ELECTRICAL MACHINES QUIZ

  maximum of the static torque with the phase winding excited.

  minimum of the static torque with the phase winding unexcited.

  maximum of the static torque with the phase winding unexcited.

  minimum of the static torque with the phase winding excited.

 reactance voltage produced due to communication.

 the use drum winding.

  the use equalizer in lap winding.

 the use of compensating winding.

  Over-excitation.

  Periodic variation of load.

  Over-loading for long period.

  Small and constant load.

 windage and friction loss

 Copper loss

 core loss only

 both 1 and 2

 efficiency

 leakage reactance

 ratings

 per unit impedance

  cheaper in cost.

  of low resistivity.

  lighter in weight.

  easy to cast owing to its low melting point and is easily available.

 rotor of an synchronous machine.

 rotor of a dc machine.

 stator of a induction machine.

 stator of a dc machine.

  negative sequence currents are generated.

  the damper bars develop induction generator torque.

  the damper bars develop induction motor torque.

  the damper bars develop synchronous motor torque.

 140 V

 240 V

 175 V

 120 V

 increases

 remains unaffected

 decreases

 any of the above