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Power Systems

Power Systems
If the time of operation of a relay for unity TMS is 10 sec. the time of operation of 0.5 TMS will be _______________ secs.

 7.
 3.
 20.
  5.

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Power Systems
For 132 kV system, the reactance and capacitance up to the location of the CB is 3 Ω and 0.015 μF respectively. The maximum value of RRRV is

  9.01 kV / μs.
 10.01 kV / μs.
 2.0 kV / μs.
 12.2 kV / μs.

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Power Systems
The presence of earth in case of overhead lines

 decrease capacitance
 increase capacitance
 decrease inducatance
 increase inductance

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Power Systems
In which of the following transmission lines capacitance effect is negligible?

 medium transmission lines
 both 1 and 3
 shoart transmission lines
 long transmission lines

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

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

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Power Systems
In a thermal power plant, which of its following components needs maximum maintenance attention

 Condenser.
 Super heater.
 Boiler.
 Steam turbine.

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