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Electrical Machines

Electrical Machines
In a resistance split phase motor, what is the range of torque angle?

 25° to 30°
 0°
 70° to 85°
 90°

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Electrical Machines
An unexcited single phase synchronous motor is

 reluctance motor.
 AC series motor.
 repulsion motor.
  universal motor.

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Electrical Machines
Two mechanically coupled alternators deliver power at 50 Hz and 60 Hz respectively. The highest speed of the alternators is

  3600 rpm.
  500 rpm.
  600 rpm.
  3000 rpm.

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Electrical Machines
Skewing of cage rotors offers the following advantages

  less noise.
  all of below.
  uniform torque.
  locking tendency is reduced.

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Electrical Machines
The direction of rotation of a DC compound motor can be reversed by interchanging

 shunt field connections.
 series field connections.
 armature or field connections.
 armature connections.

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Electrical Machines
Sparkless commutation can be achieved by employing

  any one or more of the above methods.
 compensating winding.
  high resistance carbon brushes.
  inter poles.

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