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Power Systems

Power Systems
Galvanised steel is generally used as

 structural components.
 stray wire.
 earth wire.
All of these

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Power Systems
Demand factor of a plant is

 1
 0
 less than 1
 greater than 1

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Power Systems
The water from a catchment is 60*106 cu m annually and hydro station has head of 40 m. Assuming ideal generator and turbine, the power that can be theoretically generated is

 750 kW
 250 kW
 300 kW
 500 kW

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Power Systems
A 3 - Φ, 33 kV oil circuit breaker is rated 1200 A, 2000 MVA, 3 s. The symmetrical breaking current is

  35 kA.
 104.8 kA.
 1200 A.
 3600 A.

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Power Systems
The insulation resistance of the 20 km long underground cable is 8 MΩ. Other things being same, the insulation resistance of 10 km long cable will be

 8 MΩ
 4 MΩ
 16 MΩ
 32 MΩ

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Power Systems
The line currents of 3-phase supply are: IR = 3 + j 5 A IY =2 + j 2 A IB = -2 - j 1 A The zero sequence current will be

 5 + j 7 A
 -2 - j 1 A
 1 + j 2 A
 1 + j 4 A

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