Power factor of a synchronous motor is unity when

Related MCQs

• A synchronous motor installed at the receiving end substation operates with such an excitation that it takes power at lagging power factor. Now if the applied voltage of the synchronous motor goes down, the power factor of the synchronous motor will
• 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
• If in a synchronous motor, driving mechanical load and drawing current at lagging power factor from constant voltage supply, its field excitation is increased, then its power factor
• If in a synchronous motor, driving a given mechanical load and drawing current at a leading power factor from constant voltage supply its field excitation is increased, its power factor
• A synchronous motor has better power factor as compared to that of an equivalent induction motor. This is mainly because
• The power factor of a synchronous motor is better than that of induction motor because
• A synchronous motor can develop synchronous torque
• A synchronous motor can be used as a synchronous capacitor when it is
• When the field of a synchronous motor is under-excited, the power factor will be
• When load on an over-excited or under excited synchronous*motor is increased, rate of change of its armature current as compared with that of power factor is