You are driving a tanker truck. The front wheels begin to skid. Which of these is most likely to occur?

You will continue in a straight line and keep moving forward no matter how you steer.

Liquid surge will pull the tank from the truck.

allowance for expansion of liquid.

how fast the liquid tanks drain.

To correct a drive-wheel braking skid, you should

stop braking, turn quickly, and countersteer.

brake harder, turn quickly, and countersteer.

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.

When should you inspect a tank vehicle?

Before loading it, driving it, or unloading it

Before loading it or driving it

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.

Tankers that are used to transport liquid food products

can have strong forward-and-backward surge.

are not affected by side-to-side surge.

can affect the handling of your vehicle.

should never occur in a tank that is properly loaded.

is only a problem when you're driving on a slippery road.

If you do not have an automatic tank drain, when should you drain your air tanks?

After every four hours of service

Most serious skids result from

loose material on the road surface.

If you need to steer your tanker quickly to avoid a hazard, you

should avoid braking as you're turning.

will find your tanker relatively easy to countersteer.

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Mississippi CDL: Tanker Vehicles Practice Test

20 tanker vehicles questions for the Mississippi CDL Knowledge Test, out of 96 in the app. Answer each to see whether you got it right and why. The real Mississippi 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

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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
You are driving a tanker truck. The front wheels begin to skid. Which of these is most likely to occur?
Not quite. The answer is You will continue in a straight line and keep moving forward no matter how you steer.
In a front-wheel skid, the front end of your vehicle tends to travel in a straight line regardless of how you turn the steering wheel. This type of skid is most often caused by driving too fast for the current driving conditions. Therefore, the best way to recover from this type of skid is to just let the vehicle slow down. Steer and brake only gently.
2Question 2 of 20
A DOT-406 cargo tank (e.g., in a fuel-delivery truck) has a maximum allowable working pressure (MAWP) of
Not quite. The answer is 4 psi.
One of the most common types of cargo tanks is the DOT-406, typically used for fuel delivery. A semi-truck with a DOT-406 mounted to the semitrailer is commonly called a "gasoline truck." DOT-406 tanks have a low maximum allowable working pressure (MAWP) of 4 psi.
3Question 3 of 20
Which of these types of cargo tanks is commonly used to carry gasoline?
Not quite. The answer is MC-306 (DOT-406)
MC-306 (DOT-406) cargo tanks carry liquids under very low or no pressure (maximum allowable pressure of 3 psi for MC-306 and 4 psi for DOT-406). The cargo tank has an oval or elliptical cross section and is usually compartmented. These tanks are commonly used to carry gasoline, diesel fuel or fuel oil, and other flammable liquids.
4Question 4 of 20
Outage means
Not quite. The answer is allowance for expansion of liquid.
When liquid heats up, it expands, and outage is the space in the tank that is allocated to handle the expansion. Different types of liquids expand by different amounts. Therefore, the amount of outage you will need depends on the type of liquid.
5Question 5 of 20
To correct a drive-wheel braking skid, you should
Not quite. The answer is stop braking, turn quickly, and countersteer.
To recover from a drive-wheel braking skid, first stop braking. The rear wheels will unlock and roll again so there will be no more tendency to slide sideways. Then quickly steer your vehicle back on course. You may find that your vehicle will overshoot and keep on turning, possibly skidding in the opposite direction. Countersteer to counteract this. Note: This maneuver takes some practice. You should become proficient in it before you actually need to use it.
6Question 6 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.
7Question 7 of 20
The best way to take a curve in a tanker is to slow to a safe speed before entering the curve and then _________ as you go through it.
Not quite. The answer is speed up slightly
The posted speed for a curve may be safe for cars but not for tankers because of their relatively high center of gravity. Tests have shown that a tanker can roll over on a curve when traveling at the posted speed. The safest way to take a curve in a tanker is to slow down before the curve and then accelerate slightly through the curve.
8Question 8 of 20
A smooth bore tank is also known as
Not quite. The answer is an unbaffled tank.
