railway UPMRC SCTO 2024 Mock Test Electrical Machines Alternator and Synchronous Motors Alternator Voltage Regulation
A 500-kVA, 3.3-kV, 3-Phase star-connected alternator is found to give a short-circuit current of 110√3 A at normal field current. Estimate the magnitude of synchronous reactance if the effective winding resistance per phase is 1 ohm.
1
Xs = √102 Ω
2
Xs = √99 Ω
3
Xs = √101 Ω
4
Xs = 10 Ω