Subtopic: Human engineering and safety considerations in design of tractor and agricultural implements
Question Statement:
According to international occupational safety standards (OSHA / ISO), the permissible continuous acoustic noise exposure limit at the tractor operator station for an un-protected 8-hour workday is:
Options:
(A) $85 - 90\text{ dB(A)}$
(B) $115 - 120\text{ dB(A)}$
(C) $40 - 45\text{ dB(A)}$
(D) $140\text{ dB(A)}$
Answer Key:
A
Step-by-Step Solution & Explanation
OSHA Standard 1910.95 and ISO occupational safety directives set the action level for an 8-hour Time-Weighted Average (TWA) noise exposure at 85 dB(A) and the maximum permissible exposure limit at 90 dB(A) before mandatory hearing protection is enforced.