Free TN-CDL Practice Questions

Question 1

A 70-foot tractor-trailer is traveling at 50 mph in good, dry conditions. What is the minimum following interval under the CDL following-distance rule?

Accepted Answer

8 seconds

Answer

6 seconds

Answer

7 seconds

Answer

9 seconds

Question 2

Without warning, the right-front tire of a loaded tractor-trailer blows out at highway speed. Which response gives the driver the best chance of maintaining control?

Accepted Answer

Hold straight, avoid braking, ease off the accelerator, then brake gently once stable

Answer

Brake firmly at once while steering toward the shoulder

Answer

Accelerate briefly and steer quickly toward the shoulder before the tractor drifts

Answer

Downshift immediately and use engine braking before the vehicle has stabilized

Question 3

An unblocked, unbraced 16-foot machine weighs 8,000 pounds. Each tiedown is arranged so its full listed working load limit counts toward the aggregate. Which securement plan satisfies both the minimum tiedown count and the aggregate working-load-limit requirement?

Accepted Answer

Four tiedowns rated at 1,100 pounds each

Answer

Three tiedowns rated at 1,300 pounds each

Answer

Two tiedowns rated at 2,500 pounds each

Answer

Five tiedowns rated at 750 pounds each

Question 4

On a long downgrade, a driver has selected the proper low gear and established a safe speed of 40 mph. When the vehicle rises back to 40 mph, what should the driver do under the snub-braking method?

Accepted Answer

Brake to about 35 mph, release fully, and repeat when speed returns to 40 mph

Answer

Maintain light service-brake pressure continuously so the speed never varies from 40 mph

Answer

Shift to neutral and use intermittent hard service-brake applications

Answer

Wait until 45 mph, then make one long brake application down to 35 mph

Question 5

During a pre-trip inspection, every major groove on a steering-axle tire measures 3/32 inch. A drive-axle tire also measures 3/32 inch, and neither tire has other damage. Which assessment is correct?

Accepted Answer

The steering tire fails; the drive tire meets the tread-depth minimum

Answer

Both tires pass because every CMV tire uses a 2/32-inch minimum

Answer

Both tires fail because every CMV tire requires at least 4/32 inch

Answer

The drive tire fails; the steering tire passes because the 4/32-inch rule applies only to drive tires

Question 6

With its wheels chocked, a fully charged combination vehicle has the engine off, parking brakes released, and foot brake not applied. Air pressure drops 2.5 psi in one minute. What does this result mean?

Accepted Answer

It passes the static test; continue with the remaining air-brake checks

Answer

It fails because every vehicle is limited to 2 psi per minute

Answer

It fails because any air loss with the engine off requires repair before testing continues

Answer

It passes only if the foot brake is applied during the same minute

Question 7

While fanning the brakes on a fully charged combination vehicle, the low-air warning activates at 52 psi and the trailer-air-supply control pops out at 28 psi. Which part of the test failed?

Accepted Answer

Only the warning, because it activated after pressure fell below 55 psi

Answer

Neither part; both readings are within the expected ranges

Answer

Only the 28-psi pop-out, because the control must pop above 45 psi

Answer

Both parts, because the warning and pop-out must occur at the same pressure

Question 8

A tractor-semitrailer coupling passes the tug test, but direct inspection shows visible space between the trailer apron and the fifth wheel. What should the driver conclude?

Accepted Answer

The trailer is falsely coupled and must be uncoupled and recoupled before moving

Answer

The connection is acceptable because a successful tug test overrules the visible gap

Answer

The landing gear should be raised fully to pull the trailer down onto the fifth wheel

Answer

The rig may move slowly so the kingpin can settle into the fifth wheel

Question 9

A driver connects the red tractor glad hand to the trailer's blue coupling and the blue glad hand to the trailer's red coupling. On a modern spring-brake trailer, which result is most likely?

Accepted Answer

The trailer tanks may not charge, leaving the spring brakes applied

Answer

The tanks charge normally, but the foot brake cannot operate the trailer brakes

Answer

The spring brakes release normally, but the trailer ABS lamp stays on

Answer

The tractor loses its parking brakes as soon as the supply control is pushed in

Question 10

A driver is assembling a double. One loaded semitrailer has a gross weight of 18,000 pounds and the other 7,000 pounds. Which arrangement best controls stability?

Accepted Answer

Place the heavier trailer first, directly behind the tractor, and the lighter trailer last

Answer

Place the lighter trailer first so the tractor steering axle carries less load

Answer

Use either order as long as both trailers have equal tire pressure

Answer

Place the heavier trailer last and offset the placement by reducing speed on curves

Free TN-CDL Practice Questions

Domain 1: General Knowledge

Question 1

Question 2

Question 3

Question 4

Question 5

Domain 2: Air Brakes

Question 6

Question 7

Domain 3: Combination Vehicles

Question 8

Question 9

Domain 4: Hazardous Materials

Question 10

The rest of the TN-CDL blueprint

That's 10 of 1,030