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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 transformer maximum flux density is not constant, the eddy current loss varies as

 f²
 V
 f
 V²

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Electrical Machines
Motors for fans and pumps are selected in the rpm range

  375 to 500.
  1440 to 2880.
  500 to 720.
  720 to 920.

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

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

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Electrical Machines
The speed of a motor falls from 1100 r.p.m at no-load to 1050 r.p.m at rated load. The speed regulation of motor is

 2.57 %.
 3.76%.
 2.56 %.
 4.76%.

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

 stationary
 rotates opposite direction
None of these
 rotates same direction

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