Electrical Machines
Two identical loss less series motors connected in series across a dc supply voltage, runs at speed of N1 and N2, then ratio of their output power is

 N1 : N2.
 N12 : N22.
 1 : 1.
 none.

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Electrical Machines
For an ideal transformer the winding should have

 no ohmic resistance on either side
 minimum resistance on primary side and maximum resistance on secondary side
 maximum resistance on primary side and least resistance on secondary side
 equal resistance on primary and secondary side

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