Electrical Machines
For a standard frequency the machine operates at a particular speed known as

 normal speed.
 any of the above.
 synchronous speed.
 slip speed.

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Electrical Machines
The following statements relate to compensating winding (CW) and interpole winding (IW) of a dc machine : 1. CW neutralizes the armature reaction under a pole pitch 2. IW is connected in series with armature circuit 3. IW produces mmf in the commutating zone only 4. CWmmf is directed along the brush axis 5. Mmf produced by IW is equal to armature mmf From these, the correct statements are

 2, 3, 4
 1, 3, 4, 5
 2, 3, 4, 5
 1, 2, 3, 4 and 5

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Electrical Machines
For an ideal transformer the winding should have

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

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