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Electrical Machines

Electrical Machines
Total core loss is also called as -------------?

 Magnetic loss
 Copper loss
 Hysteresis loss
 Eddy current loss

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Electrical Machines
The armature shaft must be able to with stand

 Twisting stains due to transmission of torque.
 Any unbalanced magnetic pull on the armature core.
All of these
 Bending moment due to weight of the armature.

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Electrical Machines
In DC generators, the residual magnetism is of the order of

  2.5 %.
  15 %.
  20 %.
 10 %.

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

 copper alloy
 brass
 hard-drawn copper
 copper

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Electrical Machines
Which of the following motor is not suitable for frequent starting and stopping?

 Capacitor split phase motor
 Resistance split phase motor
All of these
 Capacitor run motor

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Electrical Machines
If starting current of a 3 - Φ induction motor is 5 times the rated current, while rated slip is 4 %, then ratio of starting torque to full load torque is

 0.6.
 0.8.
  1.
 0.4.

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