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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.
 50.
 25.
 15.

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Power Systems
For transmission line which one of the following relation is true?

 AD - BC = 1
 AD - BC = -1
 AD + BC = 0
 AD - BC = 0

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Power Systems
For symmetrical network, the neutral current is

 any of the above
 maximum
 zero
 infinity

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Power Systems
A 3 core cable gives on test a capacitance of 3.7 µF between two cores. Find the line charging current of the cable when it is connected to 11 kV, 50 Hz system?

 14.7 mA.
 1.476 A.
 1 A.
  14.76 A.

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Power Systems
The main objectives of electrical power transmission is/are

 Transmission system must be more efficient with minimum line losses
 nether 1 nor 2
 Voltage regulation of the transmission line must be zero or minimum
 both 1 and 2

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Power Systems
The pu parameters for a 500 MVA machine on its own base are: Inertia, H = 20 pu; reactance X = 2 pu. The pu values of inertia and reactance on 100 MVA common base, respectively, are

 100, 10
 4, 10
 100, 0.4
 4, 0.4

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