DC Generators
Open circuited armature coil of a D.C. machine is

Both of the listed here
Identified by the scarring of the commutator segment to which open circuited coil is connected
None of these
Indicated by a spark completely around the commutator

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DC Generators
In a dc generator, the eddy current power loss is

Directly proportional to sqaure of thickness of each lamination
None of the listed here
Inversely proprtional to thickness of each lamination
Directly proportional to thickness of each lamination

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DC Generators
In D.C. generators the polarity of the interpoles

Is the same as that of the immediately preceding pole
Is the same as that of the main pole ahead
Is opposite to that of the main pole ahead
Is neutral as these poles do not play part in generating e.m.f.

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