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Electrical Machines

Electrical Machines
The emf induced in a conductor rotating in a bipolar field is

 DC.
 AC.
 both of above.
None of these

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Electrical Machines
The rotor speed of an induction motor is given by

None of these
  Ns = 120f /p × ( 1 - r).
  Nr = 120f / p × (1-s).
  Ns = 120f / p × ( 1 - s ).

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Electrical Machines
No load test on induction motor is conducted to find which of the following losses?

All of these
 Stator copper loss
 Stator core loss
 Rotational loss

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Electrical Machines
If the mechanical angle α between the stator and rotor poles increases, then the stator current

 None of above.
 Remains unchanged.
  Increases.
 Decreases.

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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

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

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Electrical Machines
A DC series motor is accidentally connected to single phase ac supply voltage. The torque produced will be

 oscillating
 pulsating and unidirectional
 steady and unidirectional
None of these

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