Gross Combination Weight Rating

AL · GK Endorsement

Alabama General Knowledge CDL Practice Test

Below are 25 exam-style questions for the Alabama General Knowledge CDL knowledge test, modeled on the FMCSA-aligned content used by the Alabama Law Enforcement Agency (ALEA) Driver License Division. Try to answer each question on your own before reading the answer key directly under it. The questions and answer choices are shuffled deterministically per state and endorsement, so the order will stay the same on repeat visits — that lets you genuinely measure your improvement.

Heads up: this is a study tool, not a graded exam. Cover the answer with your hand or a sheet of paper for an honest practice run, then re-read the explanations for any questions you missed. Aim for 22 out of 25 or better, three times in a row, before scheduling the real exam.

Question 1 of 25

Skids are most often caused by:

A Properly working brakes
B Old tires
C Manual transmissions
D Driving too fast for conditions

Correct answer: D

The dominant cause of skids identified by the FMCSA is driving too fast for the road or weather. Sudden steering, hard braking, or hard acceleration usually triggers them.

Question 2 of 25

Which is true about driving in rain?

A It is safe to drive at the posted speed limit
B Roads are most slippery just after rain begins, when water mixes with road oil
C High beams improve visibility in heavy rain
D Tire chains are required by federal law

Correct answer: B

The first few minutes of rain mix with oil and grime on the road and create the slipperiest conditions. Slow down and increase following distance.

Question 3 of 25

Acceleration must be smooth and gradual to avoid:

A Powertrain wear and possible loss of control on slippery surfaces
B Wasting fuel only
C Annoying passengers
D Engine damage

Correct answer: A

Quick throttle inputs on slick surfaces can spin the drive wheels and cause a tractor jackknife. Smooth acceleration avoids this and reduces wear.

Question 4 of 25

A vehicle's "no-zone" is:

A The area immediately next to it where other drivers are hidden in your blind spots
B The fuel tank area
C A federal speed restriction
D The area in front of the steer axle

Correct answer: A

No-zones are the four blind-spot areas (front, rear, and both sides) where smaller vehicles are difficult or impossible to see in your mirrors.

Question 5 of 25

When driving at night, you should adjust speed so that you can stop within:

A Half the range of your low-beam headlights
B The range of your low-beam headlights
C Whatever speed feels safe
D The full range of high-beam headlights when in use

Correct answer: B

Always be able to stop within the distance you can see. At night with low beams, that's typically about 250 feet.

Question 6 of 25

When the road is slippery, you should:

A Make smooth steering and braking inputs
B Increase following distance
C All of the above
D Slow down

Correct answer: C

Slippery roads require all three: more cushion, smoother inputs, and lower speed.

Question 7 of 25

A leaking exhaust system is dangerous because:

A It can let poisonous carbon monoxide into the cab
B It is illegal
C It increases fuel use
D It causes the engine to overheat

Correct answer: A

Carbon monoxide from a leaking exhaust can cause headaches, drowsiness, and unconsciousness. The illegality is real but the safety risk is the bigger answer.

Question 8 of 25

A driver who has lost the ability to safely brake the vehicle on a downgrade should:

A Look for an escape ramp
B Coast in neutral
C Shift into reverse
D Use the parking brake hard

Correct answer: A

Long downgrades have escape ramps for runaway trucks. Use them. Coasting in neutral is illegal in many states and worsens the problem.

Question 9 of 25

When checking the engine compartment, you should make sure that:

A Engine oil level is safe to operate
B All of the above
C Coolant level is above LOW and the cap is secure
D Power steering fluid is at the proper level

Correct answer: B

A proper engine-compartment check covers oil, coolant, power steering fluid, windshield washer fluid, hoses, belts, and electrical wiring. Skipping any one of them defeats the purpose of the inspection.

Question 10 of 25

A driver convicted of a major offense (DUI, leaving the scene, etc.) in a CMV faces:

A A fine only
B No federal consequence
C A warning
D CDL disqualification for at least one year for a first offense

Correct answer: D

Major offenses carry a one-year CDL disqualification minimum (three years if hauling hazardous materials), and lifetime for a second.

