Electrical Machines
An induction motor having 8 poles runs at 727.5 rpm. If the supply frequency is 50Hz, the emf in the rotor will have a frequency of

 51.5Hz
 2.5Hz
 48.5Hz
 1.5Hz

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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,

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

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