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Power Systems

Power Systems
Location of a surge tank, in an hydro electric power station is near

 reservoir.
  turbine.
 tail race.
 dam.

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Power Systems
The commercial sources of energy are

  fossile fuels and radioactive substances.
 none of above.
 wood, animal wastes and agricultural wastes.
 solar, wind, biomass.

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Power Systems
The inductance of single phase two wire line is given by

 4×10-7× ln(r'/d) H/m
 4×10-7× ln(d/r') H/m
 0.4×10-7× ln(d/r') H/m
 0.4×10-7× ln(r'/d) H/m

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Power Systems
Which of the following faults is/are treated as external faults?

 Failure of prime mover of the generator
 Over voltage
 Failure of excitation
All of these

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Power Systems
The specific speed ( NS ) of turbine is given by

 P√( N ) / H3/2.
 N√( P ) / H2/3.
 none of these.
  N√( P ) / H1.25.

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Power Systems
An alternator having an induced emf of 1.6 pu is connected to an infinite bus of 1 pu. If the bus bar has reactance of 0.6 pu and alternator has reactance of 0.2 pu, what is the maximum power that can be transferred?

 6 pu
 5 pu
 2.67 pu
 2 pu

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