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Power Systems

Power Systems
Find the value of a729, where "a" is the operator

 1
 α
 0
 α²

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Power Systems
On what factors does the selection of a water turbine depend

 Speed.
  All of above.
 Nature of load.
 Working head.

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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?

 0.2 pu
 1.375 pu
 2.4 pu
 3.975 pu

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Power Systems
What will be the ratio of the C.T. on the H.V side of a 3 - φ star / delta 33 / 11 kV transformer if the protecting CT on the LV side has a ratio of 300 : 5 ?

  100 : 5 / √3.
 120 : 6 / √3.
  200 : 5 / √3.
 150 : 4 / √3.

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Power Systems
Percentage of carbon is highest in

  coal gas.
  bituminous coal.
  anthracite coal.
  lignite coal.

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Power Systems
One Kg of natural uranium gives energy equivalent to about

 1000 Kg of coal.
  10500 Kg of coal.
 5000 Kg of coal.
 100 Kg of coal.

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