FREE SC CDL Doubles Triples Practice Test (2024)

1. Doubles/triples are:

easier to drive than other CMVs.
more stable than other CMVs.
less stable than other CMVs.
usually faster than most CMVs.

2. In vehicles with air brakes, the two markings on a front brake limiting valve are:

3. Emergency equipment is:

optional.
encouraged.
only required when transporting hazardous materials.
required.

4. In a dual air brake system, if one air system is very low on pressure:

either the front or rear brakes will not be operating fully.
you should pump the brakes to restore pressure.
you should drive and brake as you always have.
the effect won't be noticeable for the first 50 miles.

5. If driving a heavy vehicle, you should:

stay in the left lane.
avoid braking.
try to pass other vehicles going uphill.
stay in the right lane.

6. The application pressure gauge:

stops the compressor from pumping air.
shows how much air pressure is being applied to the brakes.
protects the tank and the rest of the system from too much pressure.
tells you how much pressure is in the air tanks.

7. Do NOT use the parking brakes:

to test that they work.
if the brakes are very hot.
when you leave your vehicle.
when you park for less than two hours.

8. If the drive wheels begin to spin, you should:

apply your brakes all the way.
wait 4-5 seconds before applying the accelerator.
accelerate smoothly and change gears as necessary.
take your foot off the accelerator.

9. Your vehicle has air brakes. To stop, you should:

pump the brake pedal 3 times.
pull the parking brake control knob out.
release the accelerator, push in the clutch, and shift to Neutral at the same time.
push the brake pedal down.

10. When you see you will need to slow down, you can warn drivers behind you by:

turning on the right turn signal.
slamming on the brakes.
making gestures.
tapping the brakes a few times.

SOUTH CAROLINA DOUBLES TRIPLES PRACTICE CDL TEST