A synchronous motor, connected to an infinite bus, is working at a leading power factor. Its excitation emf Ef and terminal voltage Vt are related as under
A. Ef > Vt and Ef lags Vt
B. Ef < Vt and Ef lags Vt
C. Ef > Vt and Ef leads Vt
D. Ef< Vt, and Ef leads Vt [A.M.I.E. Sec B. Elec. Machines Summer 2002]
Answer:C
A synchronous motor, connected to an infinite bus, is working at a leading power factor. Its excitation emf Ef and terminal voltage Vt are related as under
A. Ef > Vt and Ef lags Vt B. Ef < Vt and Ef lags Vt C. Ef > Vt and Ef leads Vt D. Ef< Vt, and Ef leads Vt [A.M.I.E. Sec B. Elec. Machines Summer 2002]