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Electrical Machines

Electrical Machines
A 4 pole 50 Hz induction motor is running at 1470 rpm. Find the speed of stator magnetic field with respect to rotor?

 zero
 1500 rpm
 1470 rpm
 30 rpm

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Electrical Machines
In a 3 - Φ IM in order to eliminate cogging the number of stator slots must be

  either (B) or (C).
  unequal to number of rotor slots and skewed in shape.
  an integral multiple of number of rotor slots.
  equal to number of rotor slots.

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Electrical Machines
Consider a separately excited DC motor. If the field current is increased while the armature terminal voltage is held constant, then speed of the motor will

 none of these.
 increase.
 Decrease.d
 remains same.

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Electrical Machines
Unbalance 3 - Φ stator currents cause

All of these
  vibrations.
  double frequency currents in the rotor.
  heating of rotor.

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Electrical Machines
Field divertor method of speed control of a DC series motor gives speed above rated one due to reduction of

 Armature current.
 Field current.
 None of above.
 Line current.

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Electrical Machines
In IM the rotor lamination can be ________________ than stator laminations.

  rotor can not have any laminations.
  sipper.
  thicker.
  thinner.

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