A flatbed carries an empty 1,500 gallon storage tank that was not designed for transportation and is strapped on for the trip. Is it a tank vehicle under section 383.5?49 CFR 383.5
Does the federal tank vehicle definition cover tanks that carry gases?49 CFR 383.5
For which three load conditions must a tank endorsement applicant know proper braking procedures?49 CFR 383.119(b)
Section 380.609 requires first-time training from a registered provider for certain endorsements. Is the tank vehicle endorsement on that list?49 CFR 380.609(b)
Section 383.119 lists differences in handling between two kinds of tank interior. Which two?49 CFR 383.119(c)
Which drivers must know retest and marking requirements for the tank vehicle endorsement?49 CFR 383.119(h)
Which tests does section 383.93 require for the tank vehicle endorsement?49 CFR 383.93(c)(3)
Which topic is on the federal list of knowledge for the tank vehicle endorsement?49 CFR 383.119(a)
Show all 109 questions (101 more)
Test and inspection intervals 12
A cargo tank is designed to be loaded by vacuum and has full opening rear heads. How often is its external visual inspection due?49 CFR 180.407(c)
A cargo tank is designed to be loaded by vacuum and has full opening rear heads. How often is its pressure test due?49 CFR 180.407(c)
A cargo tank is insulated and has no manhole. How often is its pressure test due?49 CFR 180.407(c)
A cargo tank transports lading that is corrosive to the tank. How often is its internal visual inspection due?49 CFR 180.407(c)
An MC 331 cargo tank is in chlorine service. How often is its leakage test due?49 CFR 180.407(c)
From which date is the next retest of a specification cargo tank counted?49 CFR 180.407(c)
How often is the leakage test due on most specification cargo tanks?49 CFR 180.407(c)
How often must an unlined cargo tank that carries material corrosive to the tank be thickness tested?49 CFR 180.407(c)
How often must most specification cargo tanks have an external visual inspection?49 CFR 180.407(c)
How often must the lining of a lined cargo tank that carries lading corrosive to the tank be inspected?49 CFR 180.407(c)
What is the internal visual inspection interval for most specification cargo tanks?49 CFR 180.407(c)
What is the pressure test interval for most specification cargo tanks?49 CFR 180.407(c)
Overdue or damaged tanks and the visual inspection 13
A cargo tank fails a prescribed test and is not repaired and retested. What must be done with it?49 CFR 180.407(a)(6)
A cargo tank has been out of hazardous materials service for a year or more. What must happen before it is used again?49 CFR 180.407(b)(3)
A cargo tank has sustained damage that may affect its ability to retain lading. Which test does section 180.407 require?49 CFR 180.407(b)(2)
A cargo tank shows dents and gouges in the shell. What must happen before further use?49 CFR 180.407(b)(1)
A cargo tank was filled two days before its inspection due date and is still loaded when the date passes. Does the ban on transporting an overdue tank apply?49 CFR 180.407(a)(1)
A specification cargo tank's test has come due and has not been done. What may not happen?49 CFR 180.407(a)(1)
Besides damage and time out of service, what else can require a cargo tank to be tested before further use?49 CFR 180.407(b)(5)
During the external visual inspection, what must be done with remote closure devices and self-closing stop valves?49 CFR 180.407(d)(2)(iv)
The external visual inspection finds bolts and nuts missing. What does section 180.407 require?49 CFR 180.407(d)(2)(v)
Insulation prevents a complete external visual inspection of a cargo tank. What else must the tank be given?49 CFR 180.407(d)(1)
Outside of a pressure test, what is the most pressure a cargo tank may be subjected to?49 CFR 180.407(a)(2)
What does the external visual inspection require of the devices that tighten manhole covers?49 CFR 180.407(d)(2)(iii)
What does the external visual inspection require of the markings on a cargo tank?49 CFR 180.407(d)(2)(vi)
Test markings, tank markings and records 15
A cargo tank is marked 10-99 P, V, L. What does that marking record?49 CFR 180.415(b)
