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Synchronous Motors

A synchronous motor connected to infinite bus-bars has at constant full load, 100% excitation and unity power factor. On changing the excitation only, the armature current will have_____________?

Synchronous Motors /
A synchronous motor connected to infinite bus-bars has at constant full load, 100% excitation and unity power factor. On changing the excitation only, the armature current will have_____________?

A. no change of power factor
B. lagging power factor with over-excitation
C. leading power factor with under-excitation
D. leading power factor with over-excitation

A synchronous motor connected to infinite bus-bars has at constant full load, 100% excitation and unity power factor. On changing the excitation only, the armature current will have_____________? Read More »

Synchronous Motors

The maximum value of torque that a synchronous motor can develop without losing its synchronism, is known as_____________?

Synchronous Motors /
The maximum value of torque that a synchronous motor can develop without losing its synchronism, is known as_____________?

A. slip torque
B. pull-out torque
C. breaking torque
D. synchronising torque

The maximum value of torque that a synchronous motor can develop without losing its synchronism, is known as_____________? Read More »

Synchronous Motors