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CDL Tanker practice questions

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Question 1Tank vehicle fundamentals and endorsement applicability

A commercial motor vehicle has a single permanently mounted tank with a rated capacity of 1,200 gallons. What endorsement is required to drive it?

  1. A tank vehicle (N) endorsement Correct answer.
  2. A hazardous materials (H) endorsement only
  3. A passenger (P) endorsement
  4. No special endorsement, because the tank is empty

Explanation

A tank vehicle endorsement is required for a commercial motor vehicle designed to carry liquid or gas in a tank with an individual capacity over 119 gallons and an aggregate capacity of 1,000 gallons or more. A 1,200-gallon tank meets that threshold. An H endorsement is additional and applies only when placarded hazardous materials are involved.

Question 2Tank vehicle fundamentals and endorsement applicability

A truck carries two temporarily attached tanks designed for liquid: one rated at 100 gallons and one rated at 950 gallons. Does the driver need an N endorsement?

  1. No, because temporarily attached tanks never require the endorsement.
  2. Yes, because the combined total of all tanks is 1,050 gallons.
  3. No, because the qualifying total is 950 gallons. Correct answer.
  4. Yes, because any tank over 100 gallons requires the endorsement.

Explanation

The tank vehicle definition counts tanks with an individual rated capacity over 119 gallons and requires the qualifying tanks to total 1,000 gallons or more. The 100-gallon tank does not meet the individual threshold, so only the 950-gallon tank counts. The qualifying total is therefore below 1,000 gallons, and no N endorsement is required for this configuration.

Question 3Tank vehicle fundamentals and endorsement applicability

A commercial motor vehicle carries a permanently mounted tank filled with dry cement powder. The tank has a rated capacity of 1,500 gallons. Which statement is correct?

  1. An H endorsement is required because cement is hazardous.
  2. An N endorsement is not required for dry bulk. Correct answer.
  3. An X endorsement is required because the tank is large.
  4. An N endorsement is required because the tank exceeds 1,000 gallons.

Explanation

The tank vehicle definition covers tanks used to transport liquid or gaseous materials. Dry bulk powder such as cement is not a liquid or gas, so the N endorsement does not apply solely because of tank size. An H endorsement applies to placarded hazardous materials, and an X endorsement combines tank vehicle and hazardous materials authority.

Question 4Tank vehicle fundamentals and endorsement applicability

A driver hauls an empty 1,500-gallon storage container that is not designed for transportation, temporarily secured to a flatbed trailer. Is an N endorsement required?

  1. No, because it is not designed for transportation. Correct answer.
  2. Yes, because any tank on a flatbed is a tank vehicle.
  3. Yes, because the container exceeds 1,000 gallons.
  4. No, because the container is empty.

Explanation

There is an exception for an empty storage container that is not designed for transportation and is temporarily attached to a flatbed trailer. Such a container is not considered a tank vehicle for CDL endorsement purposes. The key fact is the container's design purpose, not merely its capacity or whether it currently holds cargo.

Question 5Tank vehicle fundamentals and endorsement applicability

After unloading, a tank vehicle is empty but still has its cargo tank attached. Does the driver need the N endorsement to drive it?

  1. Yes, the vehicle is still a tank vehicle by design. Correct answer.
  2. Only if the tank is more than half full.
  3. Only if hazardous materials placards are displayed.
  4. No, because there is no liquid in the tank.

Explanation

The tank vehicle endorsement is based on the vehicle's design and tank capacity, not on whether cargo is currently aboard. An empty tank vehicle remains a tank vehicle and still requires the N endorsement. Placards relate to hazardous materials authority, not to the basic tank vehicle endorsement.

Question 6Tank vehicle fundamentals and endorsement applicability

A driver with an N endorsement is assigned to haul a tank load of gasoline that requires placards. What else is required?

  1. Nothing, the N endorsement covers all tank loads.
  2. An H endorsement in addition to N. Correct answer.
  3. A T endorsement in addition to N.
  4. A P endorsement in addition to N.

