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Electrical Machines

Electrical Machines
From no load to full load the slip will

None of these
 slightly decrease.
 not change.
 slightly increase.

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Electrical Machines
Which of the following transformer insulating oil generally used in India?

 Aromatics based insulating oil.
 Olefin based insulating oil.
 Naphtha based insulating oil.
  Paraffin based insulating oil.

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Electrical Machines
When an electric train is moving down a hill, the DC motor will operate as

  DC series generator.
  DC series motor.
 DC shunt motor.
 DC shunt generator.

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Electrical Machines
Which of the following statement is correct, if short circuit ratio is high?

 Good voltage regulation
 High voltage regulation
None of these
 Low short circuit current

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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

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

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Electrical Machines
The direction of generated emf in the armature coil of a DC machine is 1. the same as that of the current in a generator 2. the same as that of the current in a motor 3. opposite to that of the current in a generator 4. opposite to that of the current in a motor From these, the correct answer is

 2, 3
 2, 4
 1, 4
 1, 3

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