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Electrical Machines

Electrical Machines
A DC generator without commutator is a

 AC generator
 DC motor
 DC generator
 induction motor

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Electrical Machines
Slot wedges in a dc machine is made up of

 mild steel.
 fibre.
 silicon steel.
 cast iron.

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Electrical Machines
In electric locomotives which of the following motor are used ?

 DC series motor.
 Synchronous motor.
 DC Shunt motor.
 DC compound motor.

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Electrical Machines
The slight curvature at the lower end of the OCC of a self excited DC generator is due to

  residual flux.
  high field resistance.
  high speed.
  magnetic inertia.

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Electrical Machines
In normal dc machines operating at full-load conditions, the most powerful electromagnet is

 field winding
 interpole winding
 interpole and compensating windings together
 armature winding

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Electrical Machines
Eb/V ratio of a DC motor is an indication of

  Effiency.
 Speed regulation.
 Running Torque.
 Starting torque.

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MORE MCQ ON Electrical Machines

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