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Electrical Machines

Electrical Machines
The noise resulting from vibrations of lamination set by magnetic forces, is termed as

 magnetostriction.
 boo.
  hum.
 zoom.

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Electrical Machines
In above questions, find the power delivered by each of the alternators to a load of impedance 6Ω(resistive)

 1000 W, 5040 W.
 6000 W, 7000 W.
 100 W, 2000 W.
  3190 W, 5040 W.

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Electrical Machines
The output voltage of a DC generator is

 E = V – IaRa.
  E = V + IaRa.
 E = V + Ra.
 E = V + Ia.

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Electrical Machines
stepped cores are used in transformers in order to reduce

 volume of copper.
 volume of iron.
 reluctance of core.
 iron loss.

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Electrical Machines
The armature resistance of the dc motor is generally of the range

  0.5 ohm.
  0.1 ohm.
 50 ohm.
 100 ohm.

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Electrical Machines
Synchronous condensers are used to

All of these
 improve starting torque
 improve the power factor
 reduce hunting

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MORE MCQ ON Electrical Machines

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