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DC Generators

DC Generators
The yoke of a dc machine is made of

Aluminum
Silicon steel
Cast steel
Soft iron

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DC Generators
In case of dc machines, mechanical losses are primary function of

None of the listed here
Current
Speed
Voltage

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DC Generators
The copper loss is constant for

None of the listed here
Both shunt and compound generator
Series generator only
Shunt generator only

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DC Generators
The efficiency of a dc generator means its

None of the listed here
Mechanical efficiency
Overall efficiency
Electrical efficiency

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DC Generators
Carbon brushes are used in a dc machine because _______

None of the listed here
Contact resistance is decreased
Carbon lubricates and polishes the commutator
Carbon is cheap

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DC Generators
The armature of a dc machine is made of ______

Wrought iron
Cast steel
Soft iron
Silocon steel

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