CDL tanker vehicles practice test 2

B: Bulkheads divide the tank into separate smaller tanks; baffles are bulkheads with holes that let liquid flow through. Bulkheads divide a tank into several smaller tanks, while baffles are bulkheads with holes that let the liquid flow through to slow surge. Missouri Commercial Driver License Manual (AAMVA model CDL manual, Version 4.0): 8.2.3 Bulkheads; 8.2.4 Baffled Tanks, page 8-2.

A: Four times as long. When you double your speed, impact and braking distance become four times greater. Missouri Commercial Driver License Manual (AAMVA model CDL manual, Version 4.0): 2.6.1 Stopping Distance, page 2-14.

B: Up to one second. The wheels may need as long as one second to start rolling after you let off. Re-braking before they roll keeps the vehicle from straightening. Missouri Commercial Driver License Manual (AAMVA model CDL manual, Version 4.0): 2.17.2 How to Stop Quickly and Safely, page 2-34.

B: X (combination hazardous materials and tank vehicle). Drivers of tank vehicles hauling hazardous materials or waste in amounts requiring placards must add the X endorsement, showing they passed both the tank and hazmat knowledge tests. Missouri Commercial Driver License Manual (AAMVA model CDL manual, Version 4.0): 1.1 Commercial Driver License Tests (Endorsements), page 1-2.

D: Never. The manual says never drive a tank vehicle with open valves or manhole covers. Missouri Commercial Driver License Manual (AAMVA model CDL manual, Version 4.0): 8.1.2 Check Special Purpose Equipment, page 8-1.

D: An un-baffled tank with nothing inside to slow the flow of liquid. A smooth bore tank has no baffles, so nothing inside slows the liquid and the front-to-back surge is very strong. Missouri Commercial Driver License Manual (AAMVA model CDL manual, Version 4.0): 8.2.5 Un-baffled Tanks, page 8-2.

B: The vehicle may jackknife. On tank trailers, if the drive wheels or trailer wheels begin to skid, the vehicle may jackknife. Missouri Commercial Driver License Manual (AAMVA model CDL manual, Version 4.0): 8.3.5 Skids, page 8-2.

C: N. The tank vehicle endorsement is N; T is doubles/triples, P is passenger and S is school bus. Missouri Commercial Driver License Manual (AAMVA model CDL manual, Version 4.0): 1.1 Commercial Driver License Tests (Endorsements: Tank Vehicle), page 1-2.

A: Check the vehicle's operator's manual. Tank vehicles come in many types and sizes, so check the vehicle's operator's manual to make sure you know how to inspect it. Missouri Commercial Driver License Manual (AAMVA model CDL manual, Version 4.0): 8.1 Inspecting Tank Vehicles, page 8-1.

A: Sanitation regulations forbid baffles because they make the tank hard to clean. Sanitation regulations forbid baffles in tanks hauling food products because baffles make the inside of the tank difficult to clean. Missouri Commercial Driver License Manual (AAMVA model CDL manual, Version 4.0): 8.2.5 Un-baffled Tanks, page 8-2.

C: Over-steering, over-accelerating or over-braking. Too much steering, throttle or braking can start a skid. Missouri Commercial Driver License Manual (AAMVA model CDL manual, Version 4.0): 8.3.5 Skids, page 8-2.

D: Only an empty tank vehicle that, if it carried hazmat, has been purged of any residue. A CLP with an N endorsement carries the X restriction: the holder may only operate an empty tank vehicle and may not operate one that held hazardous materials unless it has been purged of residue. Missouri Commercial Driver License Manual (AAMVA model CDL manual, Version 4.0): 1.1 Commercial Driver License Tests (Restrictions), page 1-3.

B: Find out what you must carry, and make sure you have it and it works. Learn which emergency equipment your vehicle must carry, then confirm it's on board and in working order. Missouri Commercial Driver License Manual (AAMVA model CDL manual, Version 4.0): 8.1.3 Special Equipment, page 8-1.

D: They can double the normal stopping distance. Wet roads can double the normal stopping distance. Missouri Commercial Driver License Manual (AAMVA model CDL manual, Version 4.0): 8.3.4 Stopping Distance, page 8-2.

D: Take action to restore traction to the wheels. Once any vehicle begins to skid, the driver's job is to get the wheels gripping the road again. Missouri Commercial Driver License Manual (AAMVA model CDL manual, Version 4.0): 8.3.5 Skids, page 8-2.

A: The cargo is heavy, prone to shifting, and has a high center of gravity. Bulk liquid is heavy, it moves around, and it rides high, and all three make the vehicle harder to control. Missouri Commercial Driver License Manual (AAMVA model CDL manual, Version 4.0): 1.1 Commercial Driver License Tests (Endorsements: Tank Vehicle), page 1-2.

D: Weight distribution, so there is not too much weight on the front or rear. With a compartmented tank, watch how the weight is spread as you fill or empty each compartment, so the front or rear isn't overloaded. Missouri Commercial Driver License Manual (AAMVA model CDL manual, Version 4.0): 8.2.3 Bulkheads, page 8-2.

A: An empty one. Empty tank vehicles may take longer to stop than full ones, because an empty vehicle has less traction. Missouri Commercial Driver License Manual (AAMVA model CDL manual, Version 4.0): 8.3.4 Stopping Distance, page 8-2.

A: Stop braking so the rear wheels can roll again. To correct a drive-wheel braking skid, stop braking so the rear wheels roll again, then counter-steer as the vehicle comes back on course. Missouri Commercial Driver License Manual (AAMVA model CDL manual, Version 4.0): 2.19.2 Correcting a Drive-wheel Braking Skid, page 2-37.

C: It is a crime: you can be cited, stopped from driving further, and held liable for clean-up. Hauling in a leaking tank is a crime. You'll be cited, kept from driving on, and you may have to pay for the spill clean-up. Missouri Commercial Driver License Manual (AAMVA model CDL manual, Version 4.0): 8.1.1 Leaks, page 8-1.

B: Especially when starting and stopping. Forward-and-back surge is very strong in smooth bore tanks, so be extremely cautious (slow and careful), especially when starting and stopping. Missouri Commercial Driver License Manual (AAMVA model CDL manual, Version 4.0): 8.2.5 Un-baffled Tanks, page 8-2.

A: Fully loaded rigs are ten times more likely to roll over. In a crash, a fully loaded rig is ten times as likely to roll over as an empty one, because the cargo raises the center of gravity. Missouri Commercial Driver License Manual (AAMVA model CDL manual, Version 4.0): 6.1.1 Rollover Risks, page 6-1.

B: Let the vehicle slow down; stop turning and/or braking so hard. In a front-wheel skid the front end goes straight no matter how you steer; the only way to stop it is to let the vehicle slow down and stop turning or braking so hard. Missouri Commercial Driver License Manual (AAMVA model CDL manual, Version 4.0): 2.19.3 Front-wheel Skids, page 2-37.

C: The room left in a tank for the liquid to expand. Outage is the empty space left at the top of a tank so the liquid has room to expand as it warms. Never fill a cargo tank completely. Missouri Commercial Driver License Manual (AAMVA model CDL manual, Version 4.0): 8.2.6 Outage, page 8-2.

B: Keep the cargo as close to the ground as possible, and drive slowly around turns. To prevent rollover, keep the cargo as low as possible and drive slowly around turns; also keep the load centered. Missouri Commercial Driver License Manual (AAMVA model CDL manual, Version 4.0): 6.1.1 Rollover Risks, page 6-1.