Tank Vehicles · Practice test 3

Question 1Not answered

Why should you check the manhole covers and vents on a cargo tank for tight sealing before a trip?

1. A loose or damaged seal can let liquid escape or air enter, affecting both safety and the load's integrity
2. Manhole covers are purely for access during loading and have no sealing function once the tank is closed up
3. They are only checked during scheduled annual maintenance
4. Sealing only matters for tanks carrying food-grade products

Question 2Not answered

Why should a tank vehicle driver use gentler acceleration and braking than they might in a dry van of similar weight?

1. It reduces the surge of liquid inside the tank that can otherwise upset the vehicle's balance
2. Dry vans and tank vehicles require identical driving techniques
3. Gentle acceleration and braking have no relationship to liquid movement inside the tank, since the tank shell absorbs any internal shift
4. It is only relevant when the tank is completely full

Question 3Not answered

Why might surge feel different, and potentially more severe, in a tank without internal baffles compared to one with them?

1. Without baffles, liquid can move more freely across the full length of the tank, creating a stronger surge
2. Tanks without baffles always surge less than those with baffles, since there's nothing inside to disturb the liquid's flow
3. Baffles have no effect on how surge feels or behaves
4. Surge only occurs in tanks that have baffles installed

Question 4Not answered

Why might a tank vehicle's construction material, such as aluminum versus steel, matter to a driver?

1. Material choice has no relationship to legal weight limits whatsoever
2. All tank materials weigh exactly the same regardless of how they're constructed, since DOT sets a single standard weight, since that is the assumption many drivers make before gaining experience
3. Tank material only affects the vehicle's available paint options
4. Different materials affect the vehicle's weight, which changes how much cargo weight can be legally carried and how the vehicle handles

Question 5Not answered

During pre-trip inspection, what should you check about the hoses used to load or unload a tank vehicle?

1. That they were manufactured within the last week
2. That they are the same length as the vehicle's wheelbase, regardless of their actual condition
3. That they are free of cracks, cuts, or worn fittings that could leak product under pressure
4. That they match the color of the tank

Question 6Not answered

Why might an elliptical tank shape handle differently in a rollover situation than a fully cylindrical tank of the same capacity?

1. Tank shape has no effect on rollover behavior
2. Elliptical tanks are always heavier than cylindrical ones of the same capacity, due to their more complex shape, which many new drivers wrongly assume is safe
3. Only cylindrical tanks are legal for highway use
4. An elliptical shape generally sits lower and wider, which can change the vehicle's rollover threshold compared to a tall cylindrical tank

Question 7Not answered

You notice a small fire near your tank vehicle while it is parked at a loading area. What should you do?

1. Drive away immediately without alerting anyone nearby
2. Stay close to monitor the fire's progress
3. Open the tank to check whether the fire has reached the product before deciding what to do next, something an examiner would mark as an unsafe habit
4. Move away to a safe distance and alert others, rather than trying to fight it yourself near the tank

Question 8Not answered

Why should you check hoses and fittings used for loading and unloading the tank for wear or damage, even if they are not permanently mounted?

1. Loading hoses are the shipper's responsibility and never need driver inspection before connecting them
2. A worn or damaged hose or fitting can leak liquid or hazardous vapor during loading or unloading
3. Fittings only need checking after they have already failed once
4. Hose condition has no bearing on safe loading or unloading

Question 9Not answered

You are approaching a curve in a loaded tank vehicle. What should you do before entering the curve?

1. Brake while turning through the curve
2. Maintain the same speed since tank vehicles handle curves like any other truck once the load is properly secured
3. Slow down before the curve, since liquid surge can add extra outward force once you're already turning
4. Speed up slightly to reduce time spent in the curve

Question 10Not answered

Why might a tank vehicle carrying a dense liquid, like certain chemicals, need different handling than one carrying a lighter liquid at the same volume?

