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Power Systems

Power Systems
Cheapest plant in operation and maintenance is

  nuclear.
  steam power.
  diesel power.
  hydroelectric.

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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.
 Use of high pressure.
All of these
 Reheat of steam an intermediate stages.

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Power Systems
Stock bridge dampers are used in case hill areas to over come the which problem?

 increase power factor
 increase string efficiency
All of these
 unequal ice loading

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Power Systems
A generating station which has a high investment cost and low operating cost is usually operated as a

 None of above.
 Minimum load station.
 Peak load station.
 Base load station.

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Power Systems
A diesel power plant is generally used as a/an

 Base load.
 Peak loads.
 Any of above.
 Standby/emergency plant.

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Power Systems
The neutral of 10 MVA, 11 kV alternator is earthed through a resistance of 5 ohms. The fault ready is set to operate at 0.75 A. The current transformers have a ratio of 1000/5. What is the percentage of the alternator winding is protected?

 11.8%
 15%
 85%
 88.2%

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