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Electrical Machines

Electrical Machines
The output power of any electrical motor is taken from the

 Coupling mounted on the shaft.
 Field.
 Motor frame.
 Armature.

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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.
  single phase winding.
  heavy short-circuited end rings.
  three phase winding.

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Electrical Machines
If an additional resistance is connected in series with a DC series motor operating at rated speed, the speed of the motor will

 Remain unaltered.
 Oscillate around the normal speed.
 Increase.
 Reduce.

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Electrical Machines
DC generators are usually designed to develop armature voltages not exceeding 650 V because of the limitations imposed by

 armature winding
 field winding
 commutator
 starters

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Electrical Machines
To have sparkless commutation, the armature reaction effect in a DC machine is neutralized by

  compensating winding and commutating poles.
 fixing the brush axis inline with the pole axis.
 increasing field excitation.
 shifting the brush axis from GNA to MNA.

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Electrical Machines
In DC machine shape of main field flux distribution is?

 saddle shape
 triangular
 flat tapped or trapezoidal
 peaky in nature

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MORE MCQ ON Electrical Machines

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