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Power Systems

Power Systems
For load flow studies, What are the quantities specified at load bus are

 P and Q
 V and δ
 P and V
 δ and Q

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Power Systems
Advantages of per unit system is/are

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

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Power Systems
For accurate load flow calculations on large power systems, the best method is

 Decoupled method
 G-S method
All of these
 N-R method

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Power Systems
Corona is accompanied by

All of these
 power loss and interference
 hissing sound
 violet visible light

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Power Systems
A 1-phase transmission line has an impedance (3+4j) Ω . Find the power factor of the load for achieving maximum and zero voltage regulation?

 0.8 lag and 0.8 lead
 0.6 lag and 0.8 lead
 0.8 lag and 0.6 lead
 0.6 lag and 0.6 lead

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Power Systems
Incremental cost of two generators Ic1 = 0.2 P1+60, Ic2 = 0.3 P2+40 and the ratings of the generator are 150 and 250 MW. Find the load sharing of each generator for a load of 200 MW?

 P1 = 120 MW, P2 = 80 MW
 P1 = 100 MW, P2 = 100 MW
 P1 = 80 MW, P2 = 120 MW
 P1 = 60 MW, P2 = 140 MW

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