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Electrical Machines

Electrical Machines
Swinburne test is conducted under which of the following condition?

 no load
 full load
 half load
 any of the above

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Electrical Machines
Two transformers with identical rating, are designed with flux densities of 1.2 and 1.4 Wb / m2 respectively. The weight of first transformer per kVA is

 less than that of second transformer.
  more than that of second transformer.
 equal to that of second transformer.
 none of these.

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Electrical Machines
A 4 pole 50 Hz induction motor is running at 1470 rpm. What is the slip value?

 0.2
 0.4
 0.04
 0.02

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Electrical Machines
A frog leg winding is used in a DC machine to eliminate

 the use of compensating winding.
 the use drum winding.
  the use equalizer in lap winding.
 reactance voltage produced due to communication.

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Electrical Machines
If we increase the rotor reactance value, the maximum torque will

 increase
 not changed
 decrease
None of these

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Electrical Machines
Fufuraldehyde analysis is done to determine the

 condition of cork gaskets used in transformer.
 condition of lamination on CRGO steel sheet.
  condition of paper insulation in transformer.
 condition of oil in transformer.

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