FREE MS CDL Combination Test - Practice Test 2024

1. If you must drive slowly, how should you alert following drivers?

Turn on your taillights
Flash your brake lights
Use your emergency flashers if it is legal
Help them out by signaling when it is safe to pass

2. 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.

50 psi
100 psi
35 psi
150 psi

3. To prevent rollover, you should:

drive in the left lane.
turn the engine off while turning.
drive slowly around corners.
drive on the shoulder of the road when possible.

4. When the wheels of a trailer lock up, the trailer will tend to swing around. This is more likely to happen when:

the trailer is empty or lightly loaded.
the trailer is fully loaded.
the trailer is overloaded.
None of the above.

5. You are coupling a semi-trailer to your tractor but have not yet backed under. The trailer is at the right height when:

the locking jaws are around the head of the kingpin.
the end of the kingpin is even with the top of the fifth wheel.
it will be raised slightly when the tractor is backed under it.
None of the above.

6. Most hydraulic brake failures occur for one of two reasons, one of which is:

driving in cold weather.
relying too much on the engine braking effect.
excessive downshifting.
loss of hydraulic pressure.

7. To avoid rollbacks when you start, you should:

release the parking brake only when you have applied enough engine power.
put on the parking brake whenever necessary.
if you have manual transmission, partly engage the clutch before you take your right foot off the brake.
All of the above.

8. Before starting down a hill, you should:

slow down and shift to a lower gear.
release the accelerator and shift to Neutral at the same time.
apply the brakes hard.
look for an escape route.

9. If a drawbridge does not have a signal light or traffic control attendant, you should:

get through the drawbridge as quickly as possible.
stop and look to make sure the draw is completely closed before crossing.
drive through the drawbridge with caution.
stop at least 5 feet before the draw of the bridge.

10. Which of the following may have reduced the clearances since the heights were posted at bridges and overpasses?

Traffic
Repaving of the road
Rain
The weight of a cargo

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

MISSISSIPPI CDL COMBINATION PRACTICE TEST

CDL Combination Test (MS)