CDL Tanker Endorsement — All Questions

What is 'liquid surge' in a tank vehicle?

• a.The foaming of liquid caused by rough road surfaces
• b.The leakage of liquid past a faulty valve
• c.The wave action of liquid that moves back and forth when the vehicle changes speed✓
• d.The buildup of vapor pressure inside a sealed tank

Liquid surge is the movement of liquid in partially filled tanks. When the driver brakes, the liquid surges forward and can push the truck ahead, then rock it backward. This wave action can strongly affect vehicle handling and control.

Why are unbaffled (smooth bore) tanks often used to haul food products such as milk?

• a.They eliminate liquid surge entirely
• b.Sanitation regulations make it difficult to clean the inside of baffles✓
• c.They hold more product than baffled tanks
• d.They are cheaper to manufacture than baffled tanks

Unbaffled liquid tankers, often called smooth bore tanks, have nothing inside to slow the flow of liquid. They are frequently used to transport food products like milk because sanitation rules would make it very hard to clean baffles thoroughly. As a result, drivers must be especially alert to strong surge.

What are baffles inside a tank designed to do?

• a.Keep the liquid from freezing
• b.Control the forward and backward surge of the liquid✓
• c.Increase the total capacity of the tank
• d.Prevent side-to-side surge in curves

Baffled tanks have bulkheads with holes that let liquid flow through them. The baffles help control forward-to-back liquid surge when starting and stopping. They do little to control side-to-side surge, which remains a concern in turns and lane changes.

Side-to-side surge in a tank is most dangerous because it can cause which of the following?

• a.A rollover✓
• b.Vapor lock in the engine
• c.The cargo to overheat
• d.Excessive fuel consumption

Side-to-side surge is the liquid moving toward one side of the tank and then the other, such as during lane changes or curves. Because tank vehicles have a high center of gravity, this surge can create enough force to tip the vehicle over. Rollovers are a leading cause of tanker crashes.

What does 'outage' refer to when loading a liquid tank?

• a.A pump failure during loading
• b.The total weight of the cargo
• c.A leak detected at the dome cover
• d.The empty space left in the tank so liquid can expand✓

Outage is the space you must leave in a tank because liquids expand as they warm up. Different liquids expand by different amounts and therefore require different amounts of outage. You must never load a tank totally full or the expanding liquid could rupture the tank.

Why must some tanks be only partially filled based on the liquid's weight?

• a.To reduce the risk of the cargo freezing
• b.Because dense liquids evaporate quickly
• c.To make the vehicle easier to steer at high speeds
• d.Because a full load of a dense liquid could exceed legal weight limits✓

The amount of liquid you can load depends on how much it will expand, the weight of the liquid, and legal weight limits. A dense (heavy) liquid may bring the vehicle over its legal weight before the tank is even full. You may only be able to fill part of the tank with a heavy liquid.

How does a tank vehicle's high center of gravity affect driving?

• a.It lowers the risk of rollover
• b.It makes the vehicle more likely to roll over✓
• c.It has no effect on a loaded tank
• d.It improves braking on wet roads

Tank vehicles have a high center of gravity, meaning much of the weight is carried high off the road. This makes the vehicle top-heavy and easy to roll over. Liquid surge combined with a high center of gravity makes tankers especially prone to tipping in curves and sudden maneuvers.

What is the danger of hauling a partially loaded tank compared to a full one?

• a.Partial loads always weigh more than full loads
• b.There is no difference in handling
• c.Liquid surge is greater, making the vehicle harder to control✓
• d.Partial loads cannot legally cross state lines

With a partially filled tank, the liquid has room to move and create surge. This surge can affect braking, acceleration, and turning, and may even shove the vehicle in the direction the liquid is moving. A full tank has far less room for the liquid to surge.

Which type of tank has nothing inside to slow the movement of the liquid?

