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Electrical Machines

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

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

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Electrical Machines
In which of the following motors DC excitation is not required?

 3-phase synchronous motor
 reluctance motor
 hysteresis motor
 3-phase synchronous generator

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Electrical Machines
Commutator in DC generator is used for

 increase efficiency
 convert AC armature current in to DC
 reduce losses
 collecting of current

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Electrical Machines
Semi closed slots or totally closed slots are used in induction motors, essentially to

 improve starting torque
 reduce magnetising current and improve power factor
 decrease starting torque
 increase pull out torque

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Electrical Machines
On which of the following factor/factors the speed of a DC motor depends upon?

 Applied voltage.
 Armature current.
 Field flux.
 All of these.

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Electrical Machines
Addition of 0.3 % to 4.5 % silicon to iron

None of these
  reduces the saturation magnetization.
  increases the hysteresis loss.
  increases the electrical resistivity of iron.

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