Power Systems
The pu parameters for a 500 MVA machine on its own base are: Inertia, H = 20 pu; reactance X = 2 pu. The pu values of inertia and reactance on 100 MVA common base, respectively, are

 100, 10
 4, 10
 4, 0.4
 100, 0.4

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Power Systems
Advantages of shunt compensation is/are

 smooth voltage regulation is possible by controlling excitation
 single unit can be used as both capacitance and inductor by adjusting the excitation
 It requires less maintanance
All of these

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