• a.Compartmented tank with bulkheads
• b.Smooth bore (unbaffled) tank✓
• c.Baffled tank
• d.Insulated cargo tank

Smooth bore or unbaffled tanks have no bulkheads or baffles inside. Nothing slows the liquid, so surge is strong and immediate. Drivers of smooth bore tanks must be extremely cautious, especially when starting and stopping.

When a driver of a smooth bore tanker comes to a stop, what can the forward surge of liquid do?

• a.Lift the front wheels off the road
• b.Push the vehicle forward after the driver has stopped✓
• c.Cause the tank to leak at the seams
• d.Automatically apply the parking brake

In a smooth bore tank, the liquid surges forward when braking and can push a stopped vehicle out into an intersection. Drivers must allow extra stopping distance and remain alert to this push. This is one reason smooth bore tanks require special driving skill.

Compared to solid cargo of the same weight, why does bulk liquid raise rollover risk?

• a.Liquid tanks are always taller than dry vans
• b.Liquid weighs more per gallon than solid cargo
• c.The liquid lowers the vehicle's center of gravity
• d.The liquid can shift and surge, moving weight and adding force in turns✓

Unlike a fixed solid load, bulk liquid moves inside the tank. This shifting weight and surge adds sideways force during turns and lane changes. Combined with the high center of gravity of tankers, it makes rollover a serious and constant hazard.

How do baffled tanks handle side-to-side liquid movement?

• a.They increase side-to-side surge
• b.They convert side surge into forward surge
• c.They completely stop all side-to-side movement
• d.They do little to control side-to-side surge✓

Baffles have holes oriented to slow forward and backward surge. They do little or nothing to reduce side-to-side surge because the liquid can still move laterally around them. Drivers must still be cautious in curves and lane changes even with a baffled tank.

Three factors determine how much liquid you can safely load into a tank. Which set is correct?

• a.Trailer length, hitch rating, and fuel level
• b.The amount the liquid will expand, the liquid's weight, and legal weight limits✓
• c.Road grade, tire pressure, and axle count
• d.Ambient temperature, engine size, and brake type

You must consider how much the liquid will expand in transit, the weight of the liquid, and the legal weight limits. A dense liquid may reach the weight limit before the tank is full. Outage must be left for expansion regardless of how heavy the product is.

What happens to most liquids as their temperature rises during transport?

• a.They expand and take up more space✓
• b.They turn to vapor and escape
• c.They become denser and take up less space
• d.They lose weight through evaporation

Liquids expand as they warm. That is why tanks require outage, the empty space that lets the liquid grow without over-pressurizing or rupturing the tank. The warmer the loading and travel conditions, the more expansion room may be needed.

A tank divided into several separate compartments by bulkheads is used to do what?

• a.Eliminate the need to check axle weights
• b.Increase liquid surge for faster unloading
• c.Carry different products or help distribute weight across the vehicle✓
• d.Allow the tank to be loaded completely full

Compartmented tanks have bulkheads that create separate sections, which can carry different liquids or the same liquid loaded to balance weight. When loading and unloading, drivers must pay attention to how weight is distributed among compartments. Improper distribution can overload an axle or make the vehicle unstable.

When loading a compartmented tank, why must the driver check the weight distribution?

• a.To ensure the liquid stays at a constant temperature
• b.So no individual axle is overloaded and the vehicle stays balanced✓
• c.To prevent the baffles from cracking
• d.To reduce vapor pressure inside the tank

Loading too much weight in the front or rear compartments can overload an axle or make the vehicle unstable and hard to handle. The driver should distribute the load so axle weights are legal and the vehicle balances properly. Uneven loading also worsens surge effects.

Which combination of hazards makes tank vehicles especially unstable?

• a.Full tanks plus low speed
• b.High center of gravity plus liquid surge✓
• c.Low center of gravity plus heavy weight
• d.Baffles plus large outage

Tank vehicles combine a high center of gravity with the surging movement of liquid cargo. Together these make the vehicle unstable and prone to rollover, especially in curves, ramps, and quick lane changes. Drivers must slow down and steer smoothly to manage both hazards.

Why might you be unable to fill a cargo tank completely even when it is under the weight limit?

