CDL Combination Test (2024) - FREE Tennessee Practice Test

1. When approaching a stopped bus, you must be aware that:

passing a stopped bus is illegal.
passengers may cross in front of or behind the bus.
a student may be driving the bus.
passengers crossing in front of the bus can always see you.

2. When parking, you should choose a spot:

that requires backing up.
that allows you to pull forward when you leave.
that allows you do a walk around inspection.
All of the above.

3. When uncoupling a trailer, after shutting off the trailer air supply to lock the trailer brakes, you should:

immediately apply your tractor parking brakes.
pull the tractor forward until the fifth-wheel comes out from under the trailer.
inspect the trailer supports.
back up gently to ease the pressure on the fifth-wheel locking jaws.

4. If you discover a fire, before opening trailer doors you should:

feel the doors to see if they are hot.
have a helper open the doors.
use the fire extinguisher on the doors.
All of the above.

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

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

6. Containerized loads:

must be inspected before and after the trip.
should exceed gross weight and axle weight limits.
are generally used for freight carried part way by rail or ship.
All of the above.

7. Before driving a vehicle with a dual air brake system, you should allow time for the air compressor to build up a minimum of ____ pressure in both the primary and secondary systems.

150 psi
35 psi
50 psi
100 psi

8. Hydroplaning:

only occurs at extremely high speeds.
can occur at speeds as low as 30 mph.
only happens when tire pressure is higher than normal.
never occurs at speeds below 40 mph.

9. When driving a 50 foot combination vehicle at 50 mph in ideal conditions, you should keep at least ____ seconds of space in front of you.

4
10
6
5

10. The front trailer supports are up, and the trailer is resting on the tractor. Make sure:

there is enough clearance between the rear of the tractor frame and the landing gear.
there is enough clearance between the top of the tractor tires and the nose of the trailer.
the electrical and air connections are properly connected between the tractor and the trailer.
All of the above.

Number of questions:	20
Correct answers to pass:	16
Passing score:	80%

COMBINATION PRACTICE TEST - TN CDL

TN Combination Test