Synchronous motors are generally not self-starting because:

Synchronous Motors 01/10/2021

A. the direction of rotation is not fixed
B. the direction of instantaneous torque reverses after half cycle
C. startes cannot be used on these machines
D. starting winding is not provided on the machines

Related Mcqs:

    For V-curves for a synchronous motor the graph is drawn between:_______________?
    A. armature current and power factor B. terminal voltage and load factor C. power factor and field current D. field current and armature current...
    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 running with normal excitation adjusts to load increases essentially by increase in______________?
    A. back e.m.f. B. armature current C. power factor D. torque angle...
    The percentage slip in case of a synchronous motor is____________?
    A. 1% B. 100% C. 0.5% D. zero...
    The back e.m.f. in the stator of a synchronous motor depends on____________?
    A. number of poles B. flux density C. rotor speed D. rotor excitation E. none of the above...

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