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Electrical Machines

Electrical Machines
In a 3-phase induction motor, torque and supply voltage are related as

 T∝ V²
 T ∝ 1/V²
 T ∝ 1/V
 T ∝ V

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Electrical Machines
The flux is maximum in the following part of a DC motor:

 under the interpole.
 under trailing pole tip.
 pole core.
 under leading pole tip.

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Electrical Machines
For a 3-phase, 4 pole, 50 Hz synchronous motor the frequency, pole number and the frequency are halved. The motor speed will be

 3000 rpm
 375 rpm
 75 rpm
 1500 rpm

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Electrical Machines
The rotor electromotive force of the IM is observed to make 100 complete alterations per minute, calculated slip

  3.33 %.
None of these
 0 .001 %.
 3 %.

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Electrical Machines
Normally for the design of transformer the ambient temperature is taken as

 35°C.
 27°C.
 32°C.
  45°C.

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Electrical Machines
Dynamic braking is employed to brake

 both 1 and 2
 reversing drive
 non reversing drive
None of these

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MORE MCQ ON Electrical Machines

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