A cargo tank motor vehicle has several tanks built to different specifications and tested at different intervals. In what order do the test markings appear?49 CFR 180.415(c)
A cargo tank transports a Class 2 gas. Besides its identification number, what must be marked on each side and each end?49 CFR 172.328(b)
An MC 331 cargo tank is marked QT near its specification plate. What does that tell you?49 CFR 172.328(c)
How is the date shown in a cargo tank's test and inspection marking?49 CFR 180.415(b)
In the test markings on a cargo tank, what does the letter I stand for?49 CFR 180.415(b)(3)
In the test markings on a cargo tank, what does the letter K stand for?49 CFR 180.415(b)(3)
In the test markings on a cargo tank, what does the letter V stand for?49 CFR 180.415(b)(3)
The specification plate lists Max. Load rate, GPM. What does that entry give?49 CFR 178.345-14(c)
What does the marking K-EPA27 on a cargo tank show?49 CFR 180.415(b)(3)(vii)
Where on a cargo tank do the test and inspection markings go?49 CFR 180.415(b)(2)
Where on a DOT 400-series cargo tank motor vehicle are the nameplate and specification plate affixed?49 CFR 178.345-14(a)
Which entry on the specification plate tells you the most lading the cargo tank may carry by weight?49 CFR 178.345-14(c)(5)
Which item does section 178.345-14 require on a cargo tank's nameplate?49 CFR 178.345-14(b)
Which letter marks a passed pressure test on a cargo tank?49 CFR 180.415(b)(3)
Loading, outage and attendance 26
A cargo tank is loaded through a vapor-tight bottom connection, so no vapor escapes where a spark could occur. Is bonding or grounding required?49 CFR 177.837(c)(2)
A cargo tank is loaded with a flammable liquid through an open filling hole. When must the bond wire be connected?49 CFR 177.837(c)(1)
A cargo tank is loaded with a liquid that is not poisonous by inhalation. What is the least outage it must have?49 CFR 173.24b(a)(1)
A cargo tank is unloading a combustible liquid. How far from the tank may the qualified person attending it be?49 CFR 177.837(d)
A cargo tank motor vehicle is loading a Class 3 flammable liquid and its engine is not needed to run a pump. What does section 177.837 require?49 CFR 177.837(a)
A Division 6.1 poisonous liquid in Packing Group I or II is to be loaded. What MAWP must the cargo tank motor vehicle have?49 CFR 173.33(c)(5)
A DOT specification cargo tank carries a Division 6.1 poisonous liquid. When may it travel with lading retained in the product piping?49 CFR 173.33(e)
A hazardous material is hotter than the design temperature range of the bulk packaging. May it be loaded?49 CFR 173.24b(d)(1)
At what reference temperature is the required outage figured for a noninsulated tank?49 CFR 173.24b(a)(1)(i)
Before a cargo tank motor vehicle containing a hazardous material is driven, what must be true of its manhole closures?49 CFR 177.834(j)(1)
Before driving a loaded cargo tank, what must be true of the valves in its liquid discharge system?49 CFR 177.834(j)(2)
Besides being alert, what must the person attending the unloading of a cargo tank have?49 CFR 177.834(i)(3)(i)
The carrier's duty to see that unloading is attended ends when three things are true. The carrier's obligation is fulfilled and the tank is on the consignee's premises. What is the third?49 CFR 177.834(i)(2)
How close to the cargo tank must the qualified person be to attend loading or unloading in person?49 CFR 177.834(i)(3)(i)
May a hazardous material be loaded in a cargo tank if it may severely corrode or react with the tank material during the trip?49 CFR 173.33(b)(2)(iv)
No loading or unloading rate is marked on the specification plate. How high may the pressure in the tank go during the transfer?49 CFR 173.33(b)(4)
The specification plate on a bulk packaging shows a maximum weight of lading. May the tank be loaded beyond it?49 CFR 173.24b(d)(2)
Two materials would cause a fire or release toxic vapors if they mixed. May they be loaded in the same cargo tank motor vehicle?49 CFR 173.33(a)(2)
What is the least outage for a cargo tank loaded with a material poisonous by inhalation?49 CFR 173.24b(a)(1)