• a.Full tanks are illegal in all states
• b.The baffles block the top of the tank
• c.The pump cannot reach the top of the tank
• d.You must leave outage space for the liquid to expand✓

Even if weight is not the limiting factor, you must leave outage so the liquid has room to expand as it warms. Loading a tank totally full leaves no room for expansion and can rupture it. The required outage depends on the specific liquid being hauled.

On a smooth bore tanker, when is liquid surge typically the strongest?

• a.When the parking brake is set
• b.When starting and stopping, because nothing slows the forward-back movement✓
• c.When driving at a steady speed on a straight road
• d.Only when the tank is completely full

Smooth bore tanks have no baffles, so the liquid surges freely forward and back when speed changes. Starting and stopping produce the strongest surge in these tanks. This is why smooth bore tanks demand smooth, gradual speed changes and extra following distance.

How can the weight of a dense liquid limit how much you load?

• a.It lowers the center of gravity below safe levels
• b.You may reach the legal weight limit before the tank is full✓
• c.It requires the tank to be loaded completely full
• d.It causes the liquid to expand faster than the tank allows

A dense or heavy liquid adds a lot of weight per gallon. You may hit the legal gross or axle weight limit long before the tank is physically full. In that case you can only partially fill the tank, which also increases surge.

Which statement about baffled tanks is TRUE?

• a.They reduce forward-and-back surge but not side-to-side surge✓
• b.They are required for hauling milk and food products
• c.They completely prevent all liquid surge
• d.They increase forward and backward surge

Baffles have holes that slow the forward and backward flow of liquid, reducing that surge. However, they do little to control side-to-side surge in curves and lane changes. Drivers of baffled tanks must still be cautious of lateral movement and rollover.

What should a driver do when hauling a partially filled tank to manage surge?

• a.Brake hard and late to overcome the surge
• b.Accelerate quickly to keep the liquid pushed back
• c.Fill the remaining space with air pressure
• d.Anticipate surge and drive smoothly, allowing extra space✓

With a partial load, the driver should anticipate the surge that comes with every speed and direction change. Smooth braking, gentle acceleration, and extra following distance help keep the surging liquid from taking control of the vehicle. Abrupt maneuvers make surge worse and can cause loss of control.

Bulkheads with holes in them that let liquid flow through are called what?

• a.Outage vents
• b.Baffles✓
• c.Manifolds
• d.Domes

Baffles are bulkheads inside a tank that have holes to let liquid flow through while slowing its movement. They help control forward and backward surge. Tanks without them are called smooth bore or unbaffled tanks.

Why is understanding liquid density important before loading a tank?

• a.Density determines the color of the required placard
• b.A denser liquid weighs more, so you may load less to stay within weight limits✓
• c.Denser liquids do not surge inside the tank
• d.Denser liquids require less outage than light liquids

Density tells you how much a given volume of the liquid weighs. A high-density liquid reaches legal weight limits with less volume, so you can only load part of the tank. Failing to account for density can leave you overweight or unbalanced.

When inspecting a tank vehicle, why is checking for leaks especially important?

• a.Because leaking cargo can be hazardous and signals a serious defect✓
• b.Because tank inspections are optional for food products
• c.Because tanks never need weight checks
• d.Because leaks are only a problem after unloading

Tank vehicles have special inspection needs, and checking for leaks is one of the most important. A leak may indicate a defect that could be dangerous, especially with hazardous cargo. Any leaking tank should be taken out of service until repaired.

During a tank vehicle inspection, what should you check on the manhole (dome) covers?

• a.That the covers are welded permanently shut
• b.That the covers and gaskets seal properly and are not leaking✓
• c.That the covers can be opened while driving
• d.That the covers are painted the correct color

You must inspect the manhole or dome covers and their gaskets to make sure they seal tightly and do not leak. Vents and covers must close properly so the cargo stays contained. A leaking or loose cover is a defect that must be corrected before driving.

Why is it important to inspect vents on a tank vehicle?

