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Electrical Machines

Electrical Machines
The material used for commutator brushes is mostly

  carbon.
 copper.
 mica.
 cast iron.

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Electrical Machines
Shunt field of DC generators consists of--------number of turns and ---------- conductors respectively

 large and thick
 less and thick
 large and thin
 less and thin

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Electrical Machines
To increase starting torque of a 3-phase slip ring induction motor, preferred method is to increase

None of these
 supply voltage
 supply frequency
 rotor resistance

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Electrical Machines
The interpoles in dc machines have a tapering shape in order to

 increase the acceleration of commutation
 reduce the overall weight
 reduce the saturation in the interpole
 economise on the material required for interpoles and their windings

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Electrical Machines
Slip rings of an induction motors are made of

  carbon.
  aluminium.
  stainless steel.
  phosphor bronze.

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Electrical Machines
In a single phase induction motor, the starting torque developed is proportional to

 1/V²
 supply voltage V
 1/V
 V²

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MORE MCQ ON Electrical Machines

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