If a thermometer reads 850oF, what is the equivalent temperature in oC?

Correct Answer: Option A — 454oC

The conversion formula from Fahrenheit to Celsius is C = (F - 32) × 5/9. Applying this to 850°F: (850 - 32) = 818. Then, 818 × 0.5556 equals approximately 454.4°C. This calculation is critical for interpreting high-temperature readings in exhaust gas systems or boiler superheat monitoring on board merchant vessels.