Electrical Machines
For a 3 - Φ, 4 pole, 50 Hz IM rotating at full load speed of 1440 rpm, calculate speed of rotor field with respect to rotor structure and stator structure respectively?

 1440, 1500.
 60, 1440.
 50, 1500.
  60, 1500.

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Electrical Machines
If two 8-pole dc machines of identical armature sare wound, one with lap winding and the other with wave winding, then

 wave-wound machine will have more rated current and more voltage
 lap-wound machine will have more rated voltage and more current
 wave-wound machine will have more rated voltage and less current
 lap-wound machine will have more rated voltage and less current

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