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Electrical Machines

Electrical Machines
In DC motors, under trailing pole tips, flux density will_______ ?

 increase
 decrease
 either increase or decrease
None of these

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Electrical Machines
In case the conditions for maximum power for DC motor are established, the efficiency of the motor will be

 Around 100 %.
 Any where between 75 % and 90 %.
 Less than 50 %
 Around 90 %

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Electrical Machines
If residual magnetism of a shunt generator is destroyed accidentally it may be restored by connecting its shunt field

 in reverse.
 to an AC source.
  to a DC source.
 to earth.

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Electrical Machines
Satisfactory commutation of DC machine requires

All of these
 brushes should be of proper grade and size.
 brushes should smoothly run in the holders.
 smooth, concentric commutator properly undercut.

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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.
  mechanical losses.
  ohmic losses.

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Electrical Machines
The demagnetising component of armature reaction in a DC generator

  reduces inter poles flux density.
  reduces generator emf.
  results in sparking trouble.
  increases armature speed.

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