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Electrical Machines

Electrical Machines
The emf induced in a conductor rotating in a bipolar field is

 both of above.
None of these
 DC.
 AC.

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Electrical Machines
In dc machines, the armature windings are placed on the rotor because of the necessity for

 commutation
 development of torque
 generation of voltage
 electromechanical energy conversion

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Electrical Machines
R1 is the resistance of the primary winding of the transformer. The turn ratio in terms of primary to secondary is K. Then the equivalent resistance of the primary referred to secondary is

 R1 /K²
 K×R1
 R1 /K
 K²R1

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Electrical Machines
Which of following components of a DC generator plays vital role for providing direct electric current of a DC generator?

 Equalizer rings.
 Commutator.
 Eye bolt.
 Dummy coils.

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Electrical Machines
In a 12 pole triplex lap wound DC armature, each conductor can carry current of 100 A. The rated current of this armature is

 2400 A.
 600 A.
 1200 A.
  3600 A.

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Electrical Machines
The crawling in the induction motor is caused by

 high loads
 low voltage supply
 harmonics developed in the motor
 improper design of stator laminations

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