• a.Vents replace the need for a pressure relief valve
• b.Vents are only used to fill the tank faster
• c.Vents must work properly so the tank does not collapse or build dangerous pressure✓
• d.Vents control the color of the placards

Many tanks have vents that must operate correctly to keep pressure balanced. If a vent is clogged or stuck, the tank could build up pressure or form a vacuum and collapse. Checking that vents are clear and functional is part of a proper tank inspection.

What special equipment should you check on a tank vehicle during inspection?

• a.The cargo temperature gauge in the cab only
• b.Only the radio and mirrors
• c.Special-purpose equipment such as vapor recovery kits, hoses, and connections if the vehicle has them✓
• d.The paint on the outside of the tank

Tank vehicles may carry special equipment such as hoses, pumps, connections, and vapor recovery gear depending on the cargo. You must make sure any such equipment is present, in good condition, and properly stored. Missing or damaged equipment can make loading and unloading unsafe.

Because tank vehicles are often heavy, what should you pay extra attention to during inspection?

• a.Tires, wheels, and the braking system, since heavy loads stress them✓
• b.The radio antenna
• c.The color of the cab
• d.The number of cup holders

Tank vehicles carry heavy loads that place extra stress on tires, wheels, and brakes. You should inspect tires for proper inflation and condition and check the braking system carefully. Worn or underinflated components are more likely to fail under a heavy tank load.

What should you do if you find a leak during a pre-trip inspection of a tanker?

• a.Drive slowly to the nearest customer
• b.Do not drive the vehicle until the leak is repaired✓
• c.Cover it with tape and continue
• d.Ignore it if the cargo is non-hazardous

A leaking tank is a serious defect and may be hazardous, especially with dangerous cargo. You must not operate a leaking tank vehicle until the leak is properly repaired. Continuing to drive risks cargo loss, contamination, and possible fire or environmental damage.

When inspecting the piping, hoses, and connections on a tank, what are you looking for?

• a.The correct shade of paint
• b.Leaks, damage, and loose or missing fittings✓
• c.Whether they can be removed while driving
• d.The manufacturer's logo

Piping, hoses, and connections must be checked for leaks, cracks, wear, and secure fittings. Loose or damaged connections can leak cargo during transport or unloading. All valves and caps should be properly closed and secured before the trip.

Emergency equipment such as fire extinguishers and warning devices should be checked during a tanker inspection because:

• a.Tank cargo can be flammable or hazardous, so emergency gear must be present and working✓
• b.They are only required for buses
• c.They are used to open the dome covers
• d.They add weight to balance the load

Many tank cargoes are flammable or otherwise hazardous, so functioning emergency equipment is essential. You must verify that fire extinguishers, warning triangles, and other required emergency gear are present and in working order. Missing emergency equipment can be a serious violation and a safety risk.

Why should you inspect the tank's mounting and the frame or supports?

• a.To ensure the tank is securely attached and supports are not cracked or loose✓
• b.To measure the tank's capacity
• c.To check the fuel economy rating
• d.To confirm the tank matches the truck's color

The tank must be firmly mounted to the vehicle with sound supports and hardware. Cracked, loose, or corroded mounting can allow the tank to shift or separate, which is extremely dangerous with a heavy liquid load. Inspecting the mounting is a key part of a tank vehicle check.

If your tank vehicle requires hazardous materials placards, when should you confirm they are correct and in place?

• a.Only if a police officer asks
• b.Placards are never needed on tanks
• c.Before the trip, as part of your inspection✓
• d.Only after delivery

If you haul a hazardous material that requires placards, you must display the correct placards on all four sides. Checking that the proper placards are present, clean, and undamaged is part of your pre-trip inspection. Missing or wrong placards are both a safety hazard and a legal violation.

What should you check about the tank's valves during inspection?

• a.That they can be operated from the cab while driving
• b.That they open and close properly and are not leaking✓
• c.That they are painted red
• d.That they are removed before travel

Intake, discharge, and cutoff valves must work correctly and seal without leaking. Before driving, all manual valves should be in the proper position and secured. Leaking or stuck valves can cause cargo loss during transport and must be repaired.