What limits how fast a cargo tank may be loaded or unloaded?49 CFR 173.33(b)(4)
What makes a person qualified to attend cargo tank loading in person under section 177.834?49 CFR 177.834(i)(4)
When is air pressure banned as a way to load or unload a tank?49 CFR 173.24b(c)
When may a diesel engine be left running while a cargo tank loads or unloads a Class 3 material, apart from running a pump?49 CFR 177.837(a)
While a cargo tank unloads a combustible liquid for more than five minutes, how often must the attendant observe the tank and the receiving container?49 CFR 177.837(d)
Who is responsible for making sure a cargo tank is attended while it is loaded?49 CFR 177.834(i)(1)
Who must attend a cargo tank while it is being loaded with a hazardous material?49 CFR 177.834(i)(1)
Outlets, manholes and emergency closure 10
A loading outlet extends beyond the internal self-closing stop-valve. What must be fitted at the end of that connection?49 CFR 178.345-11(c)
The actuating system for a cargo tank's self-closing outlets is sheared off in transit. What must the outlets do?49 CFR 178.345-11(b)(1)(ii)
During normal operations, how may the self-closing outlets of a cargo tank be closed?49 CFR 178.345-11(b)(1)
How fast must the self-closing system on a DOT 400-series cargo tank close all loading and unloading outlets in an emergency?49 CFR 178.345-11(b)(1)
How must an on-vehicle manually-activated remote shutoff for the internal self-closing stop valve be identified?49 CFR 172.328(d)
What must the fastenings on a manhole or fill cover withstand without the cover opening?49 CFR 178.345-5(d)
What must the safety device on a manhole, filler or washout cover do?49 CFR 178.345-5(c)
What valve must each loading and unloading outlet of a DOT 400-series cargo tank have?49 CFR 178.345-11(b)
Where must the remote means of closing a cargo tank's outlets be located, where vehicle length allows?49 CFR 178.345-11(b)(1)(i)
Where thermal activation of the remote closure is required, at what temperature must it actuate at the latest?49 CFR 178.345-11(b)(1)(iii)
Compressed gas and cryogenic cargo tanks 25
A cargo tank has an off-truck remote shut-off. When must the activation device be tested?49 CFR 177.840(o)
A cargo tank motor vehicle is subject to the emergency discharge control requirements of section 173.315(n). What must be carried on or within it?49 CFR 177.840(l)
A cargo tank motor vehicle is unloading a Division 2.1 flammable gas. When may the engine run?49 CFR 177.840(d)
A cargo tank of unodorized LPG is offered for transportation. What marking must it carry?49 CFR 172.328(e)
A chlorine cargo tank motor vehicle still has unloading connections attached. May it be moved, coupled or uncoupled?49 CFR 177.840(f)
A delivery hose shows soft spots when it is not under pressure. May it be used to unload a liquefied compressed gas?49 CFR 180.416(g)(1)
A driver is hauling a flammable cryogenic liquid and unforeseen conditions cause an excessive pressure rise. What does section 177.840 tell the driver to do?49 CFR 177.840(h)
A receiving facility supplies its own hose for unloading a liquefied compressed gas. What must the qualified person do before it is used?49 CFR 177.840(r)(1)
After each unloading of a liquefied compressed gas, what must the operator do with the delivery hose?49 CFR 180.416(c)
Before unloading a liquefied compressed gas, when must the qualified person check the hose assemblies and piping of the discharge system?49 CFR 177.840(m)
The delivery hose of a flammable gas cargo tank has no shut-off valve at its discharge end. What must be done with the engine while the connections are disconnected?49 CFR 177.840(d)
Does the pre-unloading safety check of a liquefied compressed gas cargo tank call for instruments?49 CFR 177.840(m)
During transportation, what position must each liquid discharge valve on a gas cargo tank motor vehicle be in?49 CFR 177.840(g)
During unloading from a cargo tank with a required off-truck remote shut-off, where must the activation device be?49 CFR 177.840(s)
How often must the operator of an MC 331 cargo tank in liquefied gas service visually inspect each delivery hose assembly?49 CFR 180.416(d)(1)
