DC Generators
The main drawback of a dc shunt generator is that

It is expensive
Terminal voltage drops considerably
Generated voltage is small
Shunt field circuit has high resistance

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

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