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Electrical Machines

Electrical Machines
A 4-pole generator with 16 coil has a two layer lap winding. The pole pitch is

 16.
  4.
 32.
 8.

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Electrical Machines
If a DC Series motor is connected across an AC supply it will

 run at lower speed.
 run at normal speed.
 burn.
 not run.

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Electrical Machines
A dc shunt generator has full-load voltage regulation of 10% at rated speed of 1000 rpm. If it is now driven at 1250 rpm, then its voltage regulation at full load would

 remain unchanged
 be less than 10%
 be 12.5%
 be more than 10%

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Electrical Machines
Armature of DC machine is made of

 silicon steel.
 insulating material.
 non-ferrous material.
 conducting material.

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Electrical Machines
If the speed of a dc motor increases with load torque, then it is a

 series motor
 differentially compounded motor
 permanent magnet motor
 comulatively compounded motor

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Electrical Machines
In DC generators, the cause of rapid brush wear may be

 severe sparking.
 imperfect contact.
 any of above.
 rough commutator surface.

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