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Electrical Machines

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

 T∝ V²
 T ∝ V
 T ∝ 1/V²
 T ∝ 1/V

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Electrical Machines
Ward-Leonard control is basically a ___________ control method.

 Field diverter control.
 Field control.
 Armature resistance control.
 Armature voltage control.

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Electrical Machines
Width of a carbon brush should be equal to

 less than the width of commutator segment.
 the width of the 1 to 2 commutator segment.
 the width more than 3 commutator segment.
 the width of the 2 to 3 commutator segment.

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Electrical Machines
Which of the following relation is correct?

 Xd < Xq.
 Xd = Xq.
None of these
 Xd > Xq.

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Electrical Machines
Direct axis reactance is defined as the ratio of

 Vmin to Imin
 Vmax to Imax
 Vmax to Imin
 Vmin to Imax

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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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MORE MCQ ON Electrical Machines

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