Explanation

The N endorsement authorizes operation of a tank vehicle, but placarded hazardous materials also require hazardous materials authority. The driver therefore needs an H endorsement in addition to N. A P endorsement is for passengers, and a T endorsement is for double or triple trailers.

Question 7Tank vehicle fundamentals and endorsement applicability

Which endorsement combination is represented by an X endorsement on a CDL?

  1. Passenger and school bus
  2. Tank vehicle and hazardous materials Correct answer.
  3. Double/triple trailers and tank vehicle
  4. Hazardous materials and passenger

Explanation

An X endorsement reflects the combination of tank vehicle and hazardous materials authority. It is used when a driver has both the N and H qualifications. Passenger, school bus, and double/triple trailer endorsements are separate and are not represented by X.

Question 8Tank vehicle fundamentals and endorsement applicability

What is liquid surge in a tank vehicle?

  1. The buildup of static electricity during loading.
  2. Liquid moving inside the tank as the vehicle moves. Correct answer.
  3. The expansion of liquid when the tank is overfilled.
  4. The leakage of liquid from a faulty valve.

Explanation

Surge is the movement of liquid within the tank as the vehicle accelerates, brakes, or turns. That movement shifts weight and can affect steering, braking, and rollover risk. Expansion, static electricity, and leakage are separate concerns.

Question 9Tank vehicle fundamentals and endorsement applicability

What is the purpose of baffles in a tank?

  1. To allow the tank to be filled completely without outage.
  2. To increase the tank's carrying capacity.
  3. To reduce forward and backward surge. Correct answer.
  4. To keep the liquid at a constant temperature.

Explanation

Baffles are partitions with openings that slow the movement of liquid inside the tank. They reduce forward and backward surge but do not eliminate it. Baffles do not increase rated capacity, control temperature, or remove the need for outage space.

Question 10Tank vehicle fundamentals and endorsement applicability

A tanker has a smooth-bore tank with no baffles and is partially loaded. What driving adjustment is most important?

  1. Drive at the same speed as a baffled tank.
  2. Reduce speed and make smooth, gradual movements. Correct answer.
  3. Fill the tank completely to stop the liquid from moving.
  4. Increase following distance only on wet roads.

Explanation

An unbaffled tank allows more liquid movement, and a partial load can shift forcefully. The driver should slow down and avoid abrupt braking or steering. Filling the tank completely is not always possible, and following distance should be increased in general, not only on wet roads.

Question 11Tank vehicle fundamentals and endorsement applicability

Why is side-to-side liquid surge especially dangerous in a tank vehicle?

  1. It shifts weight outward and increases rollover risk. Correct answer.
  2. It causes the brakes to overheat.
  3. It reduces the tank's rated capacity.
  4. It makes the cargo tank detach from the chassis.

Explanation

Side-to-side surge occurs during turns or evasive maneuvers and shifts the load's weight toward the outside of the turn. Because tank vehicles already have a high center of gravity, this increases the risk of rollover. Surge does not change the tank's rated capacity, overheat the brakes, or detach the tank.

Question 12Tank vehicle fundamentals and endorsement applicability

How does forward liquid surge affect stopping a tank vehicle?

  1. It can push the vehicle forward, so you need to brake earlier. Correct answer.
  2. It shortens stopping distance by adding weight to the front tires.
  3. It reduces brake temperature.
  4. It has no effect if the tank is baffled.

Explanation

When the vehicle brakes, liquid moves forward and can add force that pushes the vehicle ahead. The driver should brake early and smoothly to allow for this effect. Baffles reduce surge but do not remove it, and the weight shift does not simply improve stopping or cool the brakes.

Question 13Tank vehicle fundamentals and endorsement applicability

What is the recommended way to handle a curve in a tank vehicle?

  1. Brake firmly while in the curve to keep the liquid settled.
  2. Slow before the curve, then accelerate gently. Correct answer.
  3. Accelerate through the curve to keep the liquid at the back.
  4. Maintain highway speed because the tank is baffled.

