CDL Combination Test (2024) - FREE Minnesota Practice Test

1. Empty trucks:

require shorter stopping distances than fully-loaded trucks.
have better traction than fully-loaded trucks.
may have poor traction.
None of the above.

2. Tar in the road pavement rising to the road surface in very hot weather:

might get in your engine.
does not affect the road surface or driving conditions.
causes the road to become very slippery.
is very sticky and will slow down your vehicle.

3. What is a tractor jackknife?

When a drive-wheel skid lets the trailer push the towing vehicle sideways.
When the rear wheels of a trailer lock up, and the tractor swings around.
When the wheels of a trailer lock up, and the trailer swings around.
None of the above.

4. When the ______ closes, it stops any air from going out of the tractor.

5. When driving on slippery roads, you should NOT:

use the engine brake.
watch far enough ahead to keep a steady speed.
try to anticipate stops early.
go slowly.

6. What should you do if your vehicle gets stuck on the railroad tracks?

Call 911, then get out of the vehicle and away from the tracks.
Get out of the vehicle and away from the tracks as quickly as possible, then call 911.
Turn on the emergency flashers and call 911.
Stay inside the vehicle and call 911.

7. When you drive a tractor-trailer combination with ABS, you should:

always apply the brakes hard.
pump the brakes.
brake as you always have.
apply the trailer hand brake whe braking.

8. If your truck catches fire, the first thing you should do is to:

get off the vehicle, open the hood and start shooting foam to keep the engine cool.
get the vehicle off the road and park near other vehicles.
pull off the road and park in an open area.
pull into a service station and call for help.

9. You are coupling a tractor to a semi-trailer. After checking the trailer height but before supplying air to the trailer, you should:

connect the air lines to the trailer.
raise the front trailer supports.
lock the trailer brakes.
inspect the fifth-wheel.

10. Which of the following is NOT a way to determine if your trailer is equipped with ABS (antilock braking system)?

The letters "ABS" are printed on the side of the steering wheel.
It has yellow ABS malfunction lamps.
Wheel speed sensor wires are coming from the back of the brakes.
It was built after March 1, 1998.

COMBINATION PRACTICE TEST - MN CDL