Question 1

The Hazardous Materials Segregation Table is found in which section of the CFR?

Accepted Answer

The Segregation Table, which dictates which materials cannot be loaded, transported, or stored together, is located in 49 CFR § 177.848.

Question 2

In the Segregation Table, what does an 'X' at the intersection of two classes indicate?

Accepted Answer

An 'X' in the table indicates that the materials are incompatible and must NOT be loaded, transported, or stored together in the same transport vehicle.

Question 3

In the Segregation Table, what does the letter 'O' indicate?

Accepted Answer

An 'O' indicates that the materials may not be loaded together unless they are separated in a manner that, in the event of leakage from packages, commingling would not occur.

Question 4

Can you load Class 8 Corrosive liquids with Class 1.1 Explosives?

Accepted Answer

Class 1.1 Explosives are generally incompatible with most other classes, including Class 8 Corrosives. The table marks this with an 'X'.

Question 5

Which class must NOT be loaded with Division 6.1 (Poison) or 2.3 (Poison Gas)?

Accepted Answer

Poisons (6.1 and 2.3) must never be loaded with foodstuffs, animal feed, or edible materials intended for consumption by humans or animals.

Question 6

You are loading Cyanides or Cyanide mixtures (Division 6.1). You must NOT load them with:

Accepted Answer

Cyanides must never be loaded with Acids (Class 8). If they mix, they produce lethal Hydrogen Cyanide gas.

Question 7

Can Class 1.1 Explosives be loaded with Division 5.1 Oxidizers?

Accepted Answer

Class 1.1 Explosives and Division 5.1 Oxidizers are incompatible (X). Oxidizers can intensify the explosive reaction.

Question 8

When the segregation table indicates 'Separate' (O), how much separation is typically required if loaded on the same vehicle?

Accepted Answer

The 'Separate' requirement means physically separating the materials to prevent commingling. This can be done using non-hazmat freight as a buffer or ensuring enough space/blocking.

Question 9

Can you load Class 8 (Corrosive) liquids with Class 3 (Flammable) liquids?

Accepted Answer

Generally, Class 8 and Class 3 are compatible (Blank in the table), provided the corrosive is not Nitric Acid (which is an oxidizer) and the flammable liquid is not something that reacts specifically.

Question 10

Division 4.2 (Spontaneously Combustible) materials are prohibited from being loaded with:

Accepted Answer

Spontaneously Combustible materials (4.2) and Oxidizers (5.1) are incompatible (X). Oxidizers provide the oxygen that 4.2 materials need to burn fiercely.

Question 11

Are Division 6.1 (Poison) materials compatible with Class 3 (Flammable Liquids)?

Accepted Answer

Poisons and Flammable Liquids are generally compatible and can be loaded together (cell is blank).

Question 12

Which class requires separation from almost all other classes except for its own kind?

Accepted Answer

Division 1.1 and 1.2 Explosives have the most restrictive segregation rules and cannot be loaded with almost any other hazmat class.

Question 13

When loading Division 2.3 (Poison Gas, Zone A) and Division 2.1 (Flammable Gas), the table indicates:

Accepted Answer

Poison Gas (Zone A) and Flammable Gas are prohibited from being loaded together.

Question 14

If a segregation restriction applies, who is responsible for ensuring the load is segregated properly?

Accepted Answer

While the shipper offers the load, the carrier and the driver are responsible for loading and transporting it safely in compliance with segregation rules.

Question 15

What is the requirement for loading Class 8 (Corrosive) liquids with Division 4.1 (Flammable Solids)?

Accepted Answer

Generally, Class 8 liquids and Class 4.1 solids are compatible (Blank) unless specific chemical incompatibilities exist.

Question 16

Can you transport Division 1.5 (Blasting Agents) with Division 1.1 (Explosives)?

Accepted Answer

Explosives of different divisions can be transported together (Compatibility Group permitting), but the total load is generally treated as the most hazardous division (1.1).

Question 17

Nitric Acid (Class 8) is strictly prohibited from being loaded with:

Accepted Answer

Nitric Acid (Class 8) specifically cannot be loaded *above* any other material because if it leaks, it is an oxidizer and can cause fire/reaction with materials below.

Question 18

Batteries (wet, filled with acid) are Class 8. Can they be loaded with Class 3 Flammable Liquids?

Accepted Answer

Class 8 and Class 3 are generally compatible.

Question 19

You must never load a package labeled 'Poison' or 'Poison Inhalation Hazard' in the driver's cab or sleeper berth.

