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Electrical Machines

Electrical Machines
Open circuit test on transformer gives

 eddy current loss
 hysteresis loss
 copper loss
 both 1and 2

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Electrical Machines
Induction motors have the advantage of

  simple in construction.
  less maintenance.
  all of below.
  less cost.

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Electrical Machines
A DC cumulatively compounded motor delivers rated load torque at rated speed. If the series field is short-circuited, then the armature current and speed will

 both decrease
 both increase
 increase and decrease respectively
 decrease and increase respectively

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Electrical Machines
Breadth factor is defined as the ratio of

None of these
 emf with concentrated winding to emf with distributed winding.
 emf with distributed winding to emf with concentrated winding.
 both 1 and 2.

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Electrical Machines
In escalator which motor is used?

  DC shunt motor.
  Universal motor.
  1 - φ IM.
  3 - φ IM.

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

 decrease
 either increase or decrease
 increase
None of these

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MORE MCQ ON Electrical Machines

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