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Power Systems

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

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

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Power Systems
Earth fault relay uses the which of the following sequence currents?

 zero sequence
 negative sequence
 any of the above
 positive sequence

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Power Systems
A string insulator has 4 units. The voltage across bottom most unit is 10 kV and its efficiency is 90%. Find the total operating phase voltage?

 32 kV
 40 kV
 36 kV
 45 kV

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Power Systems
When a pumped storage power plant is operated in conjunction with a steam power plant

 the operating cost of the steam plant become optimum
 chances of the tripping of the system decrease
All of these
 load factor of the steam plant is increased

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Power Systems
Which of the following insulator is practically used for railway crossings?

 pin insulator
All of these
 strain insulator
 string insulator

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Power Systems
IF the time of operation of a relay for unity TMS is 10 sec then the time of operation for 0.5 TMS is

 none of these.
 20 sec.
  5 sec.
 10 sec.

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