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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?

 30.
  270.
 45.
 180.

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Electrical Machines
The direction of rotation of a DC compound motor can be reversed by interchanging

 armature or field connections.
 armature connections.
 series field connections.
 shunt field connections.

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Electrical Machines
In DC generator, brushes are always placed along

 armature axis.
 load axis.
 geometrical neutral axis.
  magnetic neutral axis.

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Electrical Machines
Two mechanically coupled alternators deliver power at 50 Hz and 60 Hz respectively. Highest speed of alternator is

 500 rpm.
 3600 rpm.
 3000 rpm.
  600 rpm.

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Electrical Machines
A motor operates in stable region at which of the following slip?

 low slip region
 unity slip
 high slip region
 both 1 and 2

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Electrical Machines
Magnetic field of a DC generator is produced by what?

 None of the options.
  Electromagnets.
 Permanent magnets.
 Both B and C.

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