CDL · Hazardous materials
Which three hazard classes are generally kept out of any cargo compartment that has a heater or a heater/air conditioner unit?
Correct answer: Classes 1, 2.1, and 3.
Answer options
- AClasses 2.2, 8, and 9
- BClasses 1, 2.1, and 3 Correct
- CClasses 6, 7, and 8
Why
A heater in the cargo area can ignite Class 1 explosives, Division 2.1 flammable gases, and Class 3 flammable liquids. For that reason the regulations usually forbid heaters in the compartment holding such loads, even automatic units that provide both heating and air conditioning. Don't load them in that kind of space unless you are aware of all the related rules.
About this question
Topic: Hazardous materials License: CDL
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Where it applies: Asked in every state.
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This question is part of Loading and Unloading HazMat (32 questions). Take the full set and check your score.
Practice Loading and Unloading HazMatMore questions from Loading and Unloading HazMat
- Besides explosives and oxidizers, which kind of cargo makes it illegal for anyone to smoke within 25 feet of the vehicle?
- Which kind of hazardous material may have a "transport index" on its package, telling carriers how much control the shipment needs in transit?
- For which hazard class does a transport index limit how much may be loaded onto a single vehicle?
- You are about to load or unload explosives. When you inspect the cargo space, which of these should you look for?
- Is it permitted to transport nitric acid, a Class 8 material, together with other hazmat cargo on one vehicle?
- A trailer's cargo space is fitted with a heater or an air-conditioning unit. Which hazard classes may never be loaded into it?
- What rule applies when you load or unload packages of explosives?
- Which loading rule applies to nitric acid?
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