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

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Power Systems
Which of the following statement is/are true?Zn

 both 1 and 2
 The neutral grounding impedance Zn appears as Zn in zero sequence equivalent circuit
 nether 1 nor 2
 The neutral grounding impedance Zn appears as 3Zn in zero sequence equivalent circuit

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