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Electrical Machines

Electrical Machines
In an auto transformer, for what value of turn ratio, power transferred by inductively and conductively are same?

 any of the above
 0
 1
 0.5

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Electrical Machines
The frame of an induction motor is made of

  stainless steel.
  aluminium.
  silicon steel.
  closed grained cast iron.

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Electrical Machines
In a 12 pole triplex lap wound DC armature, each conductor can carry current of 100 A. The rated current of this armature is

 600 A.
  3600 A.
 2400 A.
 1200 A.

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Electrical Machines
If Pi and Pc represent core and full load copper loss respectively, the maximum KVA delivered to load corresponding to maximum efficiency is equal to rated KVA is

 √(Pi/Pc)
 Pi/Pc
 Pc/Pi
 (Pi/Pc)2

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Electrical Machines
Alternator operates on the principle of

  mutual induction.
  electromagnetic induction.
  self induction.
  self or mutual induction.

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Electrical Machines
The speed of a 3-phase induction motor operating in its stable region

 remains constant.
 decreases with increase in the load torque.
 increases with increase in the load torque.
 decreases with decrease in the load torque.

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