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Power Systems

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

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

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Power Systems
The load duration curve for a system is 8 hours 30 MW, 16 hours 25 MW and 24 hours 20 MW. The load factor will be

 0.25.
  0.83.
 1.3.
 0.44.

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Power Systems
Earthing switch is used for

 discharging residual energies
 protection of equipment from ground faults
 measuring of safety voltage
All of these

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Power Systems
The conductor of a 10 Km long single phase, two wire line are separated by a distance of 1.5 m the diameter of each conductor the inductance of the circuit is

 23.33 mH.
 21.2 mH.
  23.8 mH.
 25.8 mH.

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Power Systems
If the load is short circuited, then reflection coefficient of voltage is

 -1
 0
 1
 -2

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Power Systems
The neutral of 10 MVA, 11 kV alternator is earthed through a resistance of 5 ohms. The fault ready is set to operate at 0.75 A. The current transformers have a ratio of 1000/5. What is the percentage of the alternator winding is protected?

 15%
 88.2%
 85%
 11.8%

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