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Power Systems

Power Systems
For complete protection of 3-phase system from the short circuit faults minimum number of relays required are

 one
 two
 three
 six

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Power Systems
Uses of diesel power stations

All of these
  emergency plants.
  peak load plant.
 standby plants.

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Power Systems
A 3-phase breaker is rated at 2000 MVA, 33 kV, its making current will be

 70 kVA.
 49 kVA.
  35 kVA.
  89.22 kVA.

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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
Proximity effect is more in case of

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

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Power Systems
If we increase the spacing between the phase conductors, the line capacitance

None of these
 decreases
 increases
 remains unaffected

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