Power Systems
The inertia constant of 100 MVA, 50 Hz, 4 pole generator is 10 MJ/MVA. If the mechanical input to the machine is suddenly raised from 50 MW to 75 MW, the rotor acceleration will be equal to

 12.5 electrical degrees/s²
 125 electrical degrees/s²
 225 electrical degrees/s²
 22.5 electrical degrees/s²

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Power Systems
ACSR means

 all conductor steel reinforced
 Aluminium core steel reinforced
 Aluminium copper steel reinforced
 Aluminium conductor steel reinforced

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