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Electrical Machines

Electrical Machines
In a transformer which of the following losses are zero?

 Iron loss
All of these
 Rotational loss
 Copper loss

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Electrical Machines
Under which of the following conditions hunting of synchronous motor is likely to occur ?

  Over-excitation.
  Periodic variation of load.
  Small and constant load.
  Over-loading for long period.

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Electrical Machines
A cumulatively compounded dc motor delivers rated load power at rated speed. If the series field is short-circuited, then

 Ia increases and ωm decreses
 both decrese
 both armature current Ia and speed ωm increase
 Ia remains constant but ωm increase

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Electrical Machines
Which 1 - Φ motor does operate at high power factor?

  Capacitor run.
  Capacitor start.
  Shaded pole.
  Split phase.

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Electrical Machines
Which of the following statements is/are correct ?

 Inter pole winding will act in interpolar region.
 Compensating winding will act under the pole.
None of these
 Both A and B.

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

  none of these.
  EIa.
  EbIa.
  EbIa2.

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