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Electrical Machines

Electrical Machines
The speed of stator rotating magnetic field (RMF) with respect to rotor is

 S.Ns
 Ns
 Nr
 Zero

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Electrical Machines
A 240 V, dc shunt motor draws 15 A while supplying the rated load at a speed of 80 rad/s. The armature resistance is 0.5 W and the field winding resistance is 80 W. The external resistance to be added in the armature circuit to limit the armature current to 125% of its rated value is

 15.1 Ω
 15.9 Ω
 31.9 Ω
 31.1 Ω

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Electrical Machines
In a seperately excited DC Motor if field current is increased, it will

 Increase speed
 Reduce starting torque.
 Reduce armature heating.
 Increase acceleration duration.

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

 greater than
 any of the above
 less than
 equal to

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Electrical Machines
Maximum allowable acidity level of power transformer insulating oil is generally taken as

 2 mg of KOH / gm.
 0.5 mg of KOH / gm.
  0.3 mg of KOH / gm.
  1 mg of KOH / gm.

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Electrical Machines
The stator core of a 3 - Φ induction motor is laminated in order to reduce the

  eddy current loss.
  both of the above.
  hysteresis loss.
  weight of the stator.

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