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Power Systems

Power Systems
In nuclear power plants which material is/are used as coolant?

 graphite
 liquid sodium
All of these
 beryllium

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Power Systems
A thermal generating station has an installed capacity of 15 MW and supplies a daily load of 10 MW for 12 hours and 5 MW for remaining 12 hours. The plant capacity factor for the station is

 0.5
 0.75
 1
 0.6

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Power Systems
A generator has reactances of sub transient (X")= 0.5 pu, transient (X') = 0.8 pu and synchronous reactance (X) = 5 pu. The voltages at these reactances are 1.2 V, 1.1 V and 1 V respectively. Find the corresponding sub transient fault current in pu?

 1.375 pu
 2.4 pu
 0.2 pu
 3.975 pu

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Power Systems
The average thermal efficiency of a modern nuclear power plant is about

 60 %.
 80 %.
  30 %.
 40 %.

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Power Systems
For harnessing low variable water heads, the suitable hydraulic turbine with high percentage of reaction and runner adjust vanes is

  Francis.
  Kaplan.
  Pelton.
  Impeller.

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Power Systems
Units of incremental cost is

 RsMW/hr
 Rs/hr
 Rs/MWhr
 MWhr/Rs

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