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Electrical Machines

Electrical Machines
At stand still condition the value of slip is

 1
 finite value
 infinite value
 0

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Electrical Machines
In a transformer maximum flux density is not constant, the eddy current loss varies as

 f²
 V
 f
 V²

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Electrical Machines
Field divertor method of speed control of a DC series motor gives speed above rated one due to reduction of

 None of above.
 Line current.
 Armature current.
 Field current.

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Electrical Machines
When the rotor of a 3 phase induction motor is blocked then the slip is

 0.7.
  1.
 0.3.
  0.54.

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Electrical Machines
The current drawn by a 220 V DC series motor of armature resistance 0.5 Ω and back emf of 200 V is

 400 A.
 40 A.
 44 A.
 440 A.

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Electrical Machines
Diverters are used only in

 shunt motors
 either of these
None of these
 series motors

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MORE MCQ ON Electrical Machines

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