Discussion
Mu-metal is used in which of the following applications?
Answer: B
Mu-metal is a nickel-iron alloy of very high magnetic permeability, so it conducts magnetic flux well and screens against stray magnetic fields. The key gives instrument transformers as the application, since the high permeability and low losses suit their cores, and the metal is also used as a magnetic shield. It is not used for induction type relays, for the field and armature of DC machines, which use steel and silicon steel, or for the star-delta starter. The answer is Instrument transformers, option (B).
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