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Electrical Machines

Electrical Machines
Oil is provided in an oil filled transformer for

 cooling.
 lubrication.
  both cooling and insulation.
  insulating.

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Electrical Machines
High inrush of current during a starting of DC motor can efficiently be restricted to a safer value by increasing the _________________ resistance.

 none of above
 shunt field
 both A and B
 armature circuit

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Electrical Machines
To eliminate 5th harmonic in the induced voltage phase breadth should be

 18°
 30°
 36°
 72°

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Electrical Machines
In circle diagram for induction motor, diameter of circle represents which of the following ?

 Running torque.
 Rotor current.
 Line voltage.
 Slip.

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Electrical Machines
The torque developed in IM is nearly proportional to

  V2.
  1 / V.
 1 / V2.
  V.

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Electrical Machines
The armature shaft must be able to withstand

 any unbalanced magnetic pull on the armature core.
All of these
 bending moment due to weight of the armature.
 twisting strains due to transmission of torque.

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