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Power Systems

Power Systems
In thermal plant most of the energy is wasted in

 turbines
 boiler
 condenser
 ESP

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Power Systems
A transmission line has a surge impedance of 400 Ω is connected with the cable having surge impedance of 40 Ω, a surge magnitude of 100 kV is travelling from the transmission line towards the cable. Find the incident current?

 200 A
 250 A
 2500 A
 100 A

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Power Systems
Maximum power capacity of a transmission line can be increased by

 nether 1 nor 2
 either 1 or 2
 decreasing reactance value
 increasing voltage level

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Power Systems
The per unit impedance of a circuit element is 0.30. If the base kV and base MVA are halved, then the new value of the per unit impedance of the circuit element will be

 0.60
 0.0060
 0.0030
 0.30

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Power Systems
The presence of earth in case of overhead lines

 decrease capacitance
 increase inductance
 decrease inducatance
 increase capacitance

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Power Systems
The area under a flow duration curve represents

 total power available.
 maximum rate of run-off during the period.
  total quantity of run-off during that period.
 total of units of energy available.

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