A smooth bore tank is another name for an unbaffled tank. Without baffles, there is likely to be strong forward-and-backward surge. Nevertheless, certain cargoes such as milk and other liquid food products must be transported in smooth bore, unbaffled tanks. Sanitation regulations forbid the use of baffles because they are hard to keep sufficiently clean.
9Question 9 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.
10Question 10 of 20
If you steer quickly while braking, your tanker may
Not quite. The answer is roll over.
Baffled tanks can control back-and-forth surge but not side-to-side surge. During sudden steering changes, side-to-side surge can cause your tanker to roll over. Avoid such sudden moves when possible.
11Question 11 of 20
The movement of the liquid in partially filled tanks is called
Not quite. The answer is surging.
When a tank is not completely filled, the liquid has room to move around. It can slosh back and forth or side to side. This is called surging.
12Question 12 of 20
When should you inspect a tank vehicle?
Not quite. The answer is Before loading it, driving it, or unloading it
You should inspect a tank vehicle before loading it, driving it, or unloading it. This is to ensure that it is safe to carry out these activities and the vehicle can safely hold its liquid or gas contents.
13Question 13 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.
14Question 14 of 20
Baffles in liquid cargo tanks do NOT usually prevent
Not quite. The answer is side-to-side surge.
Some tanks have baffles: bulkheads with holes through which the liquid can flow forward or backward. These baffles significantly reduce forward-and-backward surge but not side-to-side surge, so the risk of surge causing a rollover remains.
15Question 15 of 20
Tankers that are used to transport liquid food products
Not quite. The answer is can have strong forward-and-backward surge.
Baffles are often used in tanks to reduce forward-and-backward surge. Nevertheless, certain cargoes, such as milk and other liquid food products, must be transported in smooth bore, unbaffled tanks. (Sanitation regulations forbid the use of baffles because they are hard to keep sufficiently clean.) These tanks are liable to have very strong forward-and-backward surge. Be very careful when driving vehicles with such tanks.
16Question 16 of 20
Liquid surge
Not quite. The answer is can affect the handling of your vehicle.
Liquid surge can greatly affect your vehicle's handling. Surge can push the vehicle in the same direction as the surge. This can be especially hazardous on icy roads, where a truck may be pushed forward a dangerous amount, maybe past a red light into an intersection. On curves, side-to-side surge can cause a rollover even when traction is good.
17Question 17 of 20
If you do not have an automatic tank drain, when should you drain your air tanks?
Not quite. The answer is At the end of each working day
Oil and water can start to collect in the bottom of an air tank and can cause brake failure if it's not drained. Unless your vehicle automatically drains the air tanks, you should drain them at the end of each working day so the moisture and oil will not freeze or coagulate and cause your brakes to fail.
18Question 18 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.
19Question 19 of 20
If you need to steer your tanker quickly to avoid a hazard, you
Not quite. The answer is should avoid braking as you're turning.
The liquid cargo can surge both back and forth and side to side. This makes a skid more likely if you brake in a sharp turn. And it also makes it more likely that the skid will lead to a rollover.
20Question 20 of 20
The most common type of foundation brake found on vehicles with air brakes is the
Not quite. The answer is S-cam drum brake.
Foundation brakes are present on each wheel. In North America as of this writing, S-cam drum brakes are much more common than wedge or disc brakes.

Questions people ask

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

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

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

You can take it from age 18.

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You are driving a tanker truck. The front wheels begin to skid. Which of these is most likely to occur?

A DOT-406 cargo tank (e.g., in a fuel-delivery truck) has a maximum allowable working pressure (MAWP) of

Which of these types of cargo tanks is commonly used to carry gasoline?

Outage means

To correct a drive-wheel braking skid, you should

Which of these is NOT included in the acronym "S.T.A.M.P.E.D." for hoses?

The best way to take a curve in a tanker is to slow to a safe speed before entering the curve and then _________ as you go through it.

A smooth bore tank is also known as

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

If you steer quickly while braking, your tanker may

The movement of the liquid in partially filled tanks is called