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Power Systems

Power Systems
Uses of diesel power stations

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

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

None of these
 increases
 remains unaffected
 decreases

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Power Systems
Rankine cycle efficiency of a steam power plant is of

  60 - 80 %.
  30 - 45 %.
  45 - 80 %.
  20 - 30 %.

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Power Systems
A 1-phase transmission line has an impedance (3+4j) Ω . Find the power factor of the load for achieving maximum and zero voltage regulation?

 0.6 lag and 0.6 lead
 0.8 lag and 0.8 lead
 0.6 lag and 0.8 lead
 0.8 lag and 0.6 lead

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Power Systems
Mho relays are used for the protection of which of the following lines?

None of these
 medium transmission lines only
 long transmission lines only
 short transmission lines only

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Power Systems
The characteristic impedance of a transmission on line is

  Independent of its length.
 Inversely proportional to its length.
 Directly proportional to its length.
 Directly proportional to square root of its length.

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