Correct answer: (B) Puddling index; (D) Reel index
Explanation
Cone index is penetration force divided by area and has pressure units. Puddling index is a ratio characterizing soil suspension/settling, and reel index is reel peripheral speed divided by forward speed, both dimensionless. The source’s machinery performance index has dimensional factors. Thus official **B, D**; the generic phrase performance index can mean other definitions, so its dimensionality is context-dependent.
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