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Power Systems

Power Systems
If the inertia constant H = 10 MJ/MVA for a 50 MVA generator, the stored energy is

 500 MJ
 5 MJ
 50 MJ
 10 MJ

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Power Systems
The line currents of 3-phase supply are: IR = 3 + j 5 A IY =2 + j 2 A IB = -2 - j 1 A The zero sequence current will be

 1 + j 4 A
 -2 - j 1 A
 1 + j 2 A
 5 + j 7 A

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Power Systems
Which following statement are not true for line parameters R, L, G and C of transmission line

 All of above.
 G = 1/R where G is conductance of line.
 LC = μ ε and RG = σ ε.
 Both R and G depend on the conductivity of conductor forming the line.

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Power Systems
More efficient plants are used as

None of these
 both 1 and 2
 peak load plant
 base load plant

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Power Systems
The conductor carries more current on surface as compared to core. This is called as

 skin effect
All of these
 corona effect
 unsymmetrical fault

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Power Systems
If sag in an overhead line increase, tension in the line

 decrease
None of these
 remains same
 increase

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