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Power Systems

Power Systems
Condition for maximum voltage regulation

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

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Power Systems
Efficiency of thermal power plant can be taken as

  turbine efficiency.
  product of efficiencies of all stages.
  efficiency of thermal cycle.
  generator efficiency.

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Power Systems
A hydro power plant of run off river type should be provided with pondage so that the

 kinetic energy of the running water is fully utilized.
 operating head is controlled.
 pressure inside the turbine casing remains.
  firm capacity of plant is increased.

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Power Systems
Taking the density of water to be 1000 kg/m³, how much power would be developed by a hydro electric generator unit, assume 100% efficiency, with 1 m head and 1 m³/s discharge?

 2.90 kW
 4.45 kW
 9.81 kW
 19.60 kW

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Power Systems
What is the approximate efficiency of a normal thermal power station?

 60-70%
 20-25%
 45-55%
 30-40%

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Power Systems
Maximum power transfer capability of transmission line can be increased by

All of these
 Parallel transmission lines
 Using series capacitance
 Using bundled conductors

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