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Power Systems

Power Systems
If the fault current is 2000 A, the relay setting is 50% and CT ratio is 400 : 5, then plug setting multiplier will be

 10.
 25.
 15.
 50.

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Power Systems
The radiation shield for a nuclear power reactor for biological safety is provided by having the reactor

  encased by thick concrete wall.
 encased thick metal wall.
 immersed in water pool.
 isolated from outside word with strong magnetic field.

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Power Systems
Oxide film arrestor has which of the following properties?

 It is expensive.
 Does not require daily charging.
 Installed at points of transmission line where daily visit is difficult.
 Both A and B.

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Power Systems
In thermal plant most of the energy is wasted in

 condenser
 boiler
 turbines
 ESP

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Power Systems
The line currents of 3-phase supply are: IR = 3 + j 5 A IY =2 + j 2 A IB = -2 - j 1 A The zero sequence current will be

 1 + j 4 A
 5 + j 7 A
 1 + j 2 A
 -2 - j 1 A

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Power Systems
Surge tank is kept very close to the

 pen stock
 spill way
 turbine
 generator

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