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Power Systems

Power Systems
Proximity effect is more in case of

 power cables
None of these
 same in both cases
 over head lines

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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 transmitted voltage?

 30.6 Kv
 100 kV
 18.18 kV
 36. 36 kV

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Power Systems
When a transformer is loaded, the secondary terminal voltage gains. That means power factor is

 zero.
  leading.
 lagging.
 unity.

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Power Systems
The flow duration curve at a given head of a hydroelectric plant is used to determine

 load factory at the plant.
 diversity factor for the plant.
  total power available at the site.
 total units of energy available.

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Power Systems
Pelton turbine is a ----------- turbine

 axial flow
 any of the above
 inward radial flow
 impulsive

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Power Systems
The neutral of 10 MVA, 11 kV alternator is earthed through a resistance of 5 ohms. The fault ready is set to operate at 0.75 A. The current transformers have a ratio of 1000/5. What is the percentage of the alternator winding is protected?

 11.8%
 15%
 88.2%
 85%

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