During inspection, why should you check that all tank openings are closed and secured?

• a.To improve the vehicle's fuel mileage
• b.To prevent cargo from spilling or surging out during transport✓
• c.To make the tank easier to paint
• d.To keep the tank warm

Open or unsecured hatches, valves, and caps can allow cargo to spill or splash out while driving. Securing all openings keeps the cargo contained and reduces the risk of leaks and contamination. This check is essential before every trip with a loaded tank.

Because a loaded tank places heavy stress on the suspension, what should you inspect?

• a.Springs, air bags, and other suspension components for damage or wear✓
• b.The windshield wipers only
• c.The company logo decals
• d.The cab's interior lights

Heavy tank loads stress the suspension, so you should inspect springs, air suspension bags, hangers, and related parts. Cracked or worn suspension components can fail under load and cause loss of control. A thorough suspension check is especially important on heavy tank vehicles.

What is a good reason to walk completely around the tank vehicle during inspection?

• a.To spot leaks, damage, and loose equipment on all sides of the tank✓
• b.To admire the paint job
• c.To warm up before driving
• d.To count the number of wheels for the log

Walking all the way around the vehicle lets you spot leaks, dents, loose fittings, and damaged equipment that you cannot see from one side. Tank vehicles have valves, hoses, and covers on multiple sides that all need checking. A full walk-around helps ensure nothing dangerous is missed.

When should the pre-trip inspection of a tank vehicle be completed?

• a.Only after the first hour of driving
• b.Before starting the trip, so defects are found before driving✓
• c.Once per month regardless of trips
• d.Only when the tank is empty

A thorough pre-trip inspection must be done before you start driving so that leaks, worn parts, and other defects are caught early. Finding a problem before the trip prevents breakdowns and dangerous failures on the road. Tank vehicles especially require this careful check because of their hazardous and heavy loads.

Why is checking tire inflation especially important on a loaded tanker?

• a.Heavy loads and heat can cause underinflated tires to fail✓
• b.Overinflated tires make the tank lighter
• c.Tires do not matter on tank vehicles
• d.Tire pressure changes the tank's capacity

A heavy tank load and the heat of travel put great stress on tires. Underinflated or damaged tires are far more likely to fail under this stress, which can cause a blowout and loss of control. Checking tire pressure and condition is a critical part of the tanker inspection.

What should you verify about the gaskets and seals around tank openings?

• a.That they are the correct brand name
• b.That they can be removed by hand while driving
• c.That they are in good condition and seal tightly without leaking✓
• d.That they glow in the dark

Gaskets and seals must be intact and seal tightly so the cargo stays contained. Cracked, dried out, or missing gaskets can allow leaks around covers and fittings. Replacing worn seals before a trip prevents cargo loss and contamination.

Inspecting the coupling system on a tank trailer is important because:

• a.It changes the color of the placards
• b.It has nothing to do with safety
• c.It sets the cargo temperature
• d.A failed coupling could allow a heavy loaded tank to separate from the tractor✓

The coupling system, including the fifth wheel and kingpin, must be secure and undamaged. With the heavy weight of a loaded tank, a coupling failure could let the trailer break away with catastrophic results. Carefully checking the coupling is essential before pulling a tank trailer.

What is the main reason tank vehicles roll over more easily than other trucks?

• a.Their extra-wide tires
• b.Their high center of gravity combined with liquid surge✓
• c.Their low ground clearance
• d.Their light overall weight

Tank vehicles carry weight high off the ground and the liquid inside can surge and shift. This high center of gravity plus surging cargo makes them easy to tip in curves and sudden maneuvers. Driving slowly and smoothly is the best defense against rollover.

How should you take curves and on-ramps in a loaded tank vehicle?

