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Electrical Machines

Electrical Machines
In a 6 pole DC machine, 90 mechanical degrees correspond to which of the following electrical degree?

 180.
  270.
 30.
 45.

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Electrical Machines
DC generators are usually designed to develop armature voltages not exceeding 650 V because of the limitations imposed by

 field winding
 starters
 armature winding
 commutator

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Electrical Machines
The direction of generated emf in the armature coil of a DC machine is 1. the same as that of the current in a generator 2. the same as that of the current in a motor 3. opposite to that of the current in a generator 4. opposite to that of the current in a motor From these, the correct answer is

 2, 4
 1, 4
 2, 3
 1, 3

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Electrical Machines
If the field connection of a DC Shunt Motor is changed then

 it will run in opposite direction.
 motor will not run.
 it will run in same direction by slowly.
 it will run in same direction.

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Electrical Machines
Width of a carbon brush should be equal to

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

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Electrical Machines
The speed of stator rotating magnetic field (RMF) with respect to rotor is

 S.Ns
 Nr
 Zero
 Ns

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