Tank Vehicles · Practice test 1

Question 1Not answered

Why does night driving call for extra care in a placarded tank vehicle?

1. Reduced visibility makes it harder for other drivers, and for you, to react to hazards in time, and placards are harder to read from a distance in the dark
2. Tank vehicles are prohibited from driving at night in all cases
3. Extra caution at night only applies to tankers hauling flammable liquids, not other cargo
4. Placards glow in the dark, so visibility is not a concern at night

Question 2Not answered

What should you inspect regarding the tank's frame and mounting to the chassis during a pre-trip check?

1. Only the tank's paint at the mounting points
2. Mounting security is checked only during the annual DOT inspection, not as part of routine pre-trip checks
3. That the mounting is secure and free of cracks or corrosion where the tank attaches to the frame
4. Frame mounting has no bearing on tank safety

Question 3Not answered

Why does the specific gravity (density) of the liquid cargo matter when calculating how much can be safely loaded into a given tank?

1. Specific gravity has no bearing on how much liquid can be loaded
2. A denser liquid reaches the vehicle's maximum legal weight at a smaller volume than a lighter one
3. Weight limits are based only on the tank's physical volume, never the cargo's density, since volume is the only figure on the certification plate
4. All liquids weigh the same per gallon regardless of type

Question 4Not answered

Some tanks use partial, rather than full, baffles. What is the tradeoff of this design?

1. Partial baffles are only ever used in tanks hauling solids rather than liquids
2. Partial baffles reduce surge somewhat while still allowing easier cleaning than a fully baffled tank
3. Partial baffles eliminate the need for careful driving entirely
4. Partial baffles provide identical surge control to full baffles in every situation, making the choice purely about cost

Question 5Not answered

How should a driver adjust their driving if they know their tank has no internal baffles?

1. No adjustment is needed since baffles have no real effect on handling, only on how the tank is cleaned afterward
2. Treat the tank the same as a fully baffled one
3. Drive faster to compensate for the lack of baffles
4. Drive even more cautiously than usual, anticipating stronger surge effects than a baffled tank would produce

Question 6Not answered

Why are some tank vehicles designed with multiple smaller compartments rather than one large tank?

1. Compartments exist purely for cosmetic labeling purposes
2. Multiple compartments are used only to increase the tank's total weight, not to help separate or manage different products
3. It allows carrying several different products in one trip while keeping them separated, and can reduce surge in each section
4. Multi-compartment tanks are prohibited for use on public roads

Question 7Not answered

Why is it important for a tank vehicle driver to know the general properties (such as flammability) of the cargo they are hauling, even without a chemistry background?

1. Only responders need to know anything about the cargo's properties
2. This knowledge matters only when loading or unloading, never during transit
3. Cargo properties are irrelevant to how a driver should respond to any incident, since every response follows the same basic steps
4. It helps the driver make safer choices in an emergency, such as avoiding an ignition source near a flammable leak

Question 8Not answered

How does partially filling multiple compartments in a multi-compartment tank affect overall handling compared to one full compartment and others empty?

1. Multiple partially filled compartments can each surge somewhat independently, adding complexity to how the vehicle handles
2. Partially filled compartments never move at all since each is sealed off completely from the outside air, though that is not correct
3. Only completely full compartments can ever surge
4. Compartment fill level has no bearing on surge behavior

Question 9Not answered

During inspection, you find a baffle inside the tank has come loose from its mounting. What is the concern?

1. A loose baffle automatically reattaches itself once the tank is loaded with liquid
2. A loose baffle may no longer control surge effectively and could shift or cause damage inside the tank
3. A loose baffle has no effect since baffles are purely decorative and serve no functional purpose beyond a finished interior look
4. This is only a concern if the tank happens to be completely full at the time

Question 10Not answered

Why are some tank vehicles built with insulated or heated tanks?

