Following two groups of equipment and their working principles or purpose are given:
| Group I (Equipment) | Group II (Working Principle / Purpose) |
|---|---|
| (i) Pneumatic conveyor | (a) Air blowing or suction |
| (ii) Hammer mill | (b) Feed grinding |
| (iii) Cyclone separator | (c) Centrifugal force |
| (iv) Pycnometer | (d) Stress/strain measurement |
Identify the incorrect pair:
Options:
(A) i – a
(B) ii – b
(C) iii – c
(D) iv – d
Official Answer Key:
D
Step-by-Step Solution & Explanation
(i)pneumatic conveyor–air blowing/suction ✓; (ii)hammer mill–feed/material grinding ✓; (iii)cyclone separator–centrifugal force ✓; (iv)pycnometer is used to measure density/specific gravity/volume, NOT stress-strain, so (iv)–(d) is the incorrect pairing.
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