Question 11 of 25

Which is true about the use of turn signals?

A Signal early, signal continuously, and cancel after the turn
B Use the four-way flashers instead of signals at intersections
C Signal only when other vehicles are present
D Signal only at the moment you start turning

Correct answer: A

The federal model manual specifies signal early, continuously, and cancel after — the same three steps every state CDL test asks about.

Question 12 of 25

Stopping distance is made up of:

A Perception distance + reaction distance + brake-lag distance + braking distance
B Brake-lag distance only
C Reaction distance only
D Speed times weight

Correct answer: A

Total stopping distance has four parts. Air brakes add a brake-lag distance not present in hydraulic systems.

Question 13 of 25

What does GVWR stand for?

A General Vehicle Weight Reading
B Government Vehicle Weight Regulation
C Gross Vehicle Weight Rating
D Gross Vehicle Width Rating

Correct answer: C

GVWR is the maximum weight the manufacturer says a single vehicle can safely weigh, including itself plus its load.

Question 14 of 25

The two main reasons why a driver's feet are kept off the brakes when not actively braking are:

A To save brake pads and reduce drag
B So the brake lights don't mislead following drivers and so the brakes don't overheat
C To save fuel and improve mileage
D To rest the right leg

Correct answer: B

Riding the brake lights confuses drivers behind you and gradually heats the friction surfaces, both of which are safety problems.

Question 15 of 25

Stab braking is used:

A On vehicles without ABS, to keep them straight in an emergency
B To save fuel
C On wet roads only
D On vehicles with ABS

Correct answer: A

Stab braking — full application then release as soon as wheels lock, then re-apply — is for non-ABS vehicles. With ABS, do not pump.

Question 16 of 25

The maximum allowable on-duty driving time after 8 consecutive hours off duty is:

A 16 hours
B 11 hours
C 14 hours
D 10 hours

Correct answer: B

After 10 hours off duty, a property-carrying driver may drive up to 11 hours, within a 14-hour on-duty window.

Question 17 of 25

Which of the following is a valid reason to refuse a load?

A All of the above
B It would make you exceed federal hours-of-service rules
C The cargo is not properly secured or placarded
D It would push your weight over legal limits

Correct answer: A

A driver is required by federal law to refuse loads that violate HOS, weight, or hazmat rules. The driver, not the dispatcher, is liable.

Question 18 of 25

A driver must report any accident involving a CMV to the carrier within:

A 1 hour
B 24 hours
C 7 days
D A reasonable time, before going off duty

Correct answer: D

FMCSA rules require notification of the motor carrier in a reasonable time — most policies treat that as before going off duty.

Question 19 of 25

How does ABS help in an emergency stop?

A It prevents wheel lockup so the driver can keep steering
B It always stops the vehicle in a shorter distance
C It increases brake pressure automatically
D It applies the parking brake

Correct answer: A

ABS keeps the wheels rolling so steering control is preserved. It is not a shorter-distance device.

Question 20 of 25

GCWR stands for:

A Government Combination Weight Reading
B General Carrier Weight Rating
C Gross Combination Weight Rating
D Gross Cargo Weight Rating

Correct answer: C

GCWR is the maximum allowable weight of a power unit plus a towed unit, including all cargo. It determines whether a license is Class A.

Question 21 of 25

When approaching a curve, you should:

A Stay at the same speed
B Brake while in the curve
C Downshift in the curve
D Slow down before entering and accelerate gently through it

Correct answer: D

Speed should already be set before the curve. Braking or downshifting in a curve can upset the vehicle's balance.

Question 22 of 25

When backing a heavy vehicle, you should:

A Back without using mirrors so you can watch out the window
B Use a helper and walk around the vehicle first
C Back fast to get it over with
D Back to the right whenever possible

Correct answer: B

Always GOAL — Get Out And Look — and use a helper. Backing to the left when possible is preferred because you can see better, not to the right.

