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Power Systems

Power Systems
Condition for maximum voltage regulation

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

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Power Systems
Which of the following power plants can generate power at unpredictable or uncontrollable time

 Wind turbine.
 Condenser.
 Pulverising unit.
 Cooling tower.

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Power Systems
Maximum efficiency of modern coal fired steam raising thermal power plants is restricted to about 035 (a low value), mainly because of

  high energy loss from turbine exhaust to condenser.
 low alternative efficiency.
 low steam turbine mechanical efficiency.
 high energy loss in boiler.

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Power Systems
Out of the following plant categories which is not the base load power plant?

 Nuclear.
 Diesel.
  Pump storage.
 Run of river.

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Power Systems
A 3 core cable gives on test a capacitance of 3.7 µF between two cores. Find the line charging current of the cable when it is connected to 11 kV, 50 Hz system?

 14.7 mA.
 1.476 A.
 1 A.
  14.76 A.

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Power Systems
Under over excitation synchronous phase modifier works as

 series capacitor
 shunt reactor
 any of the above
 shunt capacitor

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