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Electrical Machines

Electrical Machines
The torque speed characteristics of a AC servomotor is approximately

 any of the above
 hyperbola
 parabola
 linearised

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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.
 Armature current.
 Line current.
 Field current.

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Electrical Machines
A 500 V, 55 kVA single phase alternator has an effective resistance of 0.5 Ω. An excitation current of 10 A produces 200 A armature current on short circuit and an emf of 450 V on per circuit. The synchronous reactance will be

 25.564 Ω.
  2.241 Ω.
 2.781 Ω.
 2.74 Ω.

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Electrical Machines
Which of the following represents the pitch factor?

 Cos α²
 Cos (α/2)
 sin (α/2)
 Cos α

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Electrical Machines
A smaller air gap in a induction motor helps to

 reduce the magnetizing current.
 reduce the chance of crawling.
 increase the starting torque.
 reduce the chance of cogging.

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

  45°C.
 32°C.
 27°C.
 35°C.

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MORE MCQ ON Electrical Machines

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