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Power Systems

Power Systems
If the time of operation of a relay for unity TMS is 10 sec. the time of operation of 0.5 TMS will be _______________ secs.

 20.
  5.
 7.
 3.

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Power Systems
Which of the following contributes to the Rankine cycle efficiency improvement in a thermal power plant

 Use of steam for heating of boiler feed water.
All of these
 Use of high pressure.
 Reheat of steam an intermediate stages.

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Power Systems
What type of back up protection is used for alternators?

  Impedance relay.
  IDMT relay.
  Mho relay.
  Buchholz relay.

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Power Systems
The insulation of the modern EHV lines is designed based on

 R × I.
  the switch voltage.
 the lighting voltage.
 corona.

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Power Systems
Condition for maximum voltage regulation

 cosφ = X/R
 tanφ = X/R
 cosφ = R/X
 tanφ = R/X

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Power Systems
The conversion ratio of a breeder reactor is

 less than unity.
  equal to unity.
 none of above.
  more than unity.

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