Tank Vehicles · Practice test 2

Question 1Not answered

One compartment of your multi-compartment tank vehicle is only partly filled while the others are full. What should you expect?

1. A partly filled compartment behaves identically to a full one in every way, since each compartment is sealed off from its neighbors
2. No compartment can surge unless the entire tank is partly filled
3. Multi-compartment tanks eliminate surge entirely regardless of fill levels
4. That compartment can still surge on its own, even though the fully loaded compartments have little room for the liquid to move

Question 2Not answered

Why do some tank vehicles include insulation or heating elements as part of their design?

1. Insulation is added purely to reduce the vehicle's exterior noise
2. Heating elements are used only to prevent the tank's exterior paint from fading in extreme cold or direct sunlight
3. All tank vehicles include heating elements regardless of cargo type
4. Certain cargoes need to be kept within a specific temperature range to remain safe or usable during transport

Question 3Not answered

Why should a driver avoid using a cell phone or other spark-producing device near a suspected fuel or vapor leak from the tank?

1. This precaution applies only at night, not during the day
2. It is a concern only for tanks carrying solid cargo
3. A spark near flammable vapor could ignite it, causing a fire or explosion
4. Cell phones have no interaction with flammable vapors under any circumstance

Question 4Not answered

What driving technique helps reduce the impact of surge specifically when coming to a complete stop?

1. Releasing the brakes entirely well before the vehicle has slowed down
2. Braking as hard as possible right up until the vehicle stops completely gives the surging liquid the least time to build momentum
3. Accelerating briefly right before the stop to counteract surge
4. Easing off the brake pedal slightly just before the vehicle fully stops, similar to controlled braking in other vehicles

Question 5Not answered

Traffic ahead has stopped suddenly on the highway while you're driving a loaded tank vehicle. What should you do?

1. Change lanes immediately without checking mirrors to avoid stopping at all
2. Begin slowing early and smoothly, since abrupt braking risks a forward surge on top of an already hard stop
3. Wait until the last moment to brake, then apply the brakes as hard as possible to make up for lost time
4. Assume the surge will help you stop faster and brake normally

Question 6Not answered

If a tank vehicle rolls over while carrying hazardous liquid, what is the first priority?

1. Open the tank to check for internal damage
2. Keep people away from the area and follow emergency procedures for the specific material, calling for appropriate help
3. Attempt to right the vehicle immediately
4. Continue the delivery using another vehicle once the load has been transferred over at the scene, which sounds reasonable but does not hold up in practice

Question 7Not answered

Why does surge make it especially important for a tank vehicle driver to look far ahead and anticipate the need to slow down early?

1. It only matters when driving at low speeds in city traffic
2. Early, gradual braking gives the liquid more time to settle instead of surging suddenly from a late, hard stop
3. Surge is unaffected by how early or late a driver begins braking
4. Looking ahead has no relationship to how surge affects the vehicle, since surge only depends on the road surface itself

Question 8Not answered

Two tank vehicles carry the same volume, one water and one gasoline. Why might posted curve advisory speeds still call for extra caution in both?

1. Gasoline cannot surge the way water does
2. Only the heavier liquid needs any caution at all
3. Advisory speeds only apply to empty tank vehicles, since a loaded tank's weight keeps it planted through the curve
4. Liquid surge affects handling in a curve regardless of which liquid is being hauled, even though the weights differ

Question 9Not answered

Why does a tank vehicle's shape (typically round or elliptical) matter for structural strength compared to a rectangular box trailer?

1. A round or elliptical shape distributes internal pressure from the liquid more evenly, reducing stress points
2. Tank shape has no relationship to how internal pressure is distributed, since pressure depends only on the liquid's volume
3. Shape only matters for the tank's exterior appearance
4. Rectangular tanks are always stronger than round ones for liquid cargo

Question 10Not answered

What is the purpose of a pressure relief valve on some tank vehicles?