Explanation

The driver should reduce speed before entering the curve to limit side-to-side surge and rollover risk. After the curve, acceleration should be gentle so the liquid does not shift abruptly. Firm braking inside the curve or accelerating through it can worsen load movement.

Question 14Tank vehicle fundamentals and endorsement applicability

On a long downgrade, what should a tank vehicle driver do?

  1. Use a lower gear and engine braking. Correct answer.
  2. Use a higher gear and rely on the brakes.
  3. Coast in neutral to save fuel.
  4. Apply the brakes continuously to control surge.

Explanation

A lower gear and engine braking help control speed on a long downgrade and reduce the risk of brake fade. Coasting in neutral is dangerous because it reduces control. Continuous braking can overheat the brakes, and a higher gear gives less engine braking.

Question 15Tank vehicle fundamentals and endorsement applicability

What does outage mean for a cargo tank?

  1. The amount of cargo currently loaded.
  2. A leak in the tank's piping.
  3. A shutdown of the tank's emergency valve.
  4. Space left for liquid expansion. Correct answer.

Explanation

Outage is the empty space intentionally left in a tank to allow liquid to expand as it warms. It is often expressed as a percentage of the tank's capacity. Outage is not a leak, the amount of cargo loaded, or an emergency valve shutdown.

Question 16Tank vehicle fundamentals and endorsement applicability

Why must a tank not be filled completely with liquid?

  1. A full tank prevents the baffles from working.
  2. Liquid expands when warm, so the tank needs space. Correct answer.
  3. A full tank makes the vehicle too light for the brakes.
  4. A full tank increases static electricity.

Explanation

Liquids expand as temperature rises, and outage provides room for that expansion. Filling completely can lead to overflow, tank damage, or a hazardous release. A full tank does not make the vehicle too light, and baffles still function when the tank is full.

Question 17Tank vehicle fundamentals and endorsement applicability

Before loading a flammable liquid into a tank vehicle, what should you do?

  1. Fill from the top to mix the product.
  2. Open the manhole cover and leave it open during loading.
  3. Ground and bond the tank to the source. Correct answer.
  4. Keep the engine running for the pump.

Explanation

Grounding the tank vehicle and bonding it to the loading source helps drain static electricity safely. Top loading or splash loading can generate additional static, and the engine should generally be shut off during loading. Leaving the manhole open during loading is not a safe practice.

Question 18Tank vehicle fundamentals and endorsement applicability

Why is splash loading a flammable liquid discouraged?

  1. It prevents the outage from being measured.
  2. It cools the liquid too quickly.
  3. It generates static electricity that can ignite vapors. Correct answer.
  4. It makes the tank too heavy at the front.

Explanation

Splash loading, such as filling from the top, can generate static electricity and disturb vapors. That creates an ignition risk with flammable liquids. Bottom loading is generally preferred to reduce static generation.

Question 19Tank vehicle fundamentals and endorsement applicability

Before moving a tank vehicle after loading, what should you confirm?

  1. The emergency shutoff is disabled.
  2. All valves and hatches are closed and secured. Correct answer.
  3. The manhole covers are open.
  4. The tank is filled to the top.

Explanation

All valves and hatches must be closed and secured before the vehicle moves to prevent leaks or spills. The emergency shutoff should remain functional, not be disabled. The tank should not be filled to the top because outage space is required.

Question 20Tank vehicle fundamentals and endorsement applicability

What information does a cargo tank's specification plate provide?

  1. The tank's design and intended service. Correct answer.
  2. The current price of the cargo.
  3. The driver's endorsement expiry date.
  4. The route the vehicle must follow.

Explanation

The specification plate identifies the tank's design specifications, capacity, materials, and intended service. Drivers use it to confirm that the tank is suitable for the product being carried. It does not show driver licensing, cargo price, or routing information.

