CDL Hazmat Endorsement Practice Test 2026：第3套练习测试

CDL Hazmat Endorsement Practice Test 练习测试第3套（共4套）：再练25道题，附答案和解释。

商用车辆
美国
90道题
核对于2026年10月10日

第1题，共25题
When loading or unloading explosives or flammable liquids, what should you do with the engine?
- Run it to keep the cab warm
- Leave it running at a high idle
- Turn it off unless it runs a pump
- Start it every few minutes
显示答案
答案: C. Turn it off unless it runs a pump
Turn off the engine when loading or unloading explosives or flammable liquids, unless you need it to run a pump.
第2题，共25题
What is the rule about cargo heaters when you carry explosives, flammable liquids or flammable gases?
- They are required in winter
- They are allowed if the load is small
- They are generally not allowed
- They must be on high
显示答案
答案: C. They are generally not allowed
Cargo heaters are generally banned for explosives, flammable liquids and flammable gases.
第3题，共25题
What kind of cargo space must you use for explosives, flammable solids and oxidizers?
- Any space, as long as the load is tied
- An open flatbed with the load hanging over
- A closed space, with no overhanging load
- The driver's cab, where you can watch it
显示答案
答案: C. A closed space, with no overhanging load
These materials must be in a closed cargo space. Overhanging or tailgate loads are not allowed.
第4题，共25题
What kind of floor lining is required when loading explosives?
- No lining is ever needed
- A wet rubber mat
- A steel plate
- A lining with no steel or iron
显示答案
答案: D. A lining with no steel or iron
Floor linings for explosives must not contain steel or iron, which can make sparks.
第5题，共25题
How must you handle explosives packages?
- Throw them gently onto the trailer
- Stack them as high as possible
- Never drop, throw or roll them
- Slide them on sharp edges
显示答案
答案: C. Never drop, throw or roll them
Handle explosives carefully. Keep them away from sharp points and never drop, throw or roll them.
第6题，共25题
Which combination may NOT carry Division 1.1 or 1.2 explosives?
- A van with closed doors
- A tractor with one semitrailer
- A triples combination
- A single straight truck
显示答案
答案: C. A triples combination
Division 1.1 or 1.2 explosives may not be carried in a triples combination.
第7题，共25题
For radioactive materials, what is the most total transport index allowed on one vehicle?
- 500
- 100
- 50
- 10
显示答案
答案: C. 50
The total transport index of all radioactive packages on one vehicle must not be more than 50.
第8题，共25题
Where must packages labeled POISON never be carried?
- In the cab or sleeper, or with food
- On a pallet with other freight
- In a closed, locked trailer
- At the front of the trailer
显示答案
答案: A. In the cab or sleeper, or with food
Never carry poison packages in the cab or sleeper, or in the same vehicle with foodstuffs.
第9题，共25题
Where may nitric acid be loaded?
- Anywhere in the trailer
- Not above any other product
- Only on top of other products
- Only in the cab
显示答案
答案: B. Not above any other product
Never load nitric acid above any other product.
第10题，共25题
Which materials may not be loaded or stored with acids?
- Paper
- Cyanides
- Cotton
- Sand
显示答案
答案: B. Cyanides
Cyanides must not be loaded or stored with acids.
第11题，共25题
How should you load glass carboys of corrosive liquid?
- Upright, one at a time
- On their sides, stacked high
- Several at once by dropping them in
- Upside down
显示答案
答案: A. Upright, one at a time
Load corrosive carboys by hand, one by one, keeping them upright.
第12题，共25题
A hazmat package is leaking at the dock. What should you do?
- Put it in the cab to watch it
- Load it at the back of the trailer
- Do not accept or transport it
- Tape it and drive
显示答案
答案: C. Do not accept or transport it
Never transport leaking packages. Refuse them.
第13题，共25题
On the segregation table, what does an X mean for two hazard classes?
- They may not be loaded together
- They may be loaded together
- They must ride in the cab
- They need extra placards
显示答案
答案: A. They may not be loaded together
An X means the materials may not be loaded on the same vehicle. An O means they must be separated so they cannot mix.
第14题，共25题
A placarded vehicle comes to a railroad crossing. Where must it stop?
- It does not need to stop at all
