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Electrical Machines

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

  zero.
 positive.
 low.
 negative.

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Electrical Machines
A 10KVA auto transformer, turn ratio is 0.4. Find the power transferred inductively?

 10 KVA
 6 KVA
 4 KVA
 0 KVA

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

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

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Electrical Machines
The slip of an induction motor normally does not depend on which of the following?

 Shaft torque.
  Core loss component.
 Rotor speed.
 Synchronous speed.

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Electrical Machines
Semi closed slots or totally closed slots are used in induction motors, essentially to

 decrease starting torque
 improve starting torque
 increase pull out torque
 reduce magnetising current and improve power factor

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Electrical Machines
What is/are the necessary conditions for parallel operation of alternators?

 Both 1and 2
 Terminal voltage is same
 Speed of alternators should be same
 Frequency should be same

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