Subtopic: Human engineering and safety considerations in design of tractor and agricultural implements
Question Statement:
The range of frequency of vertical vibration of tractor most harmful to the operator's body at a root mean square acceleration of 1.0 m s⁻² in Hertz is
Options:
(A) 0.4 – 0.8
(B) 4.0 – 8.0
(C) 400 – 800
(D) 4000 – 8000
Official Answer Key:
B
Step-by-Step Solution & Explanation
Human whole-body vibration sensitivity (per ISO 2631 type frequency-weighting curves) peaks in the low-frequency range roughly 4–8 Hz, which coincides with the natural resonant frequency of the human trunk/abdominal organs in the vertical direction — vibration energy at these frequencies is transmitted most efficiently into the body and causes the greatest physiological discomfort/harm for a given RMS acceleration. This matches option (B), 4.0–8.0 Hz; the other ranges are orders of magnitude away from the known human resonance band.
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