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Electrical Machines

Electrical Machines
In DC machine torque depends on which of the following?

 armature current (I)
 both A and B
 speed
 flux (φ)

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Electrical Machines
In escalator which motor is used?

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

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Electrical Machines
Dissolve gas analysis of transformer oil is carried out to determine

 condition of bushings.
 condition of transformer oil.
 condition of bushing stud.
  condition of transformer.

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Electrical Machines
On what factors the speed of dc motor depends?

 Armature current Ia.
 All of these.
 Applied voltage.
 Field flux.

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Electrical Machines
Open circuit in a transformer is prefered with

 rated transformer current
 high frequency supply
 direct current
 rated transformer voltage

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Electrical Machines
The efficiency of a transformer is mainly dependent on

 stray losses.
 dielectric losses.
 copper losses.
 core losses.

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MORE MCQ ON Electrical Machines

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