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Electrical Machines

Electrical Machines
The wattage rating of a ceiling fan motor will be

 200 - 250 W.
 250 - 500 W.
  50 - 150 W.
 10 - 20 W.

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Electrical Machines
What is the necessity of copper brushes in a dc motors?

  To convert alternating supply current to direct current.
  To absorb the mechanical shocks produced during running condition.
  None of these.
  To increase the flux cutting by the rotor.

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Electrical Machines
Under which of the following conditions is a dc motor provided with compensating winding used ? 1. Wide range of speed control above normal 2. Wide range of steady load variation with no speed control 3.Wide range of rapid variation in load Select the correct answer using the codes given below : Codes :

 1 and 2
 1, 2 and 3
 2 and 3
 1 and 3

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Electrical Machines
In which of the following DC Motor the ratio of starting torque to full load torque is minimum?

  Differential compound motor.
  Series motor.
  Cumulative compound motor.
  Shunt motor.

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Electrical Machines
In a DC generator the emf generated by the armature is maximum when

 shaft rotation is high.
 rate of change of flux is minimum.
 induced voltage is high.
  rate of change of flux is maximum.

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Electrical Machines
A dc shunt motor runs at a no-load speed of 1140 rpm. At full load, armature reaction weakens the main flux by 5% whereas the armature circuit voltage drops by 10%. The motor full-load speed in rpm is

 1200
 1203
 1080
 1000

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