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Electrical Machines

Electrical Machines
Flux density under leading pole tips in case of generator will

 decrease
 increase
 either increase or decrease
None of these

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Electrical Machines
A 6 pole lap connected DC generator with 480 conductors has armature resistance of 0.06 Ω. If the conductors are reconnected to from a wave winding other things remaining unchanged, the value of armature resistance will be

 0.01 Ω.
  0.54 Ω.
 0.06 Ω.
 0.54 Ω.

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Electrical Machines
A DC generator can be considered as

 rectifier.
 prime mover.
 power pump.
 rotating amplifier.

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Electrical Machines
In a DC Shunt Motor if the load current increases then field flux

 decreases
 remains constant.
 increases.
 decreases.

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Electrical Machines
Short circuiting is caused in the armature winding due to

  grounding of two or more turns of the same coil.
  failure of insulation between two turns of coil.
  any of above.
 failure of insulation between two commutator bars.

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Electrical Machines
In an induction motor, air gap power is 10 Kw and mechanically developed power is 8 Kw. What are the rotor ohmic losses?

 2KW
 3KW
 0.5Kw
 1.5KW

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