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Power Systems

Power Systems
Which of the following plants is/are base load plants

 nuclear
 pump storage
 both 1 and 2
 run off river

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Power Systems
Mercury is choice with steam in binary vapor cycle because

  all of above.
 relative low vaporization pressure.
 higher critical temperature and pressure.
 higher saturation temperature than other fluids.

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Power Systems
A 3-phase, 110 kV coaxial XLPE insulated power cable delivering power at 50 Hz, has a capacitance of 125 nF/km. If the dielectric loss tangent of XLPE is 2*10^-4, then dielcetric power loss in this cable in W/km/phase is

 31.7
 23.9
 35.45
 38.6

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Power Systems
Aluminium is now most commonly employed conductor material in transmission lines than copper because

 costlier
 it is cheaper and lighter
 it is more conductive
 its tensile strength is more

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Power Systems
The essential requirement(s) for power plants to be operated as peak load plants are

 Quick response to load variation.
 Capability of quick starts.
All of these
 Low capital cost.

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Power Systems
Which of following power plants is free from environmental problem

 Nuclear.
  Hydroelectric.
 Steam.
 Diesel engine.

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