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Electrical Machines

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

 decrease
 increase
 either increase or decrease
None of these

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Electrical Machines
In synchronous motor the torque is proportional to

 P²
 1/P
 Power P
 1/P²

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Electrical Machines
A 4 pole dc generator is running at 1500 rpm the frequency of current in the armature winding is

 100Hz.
 150Hz.
 200Hz.
 50Hz.

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Electrical Machines
If the number of rotor slots is equal to number of stator slots, then motor refuses to start. Hence it is known as

  relative speed.
  crawling.
  air gap.
  cogging.

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Electrical Machines
Which of the following generators are used in arc welding?

 series generators
 shunt generators
 cumulative compound generators
 differential compound generators

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Electrical Machines
In an auto-transformer, power is transferred through

None of these
 both A and B.
 conduction process only.
 induction process only.

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