Discussion
The shunt field resistance of DC machines comes under the category of:
Answer: B
The shunt field winding of a DC machine is made of many turns of fine wire, and its resistance is much higher than that of the armature or series winding, but it is still only tens to a few hundred ohms. In the usual classification of resistances into low (below 1 ohm), medium (about 1 ohm to 100 kilo-ohm) and high, it falls in the medium class, which is the key's answer, option (B). It is not low resistance like the series field or armature, and it is not high or very high like insulation resistance.
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