Electrical Machines
In a single phase transformer the magnitude of leakage reactance is twice that of resistance of both primary and secondary. With secondary short circuited, the input power factor is

 1/√2
 1/√5
 1/3
 2/√5

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Electrical Machines
Two dc machines A and B, using the same conductor material, have armature circuit resistances of 0.4 Ω and 1.2 Ω respectively. Of the two machines,

 B is bigger than A for the same current rating
 A is bigger than B for the same current rating
 A is bigger than B for the same voltage rating
 both are of the same size for the same current rating

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Electrical Machines
What is/are the necessary conditions for voltage build up in self excited generator?

 Poles should contain residual flux.
 Field winding resistance should be less than critical resistance.
All of these
 Field winding should be properly connected to armature winding.

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