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Electrical Machines

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

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

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Electrical Machines
Hunting in a synchronous motor takes place

  when power factor is unity.
  motor is under loaded.
  when load varies.
  when supply voltage fluctuates.

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Electrical Machines
Universal motors are used in

 food processing
 traction
All of these
 cranes

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Electrical Machines
Maximum allowable acidity level of power transformer insulating oil is generally taken as

 2 mg of KOH / gm.
 0.5 mg of KOH / gm.
  1 mg of KOH / gm.
  0.3 mg of KOH / gm.

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Electrical Machines
In DC machine shape of main field flux distribution is?

 saddle shape
 peaky in nature
 flat tapped or trapezoidal
 triangular

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Electrical Machines
Voltage across the open circuited field termninals of a synchorous machine under slip test is

 DC.
  DC of slip frequency.
 AC of supply frequency.
 A modulated supply frequency AC voltage with slip frequency envelop.

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