How would you expect a truck with a cargo tank that has baffles to handle on the road?

There will be less front-to-back surge than there is in a tanker without baffles.

The truck will seem heavier than it really is.

The truck will handle the same way as a tanker without baffles.

Most serious skids result from

loose material on the road surface.

Which of these statements about stopping distance and speed are true?

Wet roads can double the stopping distance at any speed.

You need about twice as much braking distance at 40 mph as at 20 mph.

To drive a tank vehicle that carries hazardous materials, you must have

both a hazardous materials (H) endorsement and a tank vehicle (N) endorsement.

a tank vehicle (N) endorsement.

a hazardous materials (H) endorsement.

Which of these statements is true about backing heavy vehicles?

You should avoid backing whenever you can.

Helpers should be out of sight and use only spoken signals to communicate with the driver.

It's safer to back toward the right side of the vehicle.

How often should you check the tires on a placarded trailer that has dual tires?

At the start of each trip and each time you stop

When loading the individual tanks of a tanker that is equipped with bulkheads, you should make sure that

there is an even distribution of weight.

most of the weight is toward the front of the vehicle.

the middle tank contains the largest amount of liquid.

You should know the outage needed for the liquids you carry because

some liquids expand more than others when they get warm.

some of the heaviest liquids do not need any outage.

tank baffles are not always legal with outage.

Before loading, unloading, or driving a tanker, what should you do first?

Make sure you have enough fuel.

Make sure you have all the required placards.

If you must make an emergency stop, brake so that

your vehicle will stay in a straight line.

you can use the parking brake before the brake pedal.

you'll definitely lock the brakes.

A full tank of a dense liquid

may exceed legal weight limits.

should only be carried in smooth bore tanks.

gives you more stability for going around turns.

Why must air tanks be drained?

Your brakes may fail because of water freezing.

Your transmission fluid may drain out.

Your left-side brake will cease to operate.

Which of these is true?

You should not load a cargo tank completely full.

Half-full cargo tanks are more stable than empty tanks.

All liquids expand by the same amount as they warm.

If you drive a tank vehicle that you know is leaking, you may

receive a citation and be prevented from further driving.

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20 questions
Pass mark 80%

Connecticut CDL: Tanker Vehicles Practice Test

20 tanker vehicles questions for the Connecticut CDL Knowledge Test, out of 96 in the app. Answer each to see whether you got it right and why. The real Connecticut Tanker Vehicles test has 20 questions and you need 16 correct (80%) to pass.

Facts updated Oct 26, 2026
Official source: law.cornell.edu
Independent, not affiliated with the DMV. How we write our questions

How it works

1Pick an answer20 questions, one tap each.
2See the ruleRight or wrong, every answer is explained.
3Get your scoreCompared with the real 80% pass mark.

