Electrical Machines
Armature flux is.............with respect to main field flux or main field poles?

None of these
 stationary
 rotates same direction
 rotates opposite direction

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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

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

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Electrical Machines
Two dc machines A and B, using the same conductor material, have armature circuit resistances of 0.4 Ω and 1.2 Ω respectively. Of the two machines,

 B is bigger than A for the same current rating
 A is bigger than B for the same voltage rating
 A is bigger than B for the same current rating
 both are of the same size for the same current rating

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