Discussion
Match the pairs :
| Set I | Set II |
|---|---|
| (a) Piezo-electric | (i) Temperature measurement |
| (b) Foil strain gauge | (ii) Displacement measurement |
| (c) Beta gauge | (iii) Pressure measurement |
| (d) LVDT | (iv) Thickness measurement |
Answer: C
The answer is (a)-(iii), (b)-(i), (c)-(iv), (d)-(ii), as the key gives. Three pairs are firm and the fourth is forced.
A piezo-electric element converts pressure or force to charge, so (a) goes with pressure. A beta gauge measures thickness from how far a sheet absorbs beta radiation, so (c) goes with thickness. An LVDT (linear variable differential transformer) measures displacement, so (d) goes with displacement.
That leaves temperature for the foil strain gauge. A strain gauge normally measures strain, and through it force or pressure, and temperature enters only as an error to be compensated, so the pairing is the paper's forced match rather than a natural one. No other option can be consistent with the three firm pairs: option A makes the piezo-electric element a thickness sensor, option B makes the beta gauge a temperature sensor, and option D pairs every item wrongly.
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