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Electrical Machines

Electrical Machines
The commutator segments of DC machines are made up of

 copper alloy
 brass
 copper
 hard-drawn copper

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Electrical Machines
Which of the following statement is true for an AC synchronous motor?

 It is a step angled motor.
  It is a constant speed motor.
 It is a high reluctance motor.
 It is a variable speed motor.

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Electrical Machines
A 4 pole 50 Hz induction motor is running at 1470 rpm. The frequency of rotor current is

 1 Hz
 0 Hz
 5 Hz
 50 Hz

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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?

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

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Electrical Machines
Hysteresis loss is proportional to

  f.
 f3.
 f1.5.
 f2.

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Electrical Machines
In a Dc generator the magnetic neutral axis coincide with geometrical neutral axis, when

  the generator runs on overload.
  the generator runs on full load.
  there is no load on the generator.
  the generator runs on designed speed.

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