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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.

 20.
  5.
 3.
 7.

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Power Systems
Water hamming process in pen-stocks results in

None of these
  noise increases.
  pressure increases.
  noise increases, pressure increases, velocity decreases.

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Power Systems
The presence of earth in case of overhead lines

 increase capacitance
 decrease inducatance
 increase inductance
 decrease capacitance

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Power Systems
What will be the thermal efficiency of a 240 V, 1000 W electric kettle if it brings 2 liters of water at 15° C to boiling point 15 Minutes

 78.96 %.
 80.25 %.
  79.33 %.
  74.56 %.

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Power Systems
Which of the following decides the insulation level of 400 kV, EHV line?

 skin effect
 radio interference
 switching over voltage
 lighting voltage

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Power Systems
Skin effect depends on

All of these
 frequency
 conductivity
 relative permeability

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