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Electrical Machines

Electrical Machines
In a dc machine 72 number of coils are used. Find the number of commutator segments required?

 36
 37
 74
 72

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Electrical Machines
A 4 pole 50 Hz 1-phase induction motor is running at 1470 rpm. Find the forward and backward slips?

 0.02, 1.98
 0.04, 1.96
 0.02, 0.98
 0.04, 0.96

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Electrical Machines
The sparking at the the brushes, in a DC machines is due to

 presence of commutator.
 high resistance of carbon brushes.
  reactance voltage.
 armature reaction.

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Electrical Machines
Resistance commutation is used generally in case of

  fractional kW DC machines.
 DC machines above 10 kW.
None of these
 DC machines bellow 5 kW.

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Electrical Machines
A 8 pole, 50 Hz single phase induction motor is running at 690 rpm. Its slip with respect to forward field is

 1.92
 -1.92
 0.08
 -0.08

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Electrical Machines
In DC generator, full form of MNA is what?

 Magnetic neutral armature co-ordinate.
 Magnetic no-load axis.
  Magnetic neutral axis.
 Magnetically no-load armature co-ordinate.

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