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Power Systems

Power Systems
At slack bus, which one of the following combinations of variables is not specified?

 P and V
 V and δ
 P and Q
 Q and V

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Power Systems
Pump storage schemes are used to improve

 the power factor.
 the load factor.
  the plant capacity factor as well as the load factor of the power system.
 the diversity factor.

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Power Systems
Deflectors are provided in

 Francis turbine.
  Pelton wheel.
 propeller turbine.
 Kaplan turbine.

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Power Systems
A power station plant load factor is defined as the ratio of

 average load to the peak load
 the energy generated to that of maximum energy that could have been generated
 minimum load to peak load
 minimum load to average load

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Power Systems
The positive, negative and zero sequence per unit impedance of two generators connected in parallel are X1 = 0.12 pu, X2 = 0.096 pu and X0 = 0.036 pu. For LG fault at generator terminals (with 1 pu voltage) the positive sequence current will be

 10.936 pu
 7.936 pu
 9.936 pu
 8.936 pu

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Power Systems
Non-commercial sources of energy are

 solar, wind and biomass.
 fossil fuel, hydro power and nuclear power.
  wood, animal wastes and agricultural wastes.
None of these

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