Question 21Tank vehicle fundamentals and endorsement applicability

Where should you check for an emergency shutoff device on a tank vehicle?

  1. Under the passenger seat.
  2. At the loading or unloading controls. Correct answer.
  3. On the front bumper.
  4. Only inside the driver's cab.

Explanation

Emergency shutoff devices are located at loading and unloading controls so the operator can quickly stop the flow of product. They must be accessible at the point where loading or unloading occurs. The other listed locations are not the standard place to look for this device.

Question 22Tank vehicle fundamentals and endorsement applicability

Compare surge in a partially filled unbaffled tank with a nearly full unbaffled tank. Which is generally true?

  1. A partially filled tank has no surge because the liquid is shallow.
  2. Surge is the same regardless of fill level.
  3. A nearly full tank has more free space and therefore more surge.
  4. A partial load can produce stronger surge. Correct answer.

Explanation

A partial load leaves more free space, allowing liquid to move farther and build momentum inside an unbaffled tank. A nearly full tank has less free surface and generally less surge. Surge varies with fill level, and even a shallow load can move.

Question 23Tank vehicle fundamentals and endorsement applicability

A tank is equipped with baffles. What should the driver assume?

  1. Surge is completely eliminated, so normal driving speed is safe.
  2. Baffles increase side-to-side surge in curves.
  3. Surge is reduced but still present. Correct answer.
  4. Baffles only work when the tank is empty.

Explanation

Baffles reduce liquid movement but do not eliminate surge. Drivers must still slow down, brake early, and steer smoothly. Baffles work when liquid is present and are designed to reduce, not increase, surge.

Question 24Tank vehicle fundamentals and endorsement applicability

What is required to add an N endorsement to a CDL?

  1. A knowledge test covering tank vehicle operation. Correct answer.
  2. A medical waiver from the tank manufacturer.
  3. A written test only, with no CDL skills test ever.
  4. A separate driving skills test in a tank vehicle only.

Explanation

The N endorsement requires a knowledge test covering tank vehicle operation and safety. The CDL skills test is a separate requirement for the CDL itself and is conducted in a representative vehicle. A tank manufacturer does not issue medical waivers for endorsements.

Question 25Tank vehicle fundamentals and endorsement applicability

Does the tank vehicle definition include tanks carrying gaseous materials?

  1. Only if the gas is flammable.
  2. No, it covers only liquids.
  3. Only if the tank is baffled.
  4. Yes, it covers liquids and gases. Correct answer.

Explanation

The tank vehicle definition covers tanks used to transport liquid or gaseous materials. Flammability is not the deciding factor for the N endorsement. Baffles affect surge control and are not part of the endorsement applicability test.

Question 26Tank vehicle fundamentals and endorsement applicability

Under federal CDL rules, a vehicle is a tank vehicle when each tank has a rated capacity of more than 119 gallons and the tanks together have an aggregate rated capacity of at least:

  1. 1,500 gallons
  2. 1,000 gallons Correct answer.
  3. 750 gallons
  4. 500 gallons

Explanation

The federal definition of a tank vehicle requires each tank to have a rated capacity of more than 119 gallons and the tanks together to total 1,000 gallons or more, whether permanently or temporarily attached to the vehicle or chassis. A load that falls below these figures is outside the definition and does not require the N endorsement.

Question 27Tank vehicle fundamentals and endorsement applicability

Which CDL endorsement is required to operate a tank vehicle?

  1. T
  2. H
  3. N Correct answer.
  4. X

Explanation

The N endorsement is the tank vehicle endorsement and covers operation of vehicles that meet the tank vehicle definition. H covers hazardous materials, X combines the tank and hazardous materials endorsements, and T covers double and triple trailers.

Question 28Tank vehicle fundamentals and endorsement applicability

A driver operates a truck with two permanently mounted tanks, each rated at 600 gallons, used to haul liquid fertilizer. What do federal CDL rules require?

