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Electrical Machines

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

 parabola
 any of the above
 linearised
 hyperbola

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Electrical Machines
The low voltage winding of a 400/230 V single phase 50 Hz transformer is to be connected to keep the magnetization current at the same level in both the cases the voltage at 25 Hz should be

 115 V
 230 V
 460 V
 65 V

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Electrical Machines
At what power factor, the voltage regulation of a transformer can be zero ?

  Leading power factor.
 Unity power factor.
 Zero power factor.
 Lagging power factor.

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Electrical Machines
The DC compound motors are generally

 Cummulative compound.
 Level Compound.
 Differentical compound.
 None of these.

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Electrical Machines
A DC shunt generator builds up 230 V when driven in clockwise direction. In case it is driven in anti clockwise direction, other things remaining unchanged, then the voltage build up is

 some what less than 230 V
 230 V
 some what more than 230 V
 not possible

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Electrical Machines
In IM the rotor lamination can be ________________ than stator laminations.

  sipper.
  rotor can not have any laminations.
  thicker.
  thinner.

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