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Electrical Machines

Electrical Machines
The output power of any electrical motor is taken from the

 Armature.
 Field.
 Coupling mounted on the shaft.
 Motor frame.

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Electrical Machines
DC shunt motors are suitable for

  All of this.
 Lathes.
 Blowers and fans.
 Centrifugal pumps

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Electrical Machines
Synchronising power of a synchronous motor varies

All of these
 inversely as 1/Xs
 directly as Xs2
 directly as synchronous reactances Xs

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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

 commutator
 armature winding
 field winding
 starters

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Electrical Machines
A motor armature conductor of length 0.5 m is exposed to a flux density of 4 Wb / m2. Calculate the force experienced by the conductor, when the armature current is 5 Amp?

  15 N.
 20 N.
  Can't be determined.
  None of these.

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Electrical Machines
The speed of rotation of 5th harmonic component in the stator of an induction motor is

 (1 / 15) times the synchronous speed.
  0.5 times the synchronous speed.
  (1 / 5) times the synchronous speed.
 5 times the synchronous speed.

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