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Power Systems

Power Systems
Lightning arresters are made up of which material?

 silicon oxide
 any of the above
 copper
 silver

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Power Systems
The sequence components of the fault current are as follows: IR1 = j1.5 pu, IR2 = -j0.5 pu, IR0 = -j1. The type of fault is

 LL
 LLG
 LLL
 LG

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Power Systems
For loss less line, find the ratio of length to the wave length of a signal for a phase shift of 0.05 radians?

 2 × 10-3
 8 × 10³
 7.95 × 10-3
 7.95 × 10³

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Power Systems
Objectives of power system is/are

 Cost of electrical energy per KWh is to be minimum
 Rated voltage and frequency has to be supplied to the consumers
 nether 1 nor 2
 both 1 and 2

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Power Systems
The steam power plant efficiency can be improved by

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

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Power Systems
Stock bridge dampers are used to

 reduce the tension
All of these
 increase the sag
 reduce the vibrations at the point of support

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