When the rotor speed, in a synchronous machine, becomes more than the synchronous speed during hunting, the damper bars develop

Related MCQs

• In a synchronous motor, damper windings are provided on
• The maximum torque which a synchronous motor will develop at rest for any angular position of the rotor, at rated stator supply voltage and frequency, is known as
• A synchronous motor can develop synchronous torque
• Under which of the following conditions hunting of synchronous motor is likely to occur ?
• Hunting in a synchronous motor cannot be due to
• 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
• When the stator windings are connected in such a fashion that the number of poles are made half, the speed of the rotor of a synchronous motor
• 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
• The rotor copper losses, in a synchronous motor, are met by
• The mechanical displacement of the rotor with respect to the stator, in polyphase multipolar synchronous motors running at full load, is of the order of