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Electrical Machines

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

 either increase or decrease
 increase
 decrease
None of these

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Electrical Machines
Direct-on-line (DOL) starters are not suitable for starting large DC motors, because

 the motor may run away.
 the starting torque becomes low.
 the motor may not start.
 the starting current will be enormously high.

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Electrical Machines
The material used for commutator brushes is mostly

 cast iron.
 mica.
 copper.
  carbon.

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Electrical Machines
In alternator, the rotary part is

 core.
  magnetic field poles.
 armature.
 none of these.

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Electrical Machines
In a loaded DC motor, if the brushes are given a shift from the interpolar axis in the direction of rotation, then the commutation will

 improve and the speed rises.
 deteriorate and the speed falls.
 deteriorate and the speed rises.
 improve and the speed falls.

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Electrical Machines
Current in a coil undergoing commutation is not able to get reversed completely by the end of commutation period. It is due to

None of these
  coil resistance.
  reactance voltage induced in the coil.
 armature emf.

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