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Power Systems

Power Systems
Find the propagation constant, if impedance is 10Ω and admittance is 10 â„§?

 1
 100
 10
 5

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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?

 100 A
 250 A
 200 A
 2500 A

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Power Systems
Pumped storage plant is a

 peak load plant
 base load plant
 both 1 and 2
None of these

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Power Systems
Peterson coil is used in case of transmission line for

 compensation of arcing grounds
 increase the voltage level
 improve power factor
 reduce ferranti effect

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Power Systems
The inertia constant of 100 MVA, 50 Hz, 4 pole generator is 10 MJ/MVA. If the mechanical input to the machine is suddenly raised from 50 MW to 75 MW, the rotor acceleration will be equal to

 225 electrical degrees/s²
 12.5 electrical degrees/s²
 125 electrical degrees/s²
 22.5 electrical degrees/s²

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Power Systems
The steam power plant efficiency can be improved by

 decreasing the load on the plant.
 using large quantity of water.
 burning large amount of coal.
  using high temperature and high pressure steam.

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