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CETP Pre-Certification Review Exam Questions and Answers with Rationale Latest Updated 2026/2027

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CETP Pre-Certification Review Exam Questions and Answers with Rationale Latest Updated 2026/2027 Domain 1: Basic Principles and Propane Characteristics Q1. What is the approximate specific gravity of propane vapor compared to air?       A) 0.50 B) 1.00 C) 1.50 D) 2.00 Correct Answer: C Rationale: Propane vapor is about 1.5 times heavier than air. (Specific gravity of air is 1.00). This means propane vapor will tend to settle in low-lying areas, such as basements or ditches, if a leak occurs. Q2. Why is an odorant added to propane, and what is the most common odorant used?       A) To make propane burn hotter; Ethyl Mercaptan. B) To detect leaks; Ethyl Mercaptan. C) To make propane more stable; Butane. D) To change propane from a liquid to a gas; Methane. Correct Answer: B Rationale: Propane is naturally odorless. A distinct odorant, typically Ethyl Mercaptan, is added so that leaks can be detected by smell before they reach dangerous concentrations.

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