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Electrical Machines

Electrical Machines
The output power of a dc motor is given by

  EbIa.
  EIa.
  none of these.
  EbIa2.

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Electrical Machines
In a dc machine, the demagnetizing effect of armature reaction is due to

 magnetic saturation in half of the field pole
 component of armature mmf along field axis
 uneven air-gap length
 non-sinusoidal nature of armature mmf

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Electrical Machines
A 240 V, dc shunt motor draws 15 A while supplying the rated load at a speed of 80 rad/s. The armature resistance is 0.5 W and the field winding resistance is 80 W. The net voltage across the armature resistance at the time of plugging will be

 474 V
 234 V
 240 V
 6 V

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Electrical Machines
In a 3 - φ induction motor running at full load which of these parameters is stationary with respect to the stator mmf wave?

  Rotor mmf wave.
  Stator winding.
  Rotor winding.
  Both rotor and stator winding.

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Electrical Machines
Capacitor fitted with ceiling / table fans is of the value of

 0.1 µF.
  1 - 2 µF.
  2 - 3 µF.
 5 - 10 F.

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Electrical Machines
In case of DC shunt motor if load is reduced

  The speed will remains almost constant.
 DC Shunt Motor
 The speed will increase in proportion to reduction in load.
 The speed will increase abruptly.

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