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Power Systems

Power Systems
Mho relay is used for protection of

  none of these.
  medium lines.
  long lines.
  short lines.

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Power Systems
Lightning arresters are made up of which material?

 copper
 silver
 silicon oxide
 any of the above

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Power Systems
The maximum efficiency of modern coal fired steam steam raising thermal power plants is restricted to about 0.35( a low value), mainly because of

 low steam turbine mechanical efficiency
 low alternator efficiency
 high energy loss in boilers
 high energy loss in condenser

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Power Systems
The area under a flow duration curve represents

 total of units of energy available.
 total power available.
  total quantity of run-off during that period.
 maximum rate of run-off during the period.

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Power Systems
Ferranti effect can be compensated by which of the following

 both 1 and 2
 shunt capacitor
 shunt reactor
 series capacitor

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Power Systems
The Y bus matrix of 100 bus interconnected system is 90% sparse. Hence the number of transmission lines in the system must be

 500
 250
 900
 450

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