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Electrical Machines

Electrical Machines
Transformer core is laminated to reduce

 copper loss.
 hysteresis loss.
 eddy current loss.
 both 1 and 2.

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Electrical Machines
which of the following type of brush and their application is/are correct

All of these
 electro graphite → large ratings
 copper graphite → low voltage high current density
 carbon brush → normal ratings

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Electrical Machines
Width of a carbon brush should be equal to

 the width of the 1 to 2 commutator segment.
 the width of the 2 to 3 commutator segment.
 less than the width of commutator segment.
 the width more than 3 commutator segment.

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Electrical Machines
A 3 - Φ, 6 pole, 50 Hz IM is running at a full load speed of 980 rpm. If it delivers an air gap power of 98000 Watt, calculate the rotor ohmic loss?

  980 Watt.
  1960 Watt.
 1920 Watt.
 1800 Watt.

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Electrical Machines
Find the developed torque DC Series Motor having armature resistance of 0.2 Ω and taking armature current of 60 A is connected to 250 V supply. Considered brush drop of 1 V each.

 133.22 N-m
 234.76 N-m.
 266.20 N-m.
 cant be determined.

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Electrical Machines
Which of the following motors is/are widely used?

 slip ring induction motor
 squirrel cage induction motor
None of these
 either of these

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