Product is released by accident while a liquefied compressed gas is being unloaded. What must the qualified person do?49 CFR 177.840(n)
Propane is unloaded in other than metered delivery service. How close to the cargo tank must the qualified person stay while the internal self-closing stop valve is open?49 CFR 177.840(q)(1)
What must a carrier of cryogenic liquid carbon monoxide provide to each driver?49 CFR 177.840(k)
What must the operator do each month with the emergency discharge control devices that close the internal self-closing stop valve?49 CFR 180.416(d)(3)
When a wireless off-truck shut-off transmitter is tested, how far from the cargo tank must the person testing it stand?49 CFR 177.840(o)
When may a chlorine cargo tank be left without its power unit attached?49 CFR 177.840(f)
Which condition bars a delivery hose assembly from use in unloading liquefied compressed gases?49 CFR 180.416(g)(1)
Which piping condition bars a cargo tank from unloading liquefied compressed gases?49 CFR 180.416(g)(2)
Which two items must a chlorine cargo tank motor vehicle be equipped with before it is shipped?49 CFR 177.840(e)
While hauling a flammable cryogenic liquid, how often on the road must the driver record the cargo tank pressure and the outside temperature?49 CFR 177.840(h)
How this list was compiled: Written from the Electronic Code of Federal Regulations, Title 49, sections 172.328, 173.24b, 173.33, 177.834, 177.837, 177.840, 178.345-5, 178.345-11, 178.345-14, 180.407, 180.415, 180.416, 380.609, 383.5, 383.93 and 383.119, at https://www.ecfr.gov/current/title-49, text in force on 2026-10-01, checked 2026-10-03. Each question names its section. Licence: Own work. Questions, answer choices and explanations were written for this site from the regulation text; nothing is copied from a state CDL manual, the AAMVA test item pool or another practice test.
How it works
This unofficial tanker endorsement practice test asks 109 questions from 49 CFR, checked 3 October 2026: cargo tank test intervals and markings, outage, loading attendance, manholes and emergency shutoffs. Surge, baffles and partial-load braking are left to state manuals.
Read the full guide
Four topics of nine, and the missing five
49 CFR 383.119 names nine knowledge topics for the N endorsement. Five are driving technique: surge, braking, baffles, product density, and grades and curves. State manuals teach those, so this bank asks none. It keeps to retest and marking, emergency systems, tank construction and operating practices.
Seven topics, then 25 questions
Practice comes in rounds of ten. After a round, More options shows seven topics; Loading, outage and attendance is the largest at 26 questions. Exam mode pulls 25 questions and passes at 20 right, the 80 percent in 49 CFR 383.135. A pass says nothing about surge.
Six marking letters: V external visual, I internal visual, P pressure, L lining, T thickness, K leakage.
External visual inspection is yearly, but every 6 months on vacuum-loaded tanks with full opening rear heads (180.407(c)).
Misses sit under Missed in More options until answered right.
Questions and answers
Does this CDL tanker practice test cover surge and baffles?
No. 49 CFR 383.119 lists cargo surge, baffled and non-baffled tanks and braking when empty, full and partially full as knowledge topics, but this bank keeps to facts written in the regulations. Each state teaches the handling in its CDL manual.
Is there a skills test or required training for the N endorsement?
Federal rules ask for neither. 49 CFR 383.93 requires a knowledge test for the tank vehicle endorsement, and the entry-level training rule in 380.609 names only the passenger, school bus and hazardous materials endorsements. A state may ask for more.
Which loads need the tanker endorsement, and when is hazmat needed too?
Under 49 CFR 383.5 a tank vehicle carries liquid or gas in tanks rated over 119 gallons each that total 1,000 gallons or more. If the load is also a placarded hazardous material, 383.93 requires that endorsement too, and the license shows code X.