Discussion
The drawbacks of strain gauges are :
S1 : Low fatigue life
S2 : They are expensive, brittle and sensitive to temperature
S3 : Poor linearity
Answer: B
The official key is S2 and S3: the gauges are brittle and temperature sensitive, and they show poor linearity.
These two points describe semiconductor strain gauges, which have a large gauge factor but whose resistance changes non-linearly with strain, drift with temperature and are brittle and hard to bond. Sources found for the search agree on brittleness, temperature sensitivity and non-linearity.
What could not be confirmed: sources disagree on the cost of semiconductor gauges, which some call low and some high, and 'low fatigue life' (S1) was not found among the usual listed drawbacks. The key's S1-free answer, S2 and S3, is therefore kept; options containing S1 are rejected on that basis.
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