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

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

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

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

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