Question 62 ONC05 - Master or Mate of LT 200 GRT

The Correct Answer is C. **Explanation for Option C (C):** Option C is correct because, according to standard US Coast Guard regulations (46 CFR Subchapter D) defining grades of flammable liquid bulk cargoes, **Grade C** is defined as any flammable liquid having a flash point of 80°F or below (27°C) and a Reid vapor pressure (RVP) of **8.5 P.S.I. or less**. Since the liquid in the question meets both the RVP limit (exactly 8½ P.S.I.) and the flash point requirement (80°F or below), it is classified as Grade C. **Explanation for Other Options:** * **A) A:** Grade A liquids are defined as having a flash point of 80°F or below and a Reid vapor pressure **greater than 14 P.S.I.** The liquid described has an RVP of 8½ P.S.I., which is too low for Grade A. * **B) B:** Grade B liquids are defined as having a flash point of 80°F or below and a Reid vapor pressure **greater than 8.5 P.S.I. but not exceeding 14 P.S.I.** The liquid described has an RVP of exactly 8½ P.S.I., placing it at the boundary point for Grade C, not Grade B. * **D) D:** Grade D liquids are considered **combustible** liquids, defined as having a flash point **greater than 80°F** but not exceeding 150°F. The liquid in the question has a flash point of 80°F or below, classifying it as flammable, not combustible (Grade D or E).