Electrical Machines
For a DC Motor for constant load torque, what will happen to the armature current if armature resistance increases?

 Decreases.
 None of above.
 Remain unchanged
 Increases.

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Electrical Machines
Two of supply terminals to a 3 - Φ induction motor get interchanged during re-connection after normal maintenance. When switched on the supply, the motor will

  not start at all.
  rotate in the same direction as before maintenance.
  get heated and damaged.
  rotate in direction opposite to that before maintenance.

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Electrical Machines
Torque angle of a synchorous machine operating from a constant voltage bus is usually defined as the space angle between

 Rotor mmf wave and resultant flux density wave.
 Stator mmf wave and resultant flux density.
  Rotor mmf wave and stator mmf wave.
 Stator mmf wave and resultant mmf wave.

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