Start the test

0/20 answered0 correctPass mark 80%

1Question 1 of 20
A vehicle placarded for hazardous materials must have placards on ______ sides.
Not quite. The answer is four
You placard your vehicle to warn everyone around you that you are transporting hazardous materials. Therefore, you must have placards on all four sides of your vehicle.
2Question 2 of 20
How would you expect a truck with a cargo tank that has baffles to handle on the road?
Not quite. The answer is There will be less front-to-back surge than there is in a tanker without baffles.
Baffled tanks have bulkheads with holes to reduce forward-and-backward surge. This will reduce the chance that forward surge will push your vehicle dangerously forward when you're slowing or stopping. However, these bulkheads don't significantly reduce side-to-side surge, so rollovers can still occur.
3Question 3 of 20
Most serious skids result from
Not quite. The answer is driving too fast.
Over-braking and over-steering can cause skids. Both over-braking and over-steering are more likely when you're driving too fast for the current road conditions.
4Question 4 of 20
Which of these statements about stopping distance and speed are true?
Not quite. The answer is Wet roads can double the stopping distance at any speed.
To control surge, know the stopping distance of your vehicle and brake far in advance of a stop whenever possible. Bear in mind that your vehicle's stopping distance on wet roads will be about double its stopping distance on dry roads.
5Question 5 of 20
Which of these is NOT included in the acronym "S.T.A.M.P.E.D." for hoses?
Not quite. The answer is Environment
The S.T.A.M.P.E.D. acronym is widely used to assist you in obtaining the correct hoses and fittings for your needs. S: the required size of the hose; T: the temperatures to which the hose will be subjected; A: the application (use) to which the hose will be put; M: the types of material (liquid, gas, etc.) that will have to flow through the hose; P: the maximum working pressure of the hose; E: the required fittings at the ends of the hose; D: the date at which the hose must be delivered to you.
6Question 6 of 20
To drive a tank vehicle that carries hazardous materials, you must have
Not quite. The answer is both a hazardous materials (H) endorsement and a tank vehicle (N) endorsement.
A tank vehicle (N) endorsement qualifies you to haul liquids or gases. However, if those liquids or gases are classified as hazardous materials, you must also have a hazardous materials (H) endorsement to haul them. To obtain each of these endorsements, you must pass a specialized knowledge test. Note: These days, if you obtain both endorsements, your CDL may include the combined endorsement code X (tank vehicle and HazMat) instead of both H and N.
7Question 7 of 20
Which of these statements is true about backing heavy vehicles?
Not quite. The answer is You should avoid backing whenever you can.
Backing up a large vehicle is always dangerous, even with a helper. Try to avoid backing up as much as possible.
8Question 8 of 20
You are driving on a clear night with your low beam headlights on. If your headlights let you see about 250 feet ahead of you, adjust your speed so that you can stop within about
Not quite. The answer is 250 feet.
You should always be able to stop within the distance you can see ahead. Fog, rain, or other conditions may require that you slow down to be able to stop in the distance you can see. If your headlights let you see only 250 feet ahead, adjust your speed so that you can stop within that distance. Otherwise, by the time you notice a hazard ahead, you may not be able to stop in time to avoid it.
9Question 9 of 20
How often should you check the tires on a placarded trailer that has dual tires?
Not quite. The answer is At the start of each trip and each time you stop
If you have a placarded trailer with dual tires, you should check the tires at the start of each trip and each time that you stop for any reason, whether to rest or to refuel. Use a tire pressure gauge to get an accurate reading.
10Question 10 of 20
When loading the individual tanks of a tanker that is equipped with bulkheads, you should make sure that
Not quite. The answer is there is an even distribution of weight.
Some liquid tanks are divided into several smaller tanks by bulkheads. When loading and unloading the smaller tanks, pay attention to weight distribution. Don’t put too much weight on the front or rear of the trailer.
11Question 11 of 20
You should know the outage needed for the liquids you carry because
Not quite. The answer is some liquids expand more than others when they get warm.
Different liquids expand at different rates as the temperature increases. In science, the percentage increase of expansion for a given change in temperature is called the coefficient of thermal expansion. This value depends on the type of liquid. You need to find out how much outage you will need to allow for the type of liquid you'll be hauling.
12Question 12 of 20
Before loading, unloading, or driving a tanker, what should you do first?
Not quite. The answer is Inspect the vehicle.
Before loading, unloading, or driving a tanker, you must inspect the vehicle. This makes sure that the vehicle is safe to carry liquids or gases and is safe to drive. Tank vehicles have special items that you need to check. Study the vehicle's operator manual to learn how to inspect your tank vehicle.
13Question 13 of 20
If you must make an emergency stop, brake so that
Not quite. The answer is your vehicle will stay in a straight line.
If you must brake in an emergency, brake in a way that keeps your vehicle in a straight line while still letting you turn if necessary. You can use the "controlled braking" method or (in a vehicle without antilock brakes) the "stab braking" method.
14Question 14 of 20
A full tank of a dense liquid
Not quite. The answer is may exceed legal weight limits.
A full tank of dense liquid (such as some acids) may exceed legal weight limits. For this reason, you may not be able to completely fill the tank with a dense liquid.
15Question 15 of 20
Why must air tanks be drained?
Not quite. The answer is Your brakes may fail because of water freezing.
Your air tanks hold a mixture of water and compressor oil. If left inside to collect at the bottom, the water may freeze and cause brake failure.
16Question 16 of 20
Which of these is true?
Not quite. The answer is You should not load a cargo tank completely full.
Some liquids expand significantly when they warm up. To fill a tank with such a liquid, you must leave some room in the tank (called "outage") to take the expansion. Different liquids expand at different rates as the temperature increases. In science, the percentage increase of expansion for a given change in temperature is called the coefficient of thermal expansion. This value depends on the type of liquid. You need to find out how much outage you will need to allow for the type of liquid you'll be hauling.
17Question 17 of 20
Which of these types of cargo tanks is commonly used to carry propane gas under pressure?
Not quite. The answer is MC-331
MC-331 cargo tanks carry gases that are liquefied under relatively high pressure (maximum allowable pressure of 100–500 psi). The cargo tank has a circular cross section and rounded ends. These tanks are commonly used to carry such gases as propane and liquefied petroleum gas (LPG).
18Question 18 of 20
The Maximum Allowable Working Pressure (MAWP) of a cargo tank is the maximum pressure that is allowed at _________ in normal operation.
Not quite. The answer is the top of the tank
In general, the Maximum Allowable Working Pressure (MAWP) of a pressurized tank is the maximum pressure that the weakest part of the tank can handle in normal operation. For a cargo tank on a motor vehicle, the federal definition of MAWP assumes that the weakest part is at the top of the tank.
Source: 49 CFR 178.320
19Question 19 of 20
When should the driver of a tanker that has lost its brakes use a truck escape ramp?
Not quite. The answer is Always
Escape ramps are designed with soft gravel, upgrades, or both, to slow down vehicles that experience brake failure on a downgrade. Regardless of the type of CMV you're driving, if your brakes have failed, head for one of these escape ramps, which can save lives, equipment, and cargo.
20Question 20 of 20
If you drive a tank vehicle that you know is leaking, you may
Not quite. The answer is receive a citation and be prevented from further driving.
It is illegal to knowingly carry liquids or gases in a leaking tank. If you do, you may receive a citation and be prevented from driving further.

Questions people ask

Is this Connecticut CDL: Tanker Vehicles Practice Test like the real Connecticut CDL Knowledge Test?

The questions are written in the same style as the real test, from official sources, with an explanation for each answer. The real test has 20 questions; this free test has 20.

How many questions are on the Connecticut CDL Knowledge Test?

The General Knowledge test has 20 questions. Each class and endorsement adds its own test.

What score do you need to pass the Connecticut CDL Knowledge Test?

You need 16 out of 20 correct (80%).

How old do you have to be to take the Connecticut CDL Knowledge Test?

You can take it from age 18.

Where can I practice more questions?

The Driving Exam Prep app has the full question bank for your test, a step-by-step roadmap, a mistakes review and a readiness score against the real pass mark.

Official sources

Our questions are written from these official sources. Always study your official handbook too: rules change, and our practice questions may differ from your real test.

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