The operator's description says a tank is divided by solid bulkheads into smaller tank compartments. A driver assumes the whole load still occupies one freely connected liquid space. What needs correcting?
Correct answer: The bulkheads divide the tank into separate smaller compartments
The manual describes bulkheads as dividing some liquid tanks into several smaller tanks. That compartmented layout is different from a single freely connected space, but it does not eliminate liquid movement within each partly filled compartment.
Source: North Carolina Commercial Driver's License Manual, current NCDMV-linked copy; 2005 CDL Testing System, July 2014. Section 8, 8.2.3 - Bulkheads; contrast 8.2.4 - Baffled Tanks; literal printed page 8-8-2, physical 104. Reviewed September 13, 2026. ↗
After a delivery, several rear compartments of a bulkhead-divided tanker are empty while loaded front compartments remain. The total cargo weight has decreased. What must still be assessed?
Correct answer: The remaining load's front-to-rear weight distribution
A lower total cargo weight does not by itself establish suitable distribution. When individual compartments are loaded or unloaded, check that too much weight is not concentrated at the front or rear. No universal equal-fill pattern or numerical axle limit is prescribed.
Source: North Carolina Commercial Driver's License Manual, current NCDMV-linked copy; 2005 CDL Testing System, July 2014. Section 8, 8.2.3 - Bulkheads, weight distribution when loading/unloading smaller tanks; literal printed page 8-8-2, physical 104. Reviewed September 13, 2026. ↗
A tank has internal baffles with openings through which liquid can pass. Which description matches their effect on liquid movement?
Correct answer: They allow flow while helping control forward-and-backward surge
Baffles have openings that allow liquid flow while helping control forward-and-backward surge. They are not sealed partitions that stop all liquid movement.
Source: North Carolina Commercial Driver's License Manual, current NCDMV-linked copy; 2005 CDL Testing System, July 2014. Section 8, 8.2.4 - Baffled Tanks, openings and forward/backward surge; literal printed page 8-8-2, physical 104. Reviewed September 13, 2026. ↗
A driver of a partly filled baffled liquid tank says a quick sideways maneuver cannot create a surge problem because baffles are installed. Which limitation is being overlooked?
Correct answer: Side-to-side surge can still occur despite the baffles
Baffles help control longitudinal surge but do not eliminate side-to-side liquid movement. That lateral movement can contribute to rollover risk, so baffling is not permission for abrupt steering.
Source: North Carolina Commercial Driver's License Manual, current NCDMV-linked copy; 2005 CDL Testing System, July 2014. Section 8, 8.2.4 - Baffled Tanks, side-to-side surge and rollover limitation; literal printed page 8-8-2, physical 104. Reviewed September 13, 2026. ↗
A driver familiar with baffled tanks is assigned a partly filled smooth-bore liquid tank with no internal surge-control baffles. What handling difference should be anticipated during starts and stops?
Correct answer: Forward-and-backward liquid surge can be especially strong
A smooth-bore tank lacks internal baffles that slow lengthwise liquid flow, so forward-and-backward surge can be strong. Starts and stops require particular smoothness. No claim is made that sanitation rules universally forbid baffles for food products.
Source: North Carolina Commercial Driver's License Manual, current NCDMV-linked copy; 2005 CDL Testing System, July 2014. Section 8, 8.2.5 - Un-baffled Tanks, smooth-bore definition and strong longitudinal surge; literal printed page 8-8-2, physical 104. Reviewed September 13, 2026. ↗
A loading plan leaves the specified empty space above an ordinary liquid cargo rather than filling the tank to its maximum volume. What purpose does that outage serve as the cargo warms?
Correct answer: It leaves room for thermal expansion of the liquid
Outage is space left for liquid expansion. Liquids can expand as they warm, so the correct load plan must preserve the cargo-specific required space; outage does not eliminate surge or other inspection and weight checks.
Source: North Carolina Commercial Driver's License Manual, current NCDMV-linked copy; 2005 CDL Testing System, July 2014. Section 8, 8.2.6 - Outage; literal printed page 8-8-2, physical 104. Reviewed September 13, 2026. ↗
A tank approved for a new liquid product has the same physical capacity as before. May the planner automatically use the previous product's outage allowance?
Correct answer: No; different liquids can require different expansion allowances
Different liquids expand by different amounts, so their required outage can differ. Verify the requirement for the actual cargo and conditions instead of copying another product's allowance. This is not a numerical fill limit or a product-handling procedure.
Source: North Carolina Commercial Driver's License Manual, current NCDMV-linked copy; 2005 CDL Testing System, July 2014. Section 8, 8.2.6 - Outage, product-dependent expansion and requirement; literal printed page 8-8-2, physical 104. Reviewed September 13, 2026. ↗
A loading planner compares two permitted liquid cargoes for the same suitable tank. The second liquid is denser. Why might its allowed load leave more unused tank volume?
Correct answer: The weight limit may be reached with a smaller volume of the denser liquid
The same volume of a denser liquid weighs more. A weight limit can therefore be reached before the tank's physical volume is filled. The load must also meet its expansion requirements and other applicable loading conditions; no legal weight number is invented.
Source: North Carolina Commercial Driver's License Manual, current NCDMV-linked copy; 2005 CDL Testing System, July 2014. Section 8, 8.2.7 - How Much to Load?, dense liquid, weight and load limits; literal printed page 8-8-2, physical 104. Reviewed September 13, 2026. ↗
A liquid-tank driver can see a routine stop well ahead and has room to prepare. Which plan follows the tank section's advice for controlling surge?
Correct answer: Begin slowing well in advance so the stop can be made smoothly
Plan the slowdown early and allow adequate following room so a routine stop need not be abrupt. Liquid surge is one reason tank driving calls for smooth starts, slowdowns and stops. This does not prescribe stab braking, override ABS instructions or delay emergency braking.
Source: North Carolina Commercial Driver's License Manual, current NCDMV-linked copy; 2005 CDL Testing System, July 2014. Section 8, 8.3.1 - Drive Smoothly; 8.3.2 - Controlling Surge, early braking and following distance; literal printed page 8-8-2, physical 104. Reviewed September 13, 2026. ↗
A liquid tanker has a safe gap for a planned lane change. What should characterize the steering movement as the driver enters that gap?
Correct answer: A smooth, controlled movement that avoids abrupt sideways loading
Section 8 calls for smooth turns and lane changes because tankers combine liquid movement with a high center of gravity. Use the safe gap without adding an abrupt sideways demand. This is tank-specific control smoothness, not an instruction to ignore ordinary observation and signaling.
Source: North Carolina Commercial Driver's License Manual, current NCDMV-linked copy; 2005 CDL Testing System, July 2014. Section 8, 8.3.1 - Drive Smoothly; 8.2.4 lateral surge context; literal printed page 8-8-2, physical 104. Reviewed September 13, 2026. ↗