  1. Only an H endorsement, since the cargo is a liquid.
  2. An N endorsement, since the tanks total over 1,000 gallons. Correct answer.
  3. An X endorsement, since two tanks are mounted on one truck.
  4. No endorsement, since each individual tank is under 1,000 gallons.

Explanation

The definition looks at the combined rated capacity of the tanks attached to the vehicle. Here the tanks total 1,200 gallons, above the 1,000-gallon threshold, and each tank is over 119 gallons, so the vehicle is a tank vehicle requiring the N endorsement.

Question 29Tank vehicle fundamentals and endorsement applicability

Why does a loaded tank vehicle roll over more easily than a comparably sized dry van?

  1. Its cargo shifts only when the truck is stopped.
  2. Its brakes are less effective when the load is liquid.
  3. Its liquid load raises the center of gravity and shifts sideways in turns. Correct answer.
  4. Its tires carry less weight per axle.

Explanation

Liquid sits above the tank floor and moves freely, so the loaded center of gravity is higher than in a comparable dry van and shifts toward the outside of a turn. That weight transfer makes rollover more likely, which is why tank vehicle drivers slow down before entering curves.

Question 30Tank vehicle fundamentals and endorsement applicability

A flatbed trailer is carrying an empty 1,500-gallon storage container that was not designed for transportation and is temporarily secured to the deck. How do federal CDL rules treat this vehicle?

  1. It is not a tank vehicle, so no N endorsement is needed. Correct answer.
  2. It is a tank vehicle because the container exceeds 1,000 gallons.
  3. It is a tank vehicle only while the container is empty.
  4. It requires an X endorsement because the container held liquid in the past.

Explanation

Federal rules exclude from the tank vehicle definition a vehicle transporting an empty storage container tank, not designed for transportation, with a rated capacity of 1,000 gallons or more that is temporarily attached to a flatbed trailer. Because the vehicle is not a tank vehicle, the N endorsement is not required to move it.

Question 31Inspecting tank vehicles (pre-trip, tank, hoses, and fittings)

Baffles inside a cargo tank are designed to:

  1. slow the forward and backward surge of the liquid Correct answer.
  2. increase the legal carrying capacity of the tank
  3. keep the product from freezing in cold weather
  4. separate the tank into compartments that are loaded separately

Explanation

Baffles are bulkheads with holes in them, and their purpose is to slow the movement of liquid so the vehicle is not pushed around by surge. They have openings, so they do not seal the tank into separate compartments.

Question 32Inspecting tank vehicles (pre-trip, tank, hoses, and fittings)

A cargo tank that has no baffles inside is known as a:

  1. pressure tank
  2. compartmented tank
  3. insulated tank
  4. smooth bore tank Correct answer.

Explanation

In a smooth bore tank the liquid is free to run from one end of the tank to the other, which makes surge much stronger. A tank divided by bulkheads is the opposite of a smooth bore tank.

Question 33Inspecting tank vehicles (pre-trip, tank, hoses, and fittings)

During the pre-trip inspection of a tank vehicle, the dome cover (hatch) should be:

  1. closed, latched, and fitted with a sound gasket Correct answer.
  2. left slightly open so air can escape
  3. covered with a plastic sheet to keep rain out
  4. removed so the tank interior can be seen during the trip

Explanation

The hatch must seal tightly so liquid and vapor stay in the tank. A cracked or missing gasket, or a cover that is not latched, allows product to escape.

Question 34Inspecting tank vehicles (pre-trip, tank, hoses, and fittings)

Why must the vents on a cargo tank be open and working before you drive?

  1. They let air in and out as the liquid level changes Correct answer.
  2. They keep rain water from collecting on top of the tank
  3. They allow the tank to be filled faster at the terminal
  4. They let the driver see the liquid level inside the tank

Explanation

As product is loaded, unloaded, or expands with temperature, air must move in or out of the tank. A clogged vent can let pressure or vacuum build up, which may damage the tank or force product past seals.

