UT · GK Endorsement

Utah General Knowledge CDL Practice Test

Below are 25 exam-style questions for the Utah General Knowledge CDL knowledge test, modeled on the FMCSA-aligned content used by the Utah 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

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

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

Correct answer: A

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

Question 2 of 25

The proper following distance for a 60-foot truck traveling under 40 mph is at least:

A 6 seconds
B 10 seconds
C 1 second
D 4 seconds

Correct answer: A

Use one second per 10 feet of vehicle length below 40 mph: 60 ft / 10 = 6 seconds. Add one additional second above 40 mph.

Question 3 of 25

You may not drive a CMV with a blood-alcohol concentration of:

A 0.10% or higher
B 0.04% or higher
C 0.08% or higher
D Any detectable amount above 0.00%

Correct answer: B

0.04% is the regulatory limit for CMV operation. A detectable amount under that triggers an out-of-service order but is not necessarily a DUI conviction.

Question 4 of 25

To recover from a front-wheel skid, you should:

A Steer sharply in the opposite direction
B Release the brake, let the wheels turn freely, and let the vehicle slow down
C Brake hard immediately
D Accelerate

Correct answer: B

A front-wheel skid is usually caused by braking too hard. Release the brake to allow the front tires to grip again so steering returns.

Question 5 of 25

A controlled braking technique means:

A Applying the brakes as hard as possible without locking the wheels
B Coasting in neutral
C Locking the wheels
D Pumping the brakes hard and fast

Correct answer: A

Controlled braking applies brakes hard but stops short of wheel lock-up. With ABS, you can simply press and hold full pressure.

Question 6 of 25

On a long downgrade, why is it dangerous to use the brakes too much?

A It triggers the ABS warning light
B It cools the brakes too much
C Brake fade can leave you with reduced or no braking power
D It wastes brake pads

Correct answer: C

Heat from continuous braking causes the friction surfaces to lose their grip. Use a low gear and brief, moderate brake applications.

Question 7 of 25

When should you do an en-route inspection?

A Only when the load is hazardous
B Within the first 25 miles, then about every 150 miles or every 3 hours
C At the end of the trip
D Only if a warning light comes on

Correct answer: B

The FMCSA model manual recommends a check within the first 25 miles to catch loose cargo or under-inflated tires that have warmed up, then about every 150 miles or 3 hours, and any time you stop.

Question 8 of 25

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

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

Correct answer: B

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

Stopping distance is made up of:

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

Correct answer: D

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

Question 10 of 25

The minimum tread depth for steer-axle tires is:

A 2/32 inch
B 4/32 inch
C 6/32 inch
D 1/32 inch

Correct answer: B

Steer tires must have at least 4/32 inch in every major groove. Other tires require at least 2/32 inch.

Question 11 of 25

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

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

Correct answer: C

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 12 of 25

Which is true about driving in mountains?

A Brakes alone are not designed to hold a heavy vehicle on a long downgrade
B Heavy vehicles can slow down sharply on grades
C All of the above
D Engine braking helps keep speed under control

Correct answer: C

Mountain driving combines all three. Use of low gears, engine braking, and short, moderate service-brake applications is the safe combination.

Question 13 of 25

Skids are most often caused by:

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

Correct answer: C

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 14 of 25

How does ABS help in an emergency stop?

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

Correct answer: A

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

Question 15 of 25

A driver who refuses to take a required drug or alcohol test is treated as if they:

A Took the test and failed
B Need to take it again later
C Did not take the test, with no consequence
D Took the test and passed

Correct answer: A

Refusal is a federal CDL disqualification with the same consequences as a positive test.

Question 16 of 25

You are driving a heavy vehicle and have to stop on a long downgrade. Which is the safest way?

A Use a low gear and steady moderate brake application
B Use the parking brake to slow down
C Pump the brakes hard and fast
D Disengage the clutch and coast

Correct answer: A

On a long downgrade, select a low gear before the descent and use steady, light to moderate braking. Hard pumping or coasting in neutral leads to brake fade and loss of control.

Question 17 of 25

Which is true about driving in rain?

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

Correct answer: D

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 18 of 25

What does it mean when a road sign says "Bridge formation may freeze before road"?

A Bridges are inspected only in winter
B The bridge is closed in winter
C Bridge surfaces freeze first because of air circulation underneath
D The pavement under the bridge is reinforced

Correct answer: C

Cold air around bridges and overpasses cools the deck more quickly than the surrounding road, which is why ice often appears there first.

Question 19 of 25

When you double your speed, your stopping distance approximately:

A Stays the same
B Triples
C Quadruples
D Doubles

Correct answer: C

Braking distance increases roughly with the square of speed; doubling speed quadruples the braking distance. Reaction distance only doubles, but the total grows quickly.

Question 20 of 25

What is the most important reason for doing a vehicle inspection?

A Safety for yourself and other road users
B To improve fuel economy
C To reduce tire wear
D To meet your dispatcher's schedule

Correct answer: A

Federal rules and the FMCSA model manual list safety as the single most important reason for a pre-trip inspection. Mechanical defects discovered before the trip cannot kill anyone on the highway.

Question 21 of 25

Which of the following is a sign of fatigue?

A Trouble remembering the last few miles
B Drifting in your lane
C Frequent yawning
D All of the above

Correct answer: D

All three are classic fatigue indicators in the FMCSA model. Cold air, music, and caffeine are not effective fixes — only sleep is.

Question 22 of 25

A leaking exhaust system is dangerous because:

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

Correct answer: B

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 23 of 25

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

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

Correct answer: D

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

Question 24 of 25

Which of the following is NOT part of a pre-trip inspection?

A Adjusting the trailer brakes individually
B Checking the engine compartment
C Testing the service and parking brakes
D Walking around the vehicle and checking lights

Correct answer: A

Adjusting brakes is a maintenance task done by qualified personnel, not a pre-trip step. The driver checks for proper operation, not adjustment.

Question 25 of 25

The most important hand position on the steering wheel is:

A 10 and 2 (or 9 and 3)
B One hand at 12
C Both hands at the bottom
D 12 and 6

Correct answer: A

A balanced grip at 10-and-2 or 9-and-3 gives the most control. One-handed and bottom-of-wheel positions reduce reaction time.

Study tips for the Utah General Knowledge exam

The General Knowledge portion of the Utah CDL exam is graded out of the bank of questions the Utah 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 Utah 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 Utah 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 Utah 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 Utah 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 Utah 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 Utah Driver License Division office.

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

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