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Power Systems

Power Systems
In nuclear power plants which material is/are used as coolant?

 graphite
All of these
 beryllium
 liquid sodium

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Power Systems
For n bus power system size of Y bus matrix is

 (n-2)×(n-2)
 n×n
 (n-1)×(n-1)
 (n-1)×(n-2)

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Power Systems
The only place where slip ring induction motors used in thermal power plants is

  coal handling plant.
  conveyors.
  lubrication oil pumps.
  none of above.

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Power Systems
A transmission line is compensated with shunt capacitance Csh. If the uncompensated transmission line surge impedance is Zs, then find the new surge impedance Zn after shunt compensation?

 Zs/√(1 + Kcsh)
 √(1 + Kcsh)/Zs
 Zs*√(1 + Kcsh)
All of these

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Power Systems
For complete protection of 3-phase system from the short circuit faults minimum number of relays required are

 one
 three
 six
 two

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Power Systems
What are the tests performed for oil-filled and gas-filled cables ?

 Load cycle tests.
 Thermal stability test.
  All of these.
 Impulse tests.

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