DC Generators
For a D.C. machines laboratory following type of D.C. supply will be suitable

Mercury are rectifier
Rotary converter
Induction motor D.C. generator set
Synchronous motor D.C. generator set

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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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