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Electrical Machines

Electrical Machines
Maximum efficiency will occur, when copper loss is_______to iron loss?

 greater than
 less than
 any of the above
 equal to

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Electrical Machines
The armature core of the rotor bars of dc motors are laminated

  to reduce eddy current loss.
  to reduce hysteresis loss.
  to provide better flux linkage.
  to reduce mechanical losses.

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Electrical Machines
When a transformer is loaded, the secondary terminal voltage drops. That means power factor is

  lagging.
 unity.
 zero.
 leading.

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Electrical Machines
If s is the slip and f is the supply frequency of an induction motor, the frequency of rotor current is given by

  f / s.
  sf / 2.
  s2.
  sf.

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

 brass
 hard-drawn copper
 copper alloy
 copper

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Electrical Machines
In a DC Motor 3 point starter is used to

 all of above.
 provide overload protection.
 limit the starting current to a safer value.
 provide protection against Low-Voltage.

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