Question 35Inspecting tank vehicles (pre-trip, tank, hoses, and fittings)

Which of these is something you check when inspecting a liquid cargo hose?

  1. the date the hose was manufactured
  2. the color of the hose's outer jacket
  3. the overall length of the hose in feet
  4. cuts, cracks, soft spots, and bulges Correct answer.

Explanation

A hose is inspected for conditions that could lead to a rupture, such as cuts, cracks, bulges, soft spots, and worn areas. The couplings and gaskets at each end are checked at the same time.

Question 36Inspecting tank vehicles (pre-trip, tank, hoses, and fittings)

A worn or missing gasket in a hose coupling will most likely cause:

  1. a leak at the connection when the hose is under pressure Correct answer.
  2. the hose to become too stiff to coil
  3. the hose to be too short to reach the fill pipe
  4. the tank's vent to become clogged

Explanation

The gasket is what seals the joint between the coupling halves. If it is worn, cracked, or missing, product can escape at the connection once the hose is pressurized.

Question 37Inspecting tank vehicles (pre-trip, tank, hoses, and fittings)

The specification (test date) plate on a cargo tank tells you:

  1. the maximum Gross Vehicle Weight allowed for the truck
  2. the maximum speed the tank vehicle may be driven
  3. the name of the shipper who last loaded the tank
  4. when the tank was last tested and whether retesting is due Correct answer.

Explanation

Cargo tanks must be inspected and pressure tested on a schedule, and the plate records those dates. If the test is out of date, the tank should not be put into service.

Question 38Inspecting tank vehicles (pre-trip, tank, hoses, and fittings)

Before you move a tank vehicle, the discharge valves and emergency valves should be:

  1. open whenever the tank is empty
  2. closed and secured Correct answer.
  3. open so pressure can escape
  4. left in the same position they were in during unloading

Explanation

Valves left open can release product while the vehicle is moving, creating a spill and a fire hazard. They must be closed and the handles secured before the vehicle moves.

Question 39Inspecting tank vehicles (pre-trip, tank, hoses, and fittings)

Some tank vehicles have a remote (emergency) shutoff control. During the inspection you should:

  1. keep the control locked in the closed position at all times
  2. disconnect the control before loading the tank
  3. make sure the control is accessible and works Correct answer.
  4. check the control only after the vehicle is loaded and moving

Explanation

The emergency control must be reachable and able to stop the flow quickly if a leak or spill occurs. A control that is stuck, locked, or out of reach is a defect that must be corrected.

Question 40Inspecting tank vehicles (pre-trip, tank, hoses, and fittings)

When checking how the tank is attached to the truck frame, you should look for:

  1. the size of the bolts used at the factory
  2. loose, cracked, or missing mounting brackets and bolts Correct answer.
  3. whether the tank shell is painted the color shown in the manual
  4. the number of straps on the hose rack

Explanation

The tank must be held firmly to the frame, so the mounting brackets, bolts, and their fasteners are checked for looseness, cracks, and missing parts. A loose tank can shift or break free.

Question 41Inspecting tank vehicles (pre-trip, tank, hoses, and fittings)

Grounding and bonding cables on a tank vehicle used for flammable liquids should be checked for:

  1. being long enough to reach from the cab to the terminal office
  2. being coiled neatly on the catwalk
  3. corrosion, broken strands, and a solid connection Correct answer.
  4. the correct color coding on the insulation

Explanation

The grounding path must be electrically sound, so the cable is checked for corrosion, broken strands, and firm connections at both ends. A damaged ground path can allow static to spark.

Question 42Inspecting tank vehicles (pre-trip, tank, hoses, and fittings)

While inspecting the outside of the tank shell, you should pay particular attention to:

  1. the position of the vent handles on the catwalk
  2. the air pressure in the truck's tires
  3. seams, rivets, and welds for cracks or leaks Correct answer.
  4. the shine of the metal on the tank shell

Explanation

Leaks most often start where the tank is joined, so seams, rivets, welds, and the shell itself are checked for cracks, dents, and wet or stained spots. Tire pressure is checked separately.

