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Electrical Machines

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

 T∝ V²
 T ∝ 1/V
 T ∝ V
 T ∝ 1/V²

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Electrical Machines
Reversing the direction of rotation of split phase motors is done by

 reversing the terminals of main winding.
 reversing the terminals of starting winding.
All of these
 interchanging the capacitor from starting winding to main winding or vice versa.

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Electrical Machines
In a single phase induction motor, the starting torque developed is proportional to

 1/V
 V²
 1/V²
 supply voltage V

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Electrical Machines
For higher values of armature, the speed of a DC series motor is

 Proportional to armature current.
  Constant.
 Proportional to the square of armature current.
 Inversely proportional to armature current.

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Electrical Machines
The fall in speed of the DC generator due to increase in load can be corrected by

 cooling the armature.
  reducing the load voltage.
  increasing the excitation.
  increasing the input to the prime mover.

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Electrical Machines
For a specific open-circuit voltage of a DC generator, the short-circuit electric current will be maximum when it is

  cumulatively compounded.
  separately excited.
 differentially compounded.
  shunt connected.

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MORE MCQ ON Electrical Machines

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