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Electrical Machines

Electrical Machines
Commutator pitches of duplex and simplex lap windings are respectively

 2 and 2
 2 and 1
 4 ang 1
 4 and 2

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Electrical Machines
In DC generator, the electricity produced in armature is

  armature is not present in DC generator.
  AC.
None of these
  DC.

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Electrical Machines
1 KVA, 230 V, 50 Hz, single phase transformer has an eddy current loss of 30 watts. The eddy current loss when the transformer is excited by a dc source of same voltage will be

 zero watt
 more than 30 W
 less than 30 W
 30 W

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Electrical Machines
The armature shaft must be able to with stand

All of these
 Twisting stains due to transmission of torque.
 Any unbalanced magnetic pull on the armature core.
 Bending moment due to weight of the armature.

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Electrical Machines
The shaft torque of a dc motor is less than the electromagnetic torque because of

  eddy current losses.
  hysteresis losses.
  ohmic losses.
  mechanical losses.

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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

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

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