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POWER SYSTEMS

Power Systems
The positive (Z1), negative (Z2) and zero sequence (Z0) impedances of a transmission line follows the relation

 (Z1 = Z2) < Z0
 Z1 = Z2 = Z0
 (Z1 = Z2) > Z0
 any of the above

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Power Systems
Peterson coil is used in case of transmission line for

 improve power factor
 compensation of arcing grounds
 reduce ferranti effect
 increase the voltage level

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Power Systems
Which of the following represents the transmission line positive sequence reactance

 Xs +2 Xm
 2Xs + Xm
 Xm - Xs
 Xs - Xm

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Power Systems
High capacity generators and motors are of

 star connected with grounding network
 any of the above
 star connected network
 delta connected network

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Power Systems
Which of the following statements is/are true? In case of parallel transmission lines

 fault current increases
 both 1 and 3
 fault current reduces
 stability increases

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