Question Bank • QB_FP_173 MCQ • 1 Mark

Section 3: Farm Power

Farm Power

Subtopic: I.C. engine cycles

Question Statement:

According to ISO 2631 human vibration guidelines, the human body is most sensitive to whole-body vertical ($z$-axis) vibration in the frequency range of:

Options:

  • (A) $4\text{ to } 8\text{ Hz}$
  • (B) $20\text{ to } 35\text{ Hz}$
  • (C) $50\text{ to } 75\text{ Hz}$
  • (D) $100\text{ to } 150\text{ Hz}$

Answer Key:

A

Step-by-Step Solution & Explanation

The human spinal column and viscera exhibit primary mechanical resonance to vertical ($z$-axis) vibrations in the frequency band of $4 - 8\text{ Hz}$, which matches the typical ride vibrations of un-suspended tractors.
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