Accepted Answer

True. Hazardous materials must never be transported in the cab or sleeper berth of the vehicle.

Question 20

Class 5.2 (Organic Peroxides) and Class 3 (Flammable Liquids) interaction is:

Accepted Answer

Organic Peroxides (5.2) are oxidizers and thermally unstable. They should be 'Separated' (O) from Flammable Liquids (3).

Question 21

Which material requires separation from Division 4.2 (Spontaneously Combustible)?

Accepted Answer

Division 1.3 Explosives and Division 4.2 Spontaneously Combustible materials are incompatible (X).

Question 22

Can you load Class 4.3 (Dangerous When Wet) with Class 8 (Corrosive Liquids)?

Accepted Answer

Generally, 4.3 and 8 are compatible (Blank), provided the corrosive liquid is not water-based or leaking, but the table itself marks the intersection as Blank.

Question 23

Compatibility Group letters (A, B, C, D...) are used for segregating:

Accepted Answer

Compatibility letters are used specifically to determine if different types of Class 1 explosives can be loaded together.

Question 24

If a hazardous material package is leaking, you must:

Accepted Answer

Leaking packages must not be accepted for transport or loaded.

Question 25

Which hazard class is generally considered 'compatible' with most other classes (fewest restrictions)?

Accepted Answer

Class 9 (Miscellaneous) has the fewest segregation restrictions.

Question 26

Charged storage batteries (Class 8) should be loaded:

Accepted Answer

Batteries must be loaded upright and secured to prevent short circuits, which could cause a fire.

Question 27

Can Division 6.1 (Poison) be loaded with foodstuffs if the poison is in the form of a 'Limited Quantity'?

Accepted Answer

Even limited quantities of poisons should typically not be loaded with foodstuffs, though specific exceptions exist for ORM-D. However, the general rule for CDL exams is Poisons + Food = No.

Question 28

Class 7 Radioactive Yellow-II and Yellow-III packages must be separated from:

Accepted Answer

Radioactive materials (Yellow-II/III) require separation distances from people and live animals to minimize radiation exposure.

Question 29

You are loading Class 2.1 (Flammable Gas) and Class 3 (Flammable Liquid). The table indicates:

Accepted Answer

Flammable Gases and Flammable Liquids are compatible (Blank).

Question 30

Which of the following combinations requires separation (O)?

Accepted Answer

Oxidizers (5.1) and Corrosive Liquids (8) generally require separation (O) to prevent reactions.

Question 31

Division 4.1 (Flammable Solid) and Division 5.1 (Oxidizer) are:

Accepted Answer

Flammable Solids and Oxidizers must be separated (O) to prevent intense fire hazards.

Question 32

What is the rule for loading Class 8 (Corrosive) liquids near Class 1 explosives?

Accepted Answer

Corrosive liquids and Explosives (1.1, 1.2, 1.3, 1.5) are incompatible (X).

Question 33

If a separation distance is required, what can be used to achieve it?

Accepted Answer

Non-hazardous freight (pallets of goods) acts as a physical buffer to prevent commingling in the event of a leak.

Question 34

Are Division 2.2 (Non-Flammable Gas) and Class 3 (Flammable Liquid) compatible?

Accepted Answer

Yes, Non-Flammable Gas and Flammable Liquids are compatible.

Question 35

You have a load of Class 3 Flammable Liquids. Can you load Division 1.5 Blasting Agents with it?

Accepted Answer

Explosives (even 1.5) are prohibited (X) from being loaded with Flammable Liquids.

Question 36

Compressed Gas Cylinders must be:

Accepted Answer

Cylinders must be securely restrained in an upright or horizontal position (depending on design) to prevent movement.

Question 37

Can you load Class 8 Corrosives next to Class 4.1 Flammable Solids?

Accepted Answer

Generally compatible (Blank).

Question 38

The segregation table applies to:

Accepted Answer

The table specifically regulates segregation on transport vehicles (trucks/trailers).

Question 39

Which class is incompatible with Division 5.2 Organic Peroxides?

Accepted Answer

Division 2.3 (Poison Gas, Zone A) is generally incompatible with most reactive materials like Organic Peroxides (O or X).

Question 40

If a material is described as 'Corrosive Liquid, Acidic', it must be separated from:

Accepted Answer

Acids and Bases (Alkalis) react violently. Even though both are Class 8, they must be separated or prohibited from mixing (often handled by packaging rules, but conceptually segregated).

Hazmat Segregation Practice Questions

More CDL Hazmat Endorsement Exam Topics