Electrical Machines
Conservator tank is used

 to act as an oil storage.
 for better cooling of transformer.
None of these
 to take up the expansion of oil due to temperature rise.

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Electrical Machines
If the applied voltage of a certain transformer is increased by 50% and the frequency is reduced by 50%, the maximum flux density will (assuming that the magnetic circuit remains unsaturated)

 remain the same as the original
 changes to 1.5 times the original value
 changes to three times the original value
 changes to 0.5 times the original value

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