• a.At the posted speed limit for cars
• b.Well below the posted speed, slowing down before entering the curve✓
• c.At the same speed as an empty truck
• d.At maximum speed to get through quickly

Because of the high center of gravity and liquid surge, you should slow down well below posted curve and ramp speeds. Posted speeds are often set for cars and are too fast for a top-heavy tanker. Slow down before the curve so you are not braking hard while turning.

Why should tank vehicle drivers increase their following distance?

• a.Because tanks are not allowed to use the brakes
• b.Because liquid cargo makes the horn quieter
• c.Because tanks accelerate faster than other vehicles
• d.Because the vehicle is heavy and surge lengthens stopping ability✓

A loaded tank is heavy and the liquid surge can push the vehicle forward when braking, both of which increase stopping distance. Extra following distance gives you the room needed to stop smoothly and safely. Tank drivers should leave more space than they would in a lighter vehicle.

When braking a smooth bore tanker, what should the driver expect?

• a.The vehicle will stop instantly
• b.The liquid will stay perfectly still
• c.The forward surge of liquid may push the vehicle even after the wheels slow✓
• d.Braking distance will be shorter than normal

In a smooth bore tank the liquid surges forward during braking and can keep pushing the vehicle. This means the truck may continue to move or lurch forward even as you brake. Drivers must brake early and gently and allow extra room to stop.

What is the safest way to brake to avoid a skid in a tank vehicle?

• a.Use smooth, gradual braking and slow down early✓
• b.Pump the brakes hard on dry pavement
• c.Slam the brakes to stop as fast as possible
• d.Brake only while turning

Smooth, controlled braking helps prevent skids and keeps the surging liquid under control. Hard or panic braking can lock the wheels and worsen surge, leading to a skid or loss of control. Slowing down early and braking gently is the safest approach in a tanker.

If your drive wheels begin to skid in a tank vehicle, what should you do first?

• a.Apply the parking brake
• b.Steer sharply toward the skid
• c.Press the accelerator harder
• d.Take your foot off the accelerator✓

A drive-wheel skid is often caused by too much power to the wheels, so the first step is to stop accelerating. Taking your foot off the accelerator lets the wheels regain traction. Then steer in the direction you want to go and stay off the throttle until control is regained.

Why is it dangerous to brake hard while going around a curve in a tanker?

• a.It uses too much fuel
• b.It is illegal in all states
• c.It makes the liquid freeze
• d.It can cause a skid or rollover due to combined forces on the top-heavy vehicle✓

Hard braking in a curve combines braking force, cornering force, and liquid surge on an already top-heavy vehicle. This can cause the wheels to lock and skid or the vehicle to roll over. You should slow down before the curve and brake gently, if at all, while turning.

How does wet or slippery pavement affect a loaded tank vehicle?

• a.It shortens the stopping distance
• b.It increases stopping distance and the risk of skidding✓
• c.It makes the tank lighter
• d.It has no effect on a heavy tanker

Wet, icy, or slippery roads reduce traction, so it takes longer to stop and skids become more likely. A heavy, top-heavy tanker with surging liquid is even harder to control on slick surfaces. Drivers should slow down and increase following distance in poor conditions.

What is the best general strategy for driving a tank vehicle safely?

• a.Make quick lane changes to stay ahead of traffic
• b.Brake hard and late to save time
• c.Drive smoothly: brake early, accelerate gently, and steer without sudden moves✓
• d.Take curves fast so surge has no time to build

Smooth operation is the key to controlling a tanker. Gentle braking, gradual acceleration, and steady steering keep liquid surge from building up and reduce rollover risk. Sudden movements let the surging liquid take control of the vehicle.

What does 'controlled braking' mean when driving a tanker?

• a.Braking only with the trailer brakes
• b.Using the horn instead of the brakes
• c.Pumping the brakes rapidly at all times
• d.Applying the brakes firmly without locking the wheels✓

Controlled braking means applying the brakes as hard as you can without locking the wheels. Locked wheels cause a skid and loss of steering control. Keeping the wheels rolling lets you brake firmly while still steering, which is important in a heavy, surging tank vehicle.