1. Certain products need to stay within a temperature range so they don't thicken, freeze, or become unsafe to pump during transport
2. Heated tanks exist only to keep the driver's cab warm in winter
3. All tank vehicles are insulated and heated regardless of what cargo they carry, since it's a standard federal requirement, even though the manual describes a different procedure
4. Insulation and heating are added only to improve the vehicle's fuel economy

Question 11Not answered

You must stop suddenly while driving a tank vehicle that is only half full. What extra risk does the liquid surge create?

1. Surge only happens in completely empty tanks
2. The liquid surge only affects fuel economy
3. Once the wheels stop turning, the liquid inside stops moving too, since the brakes act on the whole vehicle at once
4. The moving liquid can push the vehicle forward even after the brakes have stopped the wheels, or affect steering control

Question 12Not answered

Why do some tank designs include an external rollover protection feature, such as a protective housing around top-mounted valves?

1. It helps prevent a rollover from damaging critical valves and causing a leak
2. The feature exists only to improve the vehicle's aerodynamics
3. Rollover protection features have no relationship to valve safety, since valves are rated to withstand impact on their own
4. This feature is required only on tanks under 1,000 gallons

Question 13Not answered

How can the number of axles on a tank trailer affect how it should be driven?

1. Fewer axles always provide a safer and more stable ride than a trailer built with additional axles under the same load
2. Axle count only matters for parking, not for driving
3. More axles spread the load differently and can change braking and turning behavior compared to a trailer with fewer axles
4. The number of axles has no effect on handling or braking at all

Question 14Not answered

A tank vehicle you are assigned has multiple internal compartments instead of baffles. What is one effect of this design?

1. Compartments only matter for loading multiple products, not for how much the liquid can surge inside each one
2. Compartments always eliminate the need for careful driving
3. Compartments have no effect on surge at all
4. Each compartment holds a smaller amount of liquid, which limits how much can surge at once

Question 15Not answered

Before driving away after unloading, what should you confirm about the tank's discharge valve?

1. That it has been repainted since the last trip
2. That it is left slightly open to relieve pressure while driving
3. That it is fully closed and not leaking
4. That it matches the color of the hose used

Question 16Not answered

Why should you brake earlier and more gently when driving a loaded tank vehicle compared to a dry freight vehicle?

1. Liquid movement inside the tank (surge) can push against the brakes' effect and reduce control if braking is abrupt
2. It has no real difference from driving a dry freight vehicle, since both cargo types are secured and don't shift once loaded
3. Tank vehicles always have weaker brakes
4. Only the speed limit changes, not braking technique

Question 17Not answered

Why might some tank vehicles designed for cryogenic liquids look different from standard liquid cargo tanks?

1. The difference is purely a matter of exterior paint color
2. Cryogenic tanks never require any special design features
3. They typically include heavy insulation and specialized construction to maintain extremely low temperatures
4. Cryogenic tanks are visually identical to standard tanks in every respect, aside from a small warning label near the valve

Question 18Not answered

What should you check regarding the emergency shutoff valve on a tank vehicle?

1. That it is welded shut for safety
2. That it is painted to match the tank
3. That it operates smoothly and can quickly stop the flow of product in an emergency
4. That it is optional equipment on liquid tanks and can be skipped during inspection

Question 19Not answered

What is liquid surge in a tank vehicle?

1. The forward and backward, or side-to-side, movement of liquid cargo inside a partially filled tank
2. A sudden increase in tire pressure
3. An electrical surge in the vehicle's wiring caused by a short circuit near the tank's sensors, since that is the assumption many drivers make before gaining experience
4. The vehicle's engine suddenly gaining power

Question 20Not answered

What should you check regarding the tank shell for dents, cracks, or corrosion during a pre-trip inspection?

1. Shell condition matters only for tanks over ten years old
2. That there is no visible damage that could weaken the tank's structural integrity
3. Only the tank's exterior paint condition, not the metal itself
4. Tank shells never need visual inspection since they are built to withstand any damage

Question 21Not answered

Why is it important to check that the tank is not overfilled beyond its rated capacity, considering outage requirements?

