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Electrical Machines

Electrical Machines
In a 3-phase induction motor, torque and supply voltage are related as

 T ∝ V
 T ∝ 1/V
 T∝ V²
 T ∝ 1/V²

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Electrical Machines
An unexcited single phase synchronous motor is

 repulsion motor.
  universal motor.
 reluctance motor.
 AC series motor.

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Electrical Machines
Slip rings of an induction motors are made of

  stainless steel.
  carbon.
  phosphor bronze.
  aluminium.

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Electrical Machines
A triangular mmf wave is produced in the air gap of an electric machine. Such wave is produced by

 rotor of a dc machine.
 rotor of an synchronous machine.
 stator of a induction machine.
 stator of a dc machine.

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Electrical Machines
If the full load speed of 3-phase, 50Hz induction motor is 950 rpm, what is its half load speed nearly equals to?

 1000 rpm
 940 rpm
 975 rpm
 950 rpm

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Electrical Machines
In DC generators, electric current to the external circuit from armature is given through

 none of above.
 solid connection.
 commutator.
 slip rings.

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MORE MCQ ON Electrical Machines

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