1. To release excess pressure inside the tank before it can rupture the tank
2. To lock the tank shut during transport
3. To measure how much liquid remains inside the tank using a built-in pressure sensor
4. To increase the flow rate during unloading

Question 11Not answered

Your loaded tank vehicle begins to sway after a sudden steering movement. What should you do?

1. Turn the wheel sharply in the opposite direction to cancel out the sway before it builds further
2. Brake hard immediately to stop the sway
3. Ease off the accelerator and steer smoothly to regain stability, avoiding sudden corrections
4. Accelerate to power through the sway

Question 12Not answered

Why should you verify the correct placards are displayed and match the cargo before a trip, in addition to checking the tank itself?

1. Placards inform others and responders of what is being carried, and incorrect ones could mislead an emergency response
2. Placard accuracy only matters for interstate trips, not local deliveries that stay within one city, even though it runs against what the CDL manual actually says
3. Placards are purely decorative and unrelated to the cargo carried
4. Placards only need checking if the tank is completely full

Question 13Not answered

Before loading a flammable liquid into a tank vehicle, why is a bonding or grounding cable connected between the tank and the loading rack?

1. To equalize static electricity between the tank and the rack so a spark doesn't ignite vapors
2. To power the loading rack's pump motor
3. To measure how much liquid has been loaded
4. To hold the tank vehicle in place during loading so it can't roll away from the rack, a habit some drivers pick up that examiners specifically watch for

Question 14Not answered

Why should a tank vehicle driver avoid overcorrecting the steering wheel if the vehicle drifts slightly out of the lane?

1. A sharp overcorrection can send the liquid surging in the opposite direction and worsen the vehicle's instability
2. Overcorrecting has no different effect on a tank vehicle than on an empty straight truck, since both are steered the same way
3. Overcorrection is the recommended way to return to the lane in a tank vehicle
4. Sharp corrections always improve tank vehicle stability

Question 15Not answered

Why is sudden braking especially risky for a tank vehicle that is already partway down a steep grade?

1. The grade and the liquid's forward surge combine, adding to the forces the brakes already have to overcome
2. Sudden braking is actually safer on a grade than on flat ground, since gravity helps slow the vehicle faster
3. Grades have no real effect on liquid surge
4. Surge only occurs on flat, straight roads

Question 16Not answered

What is the primary function of baffles inside a cargo tank?

1. To measure how much liquid is inside the tank
2. To divide the tank into sections and slow the forward-and-back movement of liquid cargo
3. To provide structural support for the tank's exterior paint and prevent it from cracking under vibration
4. To filter contaminants out of the liquid cargo

Question 17Not answered

What is the purpose of baffles inside a liquid tank?

1. They cool the liquid during transport
2. They keep the liquid at a steady temperature so it does not expand and contract during transport
3. They increase the tank's total capacity
4. They slow down the front-to-back surge of the liquid by dividing the tank into sections

Question 18Not answered

What should a driver do if they suspect the tank has been damaged in a minor collision, even if no leak is immediately visible?

1. Stop and thoroughly inspect the tank before continuing, since damage may not be immediately obvious
2. Assume the tank is fine unless a warning light activates
3. Continue driving since no visible leak means no real damage occurred to the tank or its fittings
4. Wait until the next scheduled stop to check for damage

Question 19Not answered

If a tank vehicle rolls over, what should a driver who is uninjured and able to move safely do first?

1. Inspect the tank up close to assess the damage right away
2. Move away from the vehicle to a safe distance and avoid actions that could create sparks or ignition near any leaking cargo
3. Stay inside the cab until help arrives regardless of any leak, since the cab is sealed off from the tank, regardless of what the road or weather conditions actually call for
4. Immediately attempt to right the vehicle themselves

Question 20Not answered

Why should lane changes be made gradually in a loaded tank vehicle?

1. Surge only becomes noticeable at highway speeds, not around town
2. Quick lane changes actually improve the vehicle's stability
3. Lane changes carry no special risk in a tank vehicle compared to other trucks
4. A quick lane change can start a side-to-side surge that is hard to control

Question 21Not answered

What is a 'smooth bore' tank, and how does it typically compare to a baffled tank in terms of handling?

