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Power Systems

Power Systems
Phase shift occurs due to which of the following components?

 capacitance
 inductance
 conductance
 both 1 and 2

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Power Systems
Advantages of per unit system is/are

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

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Power Systems
Which of the following decides the insulation level of 400 kV, EHV line?

 radio interference
 lighting voltage
 switching over voltage
 skin effect

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Power Systems
The ABCD constants of a 3-phase transmission line are A = D = 0.8∠1°, B = 170∠85° Ω , C = 0.002∠90.4° â„§. The sending end voltage is 400 kV. The receiving end voltage under no load condition is

 400 kV
 500 kV
 350 kV
 600 kV

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Power Systems
The insulator thickness on the conductor, in cables depends upon

 reactive power
 voltage
 power factor
 current

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Power Systems
Positive, negative and zero sequence impedances of line are 2,2 and 5 pu respectively. Find self and mutual impedances respectively?

 2 and 5 pu
 1 and 3 pu
 3 and 1 pu
 2 and 2 pu

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