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Electrical Machines

Electrical Machines
What is the increase in the torque expressed as percentage of initial torque, if current drawn by the dc series motor is increased from 10A to 11A?

 41%
 10%
 21%
 11%

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Electrical Machines
If starter is not used with large DC motor for starting, it will

 all of above.
 damage the armature and commutator.
 draw a starting current many times its rated full load current.
 provide execessive voltage drop in line.

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Electrical Machines
The output power of a dc motor is given by

  EbIa.
  EIa.
  EbIa2.
  none of these.

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Electrical Machines
Field weakening control method is used for the _________ ?

None of these
 below rated speed
 both A and B
 above rated speed

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Electrical Machines
The rotor of a 3 - Φ wound induction motor is provided with

  heavy copper or aluminium bars placed in rotor slots.
  heavy short-circuited end rings.
  three phase winding.
  single phase winding.

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Electrical Machines
The air gap between stator and the rotor of the 3 - φ induction motor is kept

  as small as possible.
  depends on the material of stator and the rotor.
  as wide as possible.
  air gap does not matter.

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