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Electrical Machines

Electrical Machines
Universal motor have which of the following application?

  Food mixer.
  Traction.
  Lift.
  Domestic pump.

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Electrical Machines
The armature core of a DC machine is laminated to minimise

 mechanical loss
 temperature rise
 hysteresis loss
 eddy-current loss

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Electrical Machines
The output power of a dc motor is given by

  EbIa2.
  EIa.
  EbIa.
  none of these.

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Electrical Machines
In a synchronous machine, if φ is the flux per pole and f is the frequency of the emf induced E then

 E ∝ φf
 E ∝ f/φ
 E ∝ 1/(φf)
 E ∝ φ/f

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Electrical Machines
A DC compound motor has

 only shunt field winding.
 both shunt and series field winding.
 only series field winding.
 tertiary winding.

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

None of these
 pulsating and unidirectional
 oscillating
 steady and unidirectional

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