1. A tank with more baffles than usual, producing weaker surge effects
2. A tank that automatically compensates for surge electronically
3. A tank with no internal baffles, which generally produces stronger surge effects than a baffled design
4. A term unrelated to internal tank structure, referring only to the smoothness of the tank's outer paint coat

Question 22Not answered

Why is a partially loaded tank sometimes more difficult to control than a completely full or completely empty one?

1. Partial loads are always lighter and therefore safer to handle
2. Liquid movement is unaffected by how full the tank is
3. A partially loaded tank always handles more predictably than a full tank, since there's less total weight to manage
4. There is more room for the liquid to slosh and surge, amplifying the effect on vehicle handling

Question 23Not answered

How should a driver adjust their speed approaching a curve when hauling a tank vehicle, compared to a dry van of the same weight?

1. Curve speed matters only for tanks carrying flammable liquids
2. Increase speed slightly to keep the liquid from shifting
3. Slow down more than usual, since liquid surge can add extra lateral force during the turn
4. No adjustment is needed since liquid cargo behaves identically to solid cargo once it's sealed inside the tank

Question 24Not answered

Why should tire inspection get extra attention on a loaded tank vehicle compared to an empty one?

1. Only the steer tires need checking on a loaded tank vehicle
2. Tire condition matters exactly the same regardless of whether the vehicle is loaded or completely empty, since tires are rated for their maximum capacity either way
3. The concentrated weight of the liquid cargo puts more load and heat stress on the tires, making a weak tire more likely to fail
4. Tank vehicles use special tires that never need inspection

Question 25Not answered

Why should following distance be increased even further when driving a loaded tank vehicle in traffic?

1. Following distance for tank vehicles is the same as for any other truck regardless of load, since braking systems are standardized across vehicle types
2. Following distance only matters in stop-and-go highway traffic, not city driving
3. Sudden braking risks setting off a forward surge, so more distance gives you room to slow down gradually instead of abruptly
4. Tank vehicles stop faster than other trucks, so distance can actually be reduced

Question 26Not answered

What should you check about the bottom outlet valve (the discharge valve at the base of the tank) before driving?

1. That it is left slightly open to relieve pressure during transit
2. The bottom outlet valve does not need checking if the top is sealed
3. That it is fully closed and not leaking
4. Only that it is a specific color

Question 27Not answered

Why might a multi-compartment tank, divided into several separate sealed sections, handle surge differently than a single large baffled tank?

1. Each compartment holds its own smaller volume of liquid, which can reduce the total surge compared to one large connected space
2. Multi-compartment tanks are never used for liquid cargo
3. Multi-compartment tanks always produce more surge than a single large tank, since each seam adds another point of movement, something an examiner would mark as an unsafe habit
4. Compartments have no relationship to how much liquid can surge at once

Question 28Not answered

Why do baffles have openings rather than being solid dividers across the entire tank?

1. Openings let liquid pass through slowly and let the tank be loaded, unloaded, and cleaned as a single unit
2. Openings exist purely by manufacturing accident with no intended purpose
3. Openings are required only for tanks carrying food-grade liquids
4. Solid dividers would improve surge control more than baffles with openings, which is why some older tanks used them instead

Question 29Not answered

If you smell a strong odor from your tank vehicle's cargo while driving, what should you do?

1. Open all the windows and continue at highway speed
2. Ignore it unless a warning light also comes on
3. Find a safe place to stop and check for a leak, since an odor can indicate the product is escaping
4. Continue driving since odors are normal for some products and usually fade once you're back up to speed

Question 30Not answered

How does a partially loaded tank vehicle's stopping distance compare to a fully loaded one at the same speed?

1. It is always shorter and more predictable
2. Stopping distance is unaffected by how full the tank is, since the brakes are sized for the vehicle's maximum rating
3. It can be less predictable, since surging liquid can keep pushing the vehicle forward as it brakes
4. It is identical, since both count as a loaded vehicle