Discussion
In small DC generators, where cost rather than weight is the main consideration, yokes are made of ______.
Answer: A
The yoke of a DC machine is the outer frame that carries the field poles and the magnetic flux. In small machines, where cost matters more than weight, it is made of cast iron, which is cheap and easy to cast into shape. In large machines, where weight matters, cast steel or rolled steel is used instead because of its better magnetic properties.
Aluminium, copper and German silver are not magnetic materials, so they cannot carry the main flux of a machine. The answer is cast iron, option A.
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