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Electrical Machines

Electrical Machines
The commutator segments of DC machines are made up of

 hard-drawn copper
 brass
 copper
 copper alloy

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Electrical Machines
A 4 pole dc motor with armature winding resistance of 0.6 ohm receives a supply of 230 Volt. If the back emf produced during running condition is equal to 210 volt. Calculate the current flowing through the armature at this point.

  43 Amp.
 44.47 Amp.
 29 Amp.
  33.33 Amp.

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Electrical Machines
In induction motor especially the cage rotors slots are nearly parallel to shaft axis. This is called

  cogging.
  skewing.
  slip.
  crawling.

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Electrical Machines
A DC series motor is running with a divertor connected across its field winding. If the divertor resistance is reduced then the speed of the motor will

 remain unaltered.
 become execessively high.
 increase.
 decrease.

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Electrical Machines
On switching a DC motor to DC supply mains, it is found to rotate in the direction opposite to that for which it is designed. The DC motor is

 have an equal number of electrons and protons.
 Series shunt.
 Cummulative compound.
  Differentical compound.

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Electrical Machines
When Flemings right hand rule to find the direction of induced emf, the thumb points towards

 opposite to the direction of motion of the conductor.
 direction of motion of the conductor.
 direction of induced emf.
 direction of flux.

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