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Power Systems

Power Systems
A string type insulator has three units with self capacitance C and ground capacitance of 0.2 C having a string efficiency of

 78%
 82%
 80%
 76%

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Power Systems
The fact that current density is higher at the surface when compared to centre is known as

All of these
 carona
 skin effect
 proximity effect

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Power Systems
Taking the density of water to be 1000 kg/m³, how much power would be developed by a hydro electric generator unit, assume 100% efficiency, with 1 m head and 1 m³/s discharge?

 9.81 kW
 19.60 kW
 4.45 kW
 2.90 kW

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Power Systems
In which of the following configuration power transferability is higher?

 triangular configuration
 horizontal configuration
None of these
 same in both configuration

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Power Systems
In a nuclear reator thermal energy is obtained from

  fission of radioactive material.
 burning of fuel rods in oxygen.
 all of above.
 fusion of radioactive material.

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Power Systems
What is the preferred type of circuit breaker(CB) to be installed in extra high voltage AC system?

 Air blast CB
 Sulphur hexafluoride CB
 Bulk oil type CB
 Vacuum CB

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