods.

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