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Power Systems

Power Systems
Attenuation occurs due to

 conductance
 inductance
 both 1 and 3
 resistance

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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?

 250 A
 200 A
 100 A
 2500 A

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Power Systems
Skin effective is more in case of

 power lines
 same in both cases
 communication lines
None of these

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Power Systems
A coal fired steam power station working at a plant factor of 80% has one 500 MW generating unit. If the heat content of coal is 2 kWh/kg, the overall plant efficiency is 40% and a train load of coal is 2000 metric tons, then the number of trains required daily for the plant is

 2
 10
 6
 16

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Power Systems
A 100 Km long transmission line is loaded at 110 kV. If the loss of line is 5 MW and the load is 150 VA the resistance of the line is

 2.26 Ω / phase.
 6.06 Ω / phase.
  8.06 Ω / phase.
 4.65 Ω / phase.

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Power Systems
Under over excitation synchronous phase modifier works as

 shunt reactor
 shunt capacitor
 series capacitor
 any of the above

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