- 15 to 50 feet from the nearest rail
- Right at the edge of the first rail
- At least 100 feet from the tracks
显示答案
答案: B. 15 to 50 feet from the nearest rail
Placarded vehicles and certain hazmat cargo tanks must stop within 50 feet of, and not closer than 15 feet to, the tracks.
第15题，共25题
What must you never do while driving across railroad tracks with a hazmat load?
- Shift gears
- Look both ways
- Use a low gear
- Keep moving
显示答案
答案: A. Shift gears
Do not shift gears while crossing the tracks.
第16题，共25题
When must a vehicle with Division 1.1, 1.2 or 1.3 explosives be attended?
- Only when parked longer than one hour
- Only on public roads
- At all times
- Only at night
显示答案
答案: C. At all times
A vehicle carrying these explosives must be attended at all times by the driver or another qualified person.
第17题，共25题
Under the attendance rule, when is a hazmat vehicle attended?
- When the engine is running and the flashers are on, even if no one is near
- When you are awake in it (not in the sleeper) or within 100 feet with a clear view
- When the doors are locked and the alarm is set, even if you are inside a store
- When someone from the company is within 1 mile and can be reached by phone
显示答案
答案: B. When you are awake in it (not in the sleeper) or within 100 feet with a clear view
Attended means you are awake in the vehicle and not in the sleeper berth, or within 100 feet with the vehicle in clear view.
第18题，共25题
How close to the traveled part of a road may you park a vehicle with Division 1.1, 1.2 or 1.3 explosives?
- Right on the road edge
- No closer than 5 feet
- 10 feet only at night
- No closer than 1 mile
显示答案
答案: B. No closer than 5 feet
Do not park explosives vehicles on or within 5 feet of the traveled part of a road.
第19题，共25题
Except for brief stops, how far must a vehicle with Division 1.1, 1.2 or 1.3 explosives park from bridges, tunnels and buildings?
- At least 300 feet
- At least 100 feet
- At least 1,000 feet
- At least 25 feet
显示答案
答案: A. At least 300 feet
These vehicles may not park within 300 feet of a bridge, tunnel, dwelling or place where people work or gather, except briefly.
第20题，共25题
How close to an open fire may a placarded hazmat vehicle park?
- No closer than 25 feet
- There is no rule
- No closer than 50 feet
- No closer than 300 feet
显示答案
答案: D. No closer than 300 feet
Do not park a hazmat vehicle within 300 feet of an open fire.
第21题，共25题
While fueling a hazmat vehicle, what must happen?
- The driver waits inside the store
- Engine off, and someone at the nozzle
- Engine running, to keep power on
- The tank is filled right to the top
显示答案
答案: B. Engine off, and someone at the nozzle
Turn off the engine, and a person must control the fueling at the point where the tank is filled.
第22题，共25题
When must you check the tires on a hazmat vehicle?
- Only when a tire looks low or flat
- Only at the end of each trip
- At the start of each trip and each time you park
- Once a week, at the company yard
显示答案
答案: C. At the start of each trip and each time you park
Inspect each tire at the beginning of each trip and each time the vehicle is parked.
第23题，共25题
You find an overheated tire on a hazmat vehicle. What must you do?
- Let some air out and keep on driving
- Remove it and move it a safe distance away
- Drive faster so air flow cools it
- Spray it with water and keep driving
显示答案
答案: B. Remove it and move it a safe distance away
An overheated tire must be removed right away and placed a safe distance away. Fix the cause before driving.
第24题，共25题
A tire on your hazmat vehicle is flat. What may you do?
- Drive at normal speed until it overheats
- Let air out of the other tires
- Drive to your destination
- Drive only to the nearest safe place to fix it
显示答案
答案: D. Drive only to the nearest safe place to fix it
A flat or leaking tire must be fixed before driving, but you may drive to the nearest safe place to repair it.
第25题，共25题
What size fire extinguisher must a placarded vehicle carry?
- One rated 1 A or more
- One rated 2 B:C or more
- One rated 10 B:C or more
- Any size at all
显示答案
答案: C. One rated 10 B:C or more
Power units of placarded vehicles must have a fire extinguisher rated 10 B:C or more.

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