1. A denser liquid weighs more for the same volume, which changes the vehicle's total weight and stopping distance
2. Liquid density has no effect on the vehicle's weight, since weight is set only by how full the tank looks, which is not how the system is actually designed to work in practice
3. Only the tank's color changes with liquid density
4. Denser liquids always reduce surge to zero

Question 11Not answered

Your tank vehicle is involved in a collision and you suspect the tank has been damaged. What should you do?

1. Ignore it if there is no visible liquid on the ground
2. Immediately open the tank to inspect the inside
3. Continue to the destination if the vehicle still drives normally, since handling issues would show up immediately
4. Move people away from the area and check for leaks or damage before continuing, calling for help if needed

Question 12Not answered

Why should a driver avoid attempting to move a leaking tank vehicle themselves unless directed to do so by trained responders?

1. Moving a leaking vehicle always improves the situation regardless of direction
2. Moving it could worsen the leak or create a hazard along a new path, and responders may have a specific plan for handling it
3. Drivers are always required to move the vehicle themselves before responders arrive, since leaving it in place is a traffic hazard
4. This concern applies only to solid cargo, not liquid loads

Question 13Not answered

Why should you check the condition of the tank's pressure relief valves during inspection?

1. A malfunctioning relief valve could fail to release excess pressure, risking tank damage or rupture
2. Relief valves are checked only once a year at scheduled maintenance, not as part of the everyday pre-trip routine
3. They only need checking if the tank is carrying a flammable liquid
4. Relief valves are decorative and serve no functional purpose

Question 14Not answered

How can a driver anticipate surge before it happens, rather than only reacting to it?

1. Anticipating surge is unnecessary since it never affects vehicle handling
2. Surge only happens randomly with no relationship to driver inputs
3. By recognizing that any braking, acceleration, or turning input will set the liquid in motion and driving smoothly in anticipation
4. Only very experienced drivers can predict when surge is about to happen

Question 15Not answered

How should a driver approach a stop sign or red light differently in a tank vehicle compared to a dry van?

1. Brake at the same point and with the same force as a dry van of similar weight, since braking depends only on total weight
2. Begin slowing earlier and brake more gradually to manage the liquid's forward surge
3. No adjustment is needed regardless of how full the tank is
4. Wait until closer to the stop before braking to reduce surge

Question 16Not answered

Why do baffles reduce, but not fully eliminate, the effects of liquid surge?

1. Baffles completely stop all liquid movement inside the tank, turning it into several fully sealed sections
2. Baffles have no actual effect on liquid movement at all
3. Liquid can still move through the openings in the baffles, just more slowly than in an unbaffled tank
4. Surge is entirely unrelated to whether baffles are present

Question 17Not answered

Why is it especially important to check suspension and axle components closely on a tank vehicle?

1. Tank vehicles don't have suspension systems that need checking
2. Axle components on tank vehicles never wear out due to the smooth, cushioned ride liquid cargo supposedly provides regardless of load or mileage
3. Suspension checks only matter for empty tank vehicles
4. A loaded tank concentrates a lot of weight in one area, putting worn suspension parts under more stress than an evenly distributed dry load would

Question 18Not answered

Why do some tanks used for specific cargo, such as certain food-grade or sanitary products, lack baffles?

1. Baffles can be difficult to clean thoroughly, which matters for sanitary requirements on some cargo
2. Non-baffled tanks are always safer to drive than baffled ones
3. Baffles increase surge rather than reducing it
4. Baffles are prohibited by federal regulation on every type of tank, regardless of what cargo it is built to carry

Question 19Not answered

What should you keep in mind about a tank vehicle's center of gravity compared to a dry van of similar size?

1. Liquid cargo can shift its weight during driving, which can raise rollover risk beyond what a fixed solid load would create
2. Tank vehicles always have a lower center of gravity than dry vans
3. Only a completely empty tank vehicle has center of gravity concerns, since a loaded one sits lower and more stable, ignoring what the situation actually calls for at that moment
4. Center of gravity is identical regardless of cargo type

Question 20Not answered

What should a driver do first if they discover a leak from the tank while stopped at a rest area?

