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Power Systems

Power Systems
Which of following materials can be used as coolant

 CO2.
 Heavy water.
  Any of above.
 Helium.

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Power Systems
The rate of rise of restricting voltage depends upon the

  Inductance and capacitance of the system.
 Type of CB.
 Inductance of the system.
 Capacitance of the system.

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Power Systems
If the breakdown voltage of the insulator is high, the thickness of the insulator is

 it does not related to breakdown voltage
 less
None of these
 high

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Power Systems
Advantage/s of per unit system as compare to absolute system?

 calculation time is less
 only one equation is required
 memory required is less
All of these

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Power Systems
In a three-phase system, when the loads are perfectly balanced, the neutral current is

  one - third of maximum.
  zero.
  one - third of minimum.
  two - thirds of maximum.

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Power Systems
Which of the following matrix is used for load flow studies?

 null matrix
 Y bus matrix
 Z bus matrix
 Unit matrix

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