Question 43Inspecting tank vehicles (pre-trip, tank, hoses, and fittings)

As part of the tank vehicle inspection, the fire extinguisher must be:

  1. discharged and refilled after each trip
  2. fully charged and securely mounted Correct answer.
  3. kept inside one of the cargo tank compartments
  4. stored loose in the cab under the seat

Explanation

The extinguisher must be charged and mounted so it is ready to use and will not roll around or become a projectile. It also has to be within easy reach of the driver.

Question 44Inspecting tank vehicles (pre-trip, tank, hoses, and fittings)

When you inspect the piping, valves, and fittings under the tank, you are mainly looking for:

  1. the total number of valves installed
  2. leaks, loose connections, and damaged parts Correct answer.
  3. the diameter of the pipes in inches
  4. the color of the valve handles

Explanation

Piping and fittings must carry product without releasing it, so the check focuses on leaks, loose joints, and damaged or missing parts. A loose connection can spill product onto the road.

Question 45Inspecting tank vehicles (pre-trip, tank, hoses, and fittings)

When you look inside a tank through the dome opening, you should make sure the baffles are:

  1. coated with the product being loaded
  2. in place and not cracked or broken Correct answer.
  3. filled with water to add weight
  4. removed so the tank can be cleaned more easily

Explanation

A cracked or broken baffle can come loose inside the tank and damage it or jam the load. The baffles are checked for damage before the tank is loaded.

Question 46Inspecting tank vehicles (pre-trip, tank, hoses, and fittings)

A tank that is divided into compartments by bulkheads:

  1. must be filled to the top before the valves are closed
  2. is always a smooth bore tank
  3. can carry a different product in each compartment Correct answer.
  4. cannot be used to haul flammable liquids

Explanation

Sealed bulkheads separate the tank into compartments, and each has its own valves and piping. That lets the vehicle carry more than one product, or split a load by weight.

Question 47Inspecting tank vehicles (pre-trip, tank, hoses, and fittings)

When you check the placards on a loaded tank vehicle, you should confirm that they:

  1. match the product actually in the tank Correct answer.
  2. are removed before the vehicle leaves the terminal
  3. are stored in the cab until the tank is full
  4. are the same on every tank vehicle regardless of cargo

Explanation

Placards tell emergency responders and others what hazard is on board, so they must reflect the cargo actually being carried and be displayed where required.

Question 48Inspecting tank vehicles (pre-trip, tank, hoses, and fittings)

During a pre-trip you find the tank has been filled right up to the dome cover with no outage left. Why is this a problem?

  1. The vents can then be left closed during the trip
  2. The driver cannot see the liquid level from the catwalk
  3. There is no room for the liquid to expand as it warms Correct answer.
  4. The weight shifts too far onto the front axle

Explanation

Liquids expand as they warm, so a small space must be left above the surface. With no outage, expanding product can overflow or build pressure inside the tank.

Question 49Inspecting tank vehicles (pre-trip, tank, hoses, and fittings)

After you finish using a liquid cargo hose, you should:

  1. drain it, cap it, and stow it properly Correct answer.
  2. coil it on the ground beside the truck
  3. leave it connected to the tank so it is ready next time
  4. hang it from the valves by the coupling

Explanation

A hose left connected or lying around can be dragged, run over, or torn, and any product left in it can spill. Draining, capping, and stowing it protects both the hose and the environment.

Question 50Inspecting tank vehicles (pre-trip, tank, hoses, and fittings)

During a pre-trip, you find a deep crack in a hose coupling. The correct action is to:

  1. remove the hose from service and report it Correct answer.
  2. use the hose only for short trips
  3. shorten the hose to remove the cracked section
  4. wrap the coupling with tape and continue

Explanation

A cracked coupling can fail under pressure and release product, so the hose cannot be used until it is properly repaired or replaced. Defects like this are reported and the hose is taken out of service.