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Power Systems

Power Systems
The sequence components of the fault current are as follows: IR1 = j1.5 pu, IR2 = -j0.5 pu, IR0 = -j1. The type of fault is

 LL
 LG
 LLL
 LLG

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Power Systems
A loss less transmission line has a length of 600 km, find the phase shift of voltage signal?

 45°
 36°
 42°
 90°

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Power Systems
Advantages of per unit system is/are

 It has units for all quantities
All of these
 No units for any quantity
 Need of transformation ratio

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Power Systems
For loss less line, find the ratio of length to the wave length of a signal for a phase shift of 0.05 radians?

 8 × 10³
 2 × 10-3
 7.95 × 10-3
 7.95 × 10³

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Power Systems
The daily energy produced in thermal power station is 720 MWh at a load factor of 0.6. What is the maximum demand of the station?

 720 MW
 50 MW
 72 MW
 30 MW

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Power Systems
The load current in short circuit calculations are neglected because

 nether 1 nor 2
 short circuit currents are greatly out of phase with load currents
 short circuit currents are much larger than load currents
 both 1 and 2

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