Why should you avoid sudden steering movements in a tank vehicle?

• a.Sudden steering can start side-to-side surge and cause a rollover✓
• b.It has no effect on a loaded tank
• c.It wears out the tires evenly
• d.It saves fuel

Quick, sharp steering makes the liquid slosh from side to side, adding force that can tip a top-heavy tanker. Smooth, gradual steering keeps the surge under control and helps prevent rollover. Plan your lane changes and turns early so you never have to jerk the wheel.

On a long downgrade with a loaded tanker, what is the safest practice?

• a.Ride the brakes continuously the whole way down
• b.Speed up to get to the bottom faster
• c.Use a low gear and controlled braking to keep a safe, steady speed✓
• d.Shift into neutral and coast

On a long, steep downgrade you should select a low gear before starting down and use engine braking to help control speed. Steady, controlled brake applications keep the speed safe without overheating the brakes. Riding the brakes can cause them to fade, and a heavy tanker with surge is very hard to stop if the brakes fail.

How does liquid surge affect stopping a tank vehicle at a traffic light?

• a.It has no effect once the vehicle is stopped
• b.It can push the stopped vehicle forward into the intersection✓
• c.It makes the brakes work twice as fast
• d.It automatically holds the vehicle in place

When you brake to a stop, the liquid surges forward and can shove the vehicle ahead, sometimes into the intersection. This is especially strong in smooth bore tanks. Leaving extra stopping distance and stopping a bit early helps you account for this forward push.

What should you do before entering a curve in a loaded tanker?

• a.Apply the brakes hard in the middle of the curve
• b.Change lanes quickly
• c.Slow to a safe speed before the curve, then proceed steadily✓
• d.Accelerate to keep momentum

You should reduce your speed before you enter the curve, not while turning through it. Slowing early keeps braking and cornering forces from combining on the top-heavy vehicle. Then you can steer smoothly through the curve at a safe, steady speed.

Why must tank vehicle drivers be especially cautious of empty or partially empty tanks?

• a.Empty tanks have no center of gravity
• b.Partially filled tanks allow strong surge that can affect control✓
• c.Empty tanks are always overweight
• d.Empty tanks cannot be steered

A partially filled tank lets the liquid move freely and create strong surge during starts, stops, and turns. This surge can push or pull the vehicle unexpectedly and increase rollover risk. Drivers must anticipate the surge and handle a partial load with extra care.

What is the correct response if your tank vehicle starts to hydroplane on a wet road?

• a.Turn the wheel sharply to one side
• b.Release the accelerator and avoid hard braking or sudden steering✓
• c.Accelerate to push through the water
• d.Brake hard immediately to regain grip

Hydroplaning happens when the tires ride on a film of water and lose contact with the road. The correct response is to ease off the accelerator and keep the wheel straight, avoiding hard braking or sharp steering that could cause a skid. As the tires regain traction, you can gently slow down.

Why should you keep a steady, moderate speed rather than speeding up and slowing down often in a tanker?

• a.Speed changes have no effect on liquid cargo
• b.Frequent speed changes create repeated surge that can destabilize the vehicle✓
• c.Steady speed is illegal in work zones
• d.It uses more fuel to keep a steady speed

Every time you accelerate or brake, the liquid surges, so frequent speed changes keep the cargo in motion and reduce stability. A steady, moderate speed lets the liquid settle and keeps the vehicle more controllable. Smooth, consistent driving is safer in a tank vehicle.

What is the safest way to handle an emergency lane change in a loaded tanker?

• a.Jerk the wheel quickly to move over fast
• b.Ignore the surge and steer normally
• c.Brake as hard as possible while steering
• d.Steer smoothly and countersteer gently to avoid starting a rollover-causing surge✓

A quick, hard steering move can start a violent side-to-side surge and roll a top-heavy tanker. If you must change lanes suddenly, steer as smoothly as possible and countersteer gently to bring the vehicle back straight without over-correcting. Keeping steering inputs controlled is critical to avoid rollover.