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Power Systems

Power Systems
Which of the following is used in thermal plants

 Otto cycle
 Joule cycle
All of these
 Rankine cycle

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Power Systems
The steam power plant efficiency can be improved by

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

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Power Systems
In a power system with negligible resistance, the fault current at a point is 8.00 pu. The series reactance is to be included at the fault point to limit the short circuit. current to 5.00 pu is

 0.075 pu.
  3.000 pu.
 0.125 pu.
 0.200 pu.

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Power Systems
Efficiency of thermal power plant can be taken as

  product of efficiencies of all stages.
  efficiency of thermal cycle.
  generator efficiency.
  turbine efficiency.

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Power Systems
The inductance of single phase two wire line is given by

 4×10-7× ln(r'/d) H/m
 0.4×10-7× ln(r'/d) H/m
 0.4×10-7× ln(d/r') H/m
 4×10-7× ln(d/r') H/m

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Power Systems
For a lossy transmission line, the characteristic impedance does not depend on

 The conductivity of conductors.
 The load terminating the line.
 The permittivity of the dielectric separating the conductor.
 The operating frequency of the line.

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