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Power Systems

Power Systems
Which of the following is/are base load plants?

 thermal plants
 nuclear plants
 hydro plants
All of these

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Power Systems
Two insulator discs of identical capacitance value C make up a string for a 22 kV, 50 Hz, single phase overhead line insulation system. If pin to earth capacitance is also C, then find the string efficiency?

 90%
 75%
 86%%
 50%

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Power Systems
An unloaded generator with a pre-fault voltage 1 pu has the following sequence impedance: Z0 = j 0.15 pu, Z1 = Z2 = j 0.25 pu The neutral is grounded with a reactance of 0.05 pu. The fault current in pu for single line to ground fault is

 7.25 pu
 3.75 pu
 4.28 pu
 2.5 pu

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Power Systems
Which of the following rotor is used in thermal power plants?

 squirrel cage rotor
 cylindrical rotor
 salient pole rotor
 either of these

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Power Systems
Surge impedance loading of a line is increased by which of the following compensation methods?

 shunt reactor
 both 1 and 2
 shunt capacitor
 series capacitor

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Power Systems
The function of moderator in a nuclear reactor is

  to slow down the neutrons.
 to absorb the excess.
 to increase the energy of the neutrons.
All of these

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