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Power Systems

Power Systems
If the fault is very nearer to the generator, the fault current is

 larger
 zero
 less
 any of the above

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Power Systems
Consider a long, two wire line composed of solid round conductors. The radius of both conductors is 0.25 cm and distance between their centers is 100 cm. If this distance is doubled, then the inductance per unit length.

 Halves.
 Decrease but does not halves.
 Doubled.
  Increase but does not doubled.

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

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Power Systems
A hydraulic turbine having rated speed of 250 rpm is connected to a synchronous generator. In order to produce power at 50 Hz, the numbers of pole are required in the generator

 12.
  24.
 6.
 16.

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Power Systems
Which of the following relays is/are unit protection relays?

 both 1 and 2
 Differential relays
 Buccholz relays
 over current relays

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Power Systems
The insulation resistance of the 20 km long underground cable is 8 MΩ. Other things being same, the insulation resistance of 10 km long cable will be

 4 MΩ
 16 MΩ
 32 MΩ
 8 MΩ

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