1. Outage requirements apply only to tanks carrying hazardous materials, not to water or other non-regulated liquids
2. Overfilling always improves the tank's stability while driving
3. Overfilling leaves no room for liquid expansion and increases the risk of a dangerous overflow or excess pressure
4. Filling to full rated capacity is always required by regulation

Question 22Not answered

How does a baffle differ from a bulkhead inside a cargo tank?

1. A bulkhead actually has openings that let liquid flow slowly, while a baffle is the one that fully seals off compartments
2. A baffle has openings that let liquid pass through slowly, while a bulkhead fully separates the tank into sealed compartments
3. Baffles and bulkheads are both used only for cleaning purposes
4. A baffle and a bulkhead are simply two different names for the exact same part

Question 23Not answered

A tank vehicle's tank could physically hold more liquid than is actually loaded onto it. Why might a driver or shipper intentionally leave it short of full volumetric capacity?

1. Partial filling is done only to make the tank easier to clean afterward
2. Shippers underfill mainly to reduce paperwork, not because of weight limits
3. Filling it completely could put the vehicle over its legal weight limit, since dense liquids can reach that limit before the tank is physically full
4. Leaving room in the tank has no relationship to legal weight limits

Question 24Not answered

During unloading, a valve becomes stuck partway open and product keeps flowing after you try to stop it. What should you do?

1. Leave the vehicle unattended to get a wrench from the shop a few minutes down the road
2. Disconnect the hose while product is still flowing
3. Use the emergency shutoff to stop the flow and contain the spill, then get help
4. Continue unloading as if nothing happened

Question 25Not answered

You need to back a loaded tank vehicle into a tight delivery area. What should you keep in mind beyond the usual backing precautions?

1. Slow, gradual movements matter even more, since a sudden correction can set off surge that shifts the vehicle's balance while maneuvering at low speed
2. A helper is not needed since tank vehicles have better rear visibility than other trailers
3. You should back quickly to minimize the time spent in the tight space
4. Backing a tank vehicle requires no different care or attention than backing an identical trailer that happens to be empty, since the liquid stays still whenever the vehicle itself isn't moving forward

Question 26Not answered

You find a small leak near a valve on a tank vehicle during inspection. What should you do?

1. Tighten the valve and continue the trip
2. Do not drive the vehicle until the leak is fixed
3. Drive slowly to reduce pressure on the leak until you reach a shop that can look at it
4. Note it for the next scheduled inspection

Question 27Not answered

Why can surge make a tank vehicle feel like it is still moving forward even after the driver has fully stopped braking at an intersection?

1. It only happens with tanks carrying gas, never liquid
2. It only happens in tanks carrying refrigerated liquids
3. The liquid's forward momentum can push against the front of the tank, transferring a bit of force to the vehicle even at a stop
4. This sensation never actually occurs in a tank vehicle, regardless of how full the tank is or how hard the driver brakes, which is not how the system is actually designed to work in practice

Question 28Not answered

Why is it especially important to stay calm and avoid sudden steering during any tank vehicle emergency?

1. Staying calm only matters when hauling hazardous materials, not general cargo like water or food-grade liquids
2. Sudden steering has no special effect in a tank vehicle
3. Calm reactions are only important for the driver's own comfort
4. Sudden movements can add to the liquid's surge and make loss of control more likely

Question 29Not answered

Why should a tank vehicle driver be cautious of driving on an off-camber or uneven road surface?

1. Uneven surfaces can encourage the liquid to shift toward the lower side, adding to rollover risk
2. Off-camber roads have no effect on liquid cargo stability, since the tank is bolted firmly to the frame
3. Uneven surfaces improve tank vehicle stability
4. It only matters for solid cargo, not liquid loads

Question 30Not answered

Why do longer cargo tanks generally need more baffles than shorter ones?

1. A longer column of liquid has more room to build momentum, so additional baffles are needed to break up the surge along its length
2. Longer tanks never need any baffles at all regardless of their length, since the liquid settles naturally over distance, overlooking how the equipment actually behaves in that situation
3. Baffle count is based only on the tank's color, not its length
4. The number of baffles has nothing to do with the tank's length