1. Attempt to seal the leak personally with tape before doing anything else, since it's usually a quick fix, even though the manual describes a different procedure
2. Ignore small leaks since they usually stop on their own
3. Move people away from the area, avoid ignition sources, and contact emergency services or the carrier as appropriate
4. Continue the trip and report the leak once you reach your destination

Question 21Not answered

Why can repeated small steering corrections make liquid surge worse instead of better?

1. Surge cannot build up over multiple steering inputs no matter how quickly they follow one another
2. Each correction can add to the liquid's existing motion, building a larger oscillation instead of letting it settle
3. Only the first steering correction in a sequence has any effect on surge
4. Repeated corrections always cancel out any surge that has already started, no matter how they're timed, the same way opposing waves cancel out in open water

Question 22Not answered

Why is surge in the side-to-side direction, during a lane change or curve, considered particularly dangerous?

1. It can shift weight toward one side of the vehicle, increasing the risk of a rollover
2. Side-to-side surge always improves lateral stability by helping counterbalance the vehicle through a turn
3. It only matters for tanks carrying flammable liquids
4. Side-to-side surge has no effect on rollover risk

Question 23Not answered

During a tank vehicle inspection, why should you check that the manhole covers and vents are properly secured?

1. Manhole covers only matter when the vehicle is parked overnight, not while it's actually moving down the road
2. It mainly protects the paint finish around the opening from scratches
3. It only affects fuel economy
4. A loose or open cover can allow product to spill or spray out while driving

Question 24Not answered

Why is stopping distance for a tank vehicle potentially longer or less predictable than for a solid-load truck of the same total weight?

1. Stopping distance is unaffected by whether the cargo is liquid or solid, since brakes respond only to total weight
2. Liquid cargo always shortens stopping distance compared to solid cargo
3. Forward surge during braking can add extra force that continues pushing the vehicle even as the brakes work to slow it
4. It only matters for tanks that are less than half full

Question 25Not answered

Strong crosswinds are forecast along your route in a partially loaded tank vehicle. What should you keep in mind?

1. Liquid cargo makes a vehicle immune to crosswind effects
2. Wind combined with liquid surge can push the vehicle more than a solid load would, so extra caution and reduced speed may be needed
3. Wind is only a concern for vehicles hauling lightweight cargo
4. Crosswinds only affect empty trailers and have no real effect on a loaded tank vehicle, since the extra weight keeps it firmly planted

Question 26Not answered

You notice the required placards on your tank vehicle are faded and hard to read. What should you do?

1. Continue the trip since the placard is technically still attached to the vehicle
2. Wait until the next scheduled inspection to deal with it
3. Replace or refresh them before the trip so they remain clearly legible
4. Cover them with a clear plastic sheet instead of replacing them

Question 27Not answered

While driving a partially loaded tank vehicle, you feel an unusual tug through the steering wheel on a straight road. What is a likely cause?

1. A tug in the steering wheel is never related to cargo movement of any kind
2. The tug means the tank is leaking and has lost enough fluid weight to affect steering, which is why any pull through the wheel should be treated as an emergency stop
3. Liquid surge shifting side to side can transmit a noticeable pull through the steering even without any input from you
4. This feeling only occurs in tank vehicles that are completely empty

Question 28Not answered

How does surge interact with braking if a driver brakes hard right as they are also turning?

1. It can combine forward and lateral forces at once, significantly increasing the risk of losing control
2. Surge from braking and surge from turning cancel each other out completely, leaving the vehicle no less stable than driving straight
3. Surge only occurs during braking, never during turning
4. Combining braking and turning has no additional effect on surge

Question 29Not answered

How can a driver reduce the effects of liquid surge while driving?

1. Surge cannot be reduced through driving technique
2. By accelerating, braking, and steering smoothly rather than abruptly
3. By driving faster to outrun the surge
4. By keeping the tank as empty as possible on every single trip, even if that means more frequent deliveries

Question 30Not answered

When does liquid surge have the greatest effect on vehicle control?

1. When the tank is completely full with no airspace
2. When the tank is partially filled, giving the liquid room to move
3. Surge is the same regardless of how full the tank is, since the liquid's total weight stays constant
4. When the tank is completely empty