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Electrical Machines

Electrical Machines
An ideal DC generated is one that has _____________ voltage regulation.

 negative.
 low.
  zero.
 positive.

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Electrical Machines
When a DC cummulative compound wound motor is loaded

 Torque and speed both increase.
  Torque increase and speed decrease.
 Both torque and speed decrease.
 Torque decrease and speed increases.

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Electrical Machines
In a dc machine, the demagnetizing effect of armature reaction is due to

 non-sinusoidal nature of armature mmf
 magnetic saturation in half of the field pole
 component of armature mmf along field axis
 uneven air-gap length

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Electrical Machines
A 3 - Φ, 12 pole, 600 V, 50 Hz star connected IM has rotor resistance and stand still resistance of 0.03 Ω and 0.5 Ω respectively. The speed of maximum torque will be

 450 rpm.
 540 rpm.
  470 rpm.
  240 rpm.

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Electrical Machines
Which of the following statements is/are correct ?

 Compensating winding will act under the pole.
 Both A and B.
None of these
 Inter pole winding will act in interpolar region.

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Electrical Machines
A synchronous motor will deliver maximum power when

  input power factor is unity.
  load angle is equal to internal angle θ.
  load angle is 0°.
  load angle is 45°.

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