Question 23 of 25

Which is required when stopping on the side of a level, straight, two-lane road?

A A flare burning constantly
B A spotter walking 1,000 ft up the road
C Three reflective triangles: 10 ft, 100 ft, and 200 ft toward approaching traffic
D One reflective triangle within 10 feet

Correct answer: C

On a level straight road, place triangles 10 feet behind the vehicle, 100 feet, and 200 feet to the rear in the direction of approaching traffic.

Question 24 of 25

Which of the following is the correct order for the seven-step pre-trip air-brake check (last steps shown)?

A Test the service brake then the parking brake
B Test only the air-leak rate
C Test the low-air warning then drive
D Test the parking brake then the service brake

Correct answer: D

In the standard FMCSA seven-step procedure, the parking brake is tested before pulling away, then the service brake stop is the final step.

Question 25 of 25

Hours-of-service records are required to be kept by:

A The dispatcher only
B The carrier only
C No one
D The driver, in the form of a logbook or electronic logging device

Correct answer: D

Drivers are responsible for accurate hours-of-service records, kept either on paper logs or, for most carriers, on an ELD.

Study tips for the Alabama General Knowledge exam

The General Knowledge portion of the Alabama CDL exam is graded out of the bank of questions the Alabama Law Enforcement Agency (ALEA) Driver License Division draws from each year. While the exact bank is not published, every question is sourced from the General Knowledge chapter of the Alabama CDL handbook, which itself is derived from the FMCSA Model Commercial Driver's License Manual. That means studying our practice tests, reading the corresponding handbook chapter, and re-reading the parts you got wrong is genuinely the most efficient route to a first-time pass.

Most successful applicants follow a simple cycle: take the practice test cold, write down every question you missed, open the matching chapter of the official Alabama handbook, re-read the section that contains the right answer, then re-take the practice test 24 to 48 hours later. The 24-hour delay matters — sleep is when your brain commits new information to long-term memory, and CDL knowledge questions reward that kind of consolidated learning rather than cramming.

Pay particular attention to questions that include qualifier words like always, never, only, primary, or most. CDL test writers love to flip the right answer with a single qualifier. When two answer choices look almost identical, pay attention to the verb (is it must, should, or may?) and to any numbers (14 days, 100 air miles, 8 hours, 70/8 split). On endorsement tests in particular, watch for trick framing where a true statement about a different endorsement is offered as the "correct" answer to a question that is actually about General Knowledge.

Test-day logistics matter too. Bring photo ID, your Social Security card or birth certificate, your medical examiner's certificate (DOT card), and proof of state residency if you haven't already submitted those documents. The Alabama Law Enforcement Agency (ALEA) Driver License Division will not let you sit for the knowledge exam without your documentation, and most offices charge an additional fee for re-attempts. Arrive early — the wait at most CDL testing offices runs 30 to 60 minutes — and silence your phone before the exam begins.

Finally, keep your General Knowledge fundamentals sharp even when you're focused on the General Knowledge exam. Many states administer multiple knowledge tests in a single sitting, and questions on weight definitions (GVWR, GCWR, GAWR), stopping distance, and the pre-trip inspection routine show up across endorsements. If you're unsure on the basics, sit a fresh Alabama General Knowledge practice test before scheduling the real exam.

Next steps

Missed more than four questions? Re-read the General Knowledge study guide and the matching chapter in the official Alabama CDL handbook. Then come back and re-take the test. Once you can score 22 of 25 or higher on three runs in a row, you're in good shape to schedule the real exam at your local Alabama Law Enforcement Agency (ALEA) Driver License Division office.

Already comfortable with this endorsement? Drill another: AL Air Brakes · AL Combination Vehicles · AL Hazardous Materials · AL Passenger · AL School Bus · AL Tank Vehicle · AL Doubles / Triples

New to the CDL process in Alabama? Read How to apply for a CDL in Alabama for the document checklist and step-by-step timeline.