Permit CDL Tests
1 / 50
The brake pedal in an air brake system:
2 / 50
When driving at night, you should:
3 / 50
Which of these statements about backing a heavy vehicle is true?
4 / 50
The tractor protection valve will close, and the trailer emergency brakes will come on when there is a major leak in the _________ brake line.
5 / 50
If the service line comes apart while you are driving a combination vehicle but the emergency line stays together, what will happen right away?
6 / 50
An air brake system is fully charged at what PSI?
7 / 50
Which of these statements about using turn signals is true?
8 / 50
During normal driving, spring brakes are usually held back by:
9 / 50
What keeps an engine cool in hot weather driving
10 / 50
When brakes are applied the brake shoes will align to press against the:
11 / 50
Most serious skid results from:
12 / 50
What is counter-steering?
13 / 50
For your safety, when setting out reflective triangles you should:
14 / 50
When connecting the glad hands, you need to press the two seals with the couple together at what degree to each other?
15 / 50
As the blood alcohol concentration (BAC) goes up, what happens
16 / 50
You should always turn on your emergency four-way flashers when you:
17 / 50
There are two things that a driver can do to prevent a rollover. They are: (1) keep the cargo as close to the ground as possible, and (2):
18 / 50
To avoid an accident you moved to the shoulder. What should you do to return to the road?
19 / 50
The proper use of the brake when going down a long steep grade after selection a proper gear is to brake until your speed is above ___ MPH below the posted speed for safety and release you brake.
20 / 50
If your brakes fail on a downhill, first you must:
21 / 50
You have a major leak in the service line, and you put on brakes. Service air will escape and cause the
22 / 50
If you cannot make a turn without entering another traffic lane:
23 / 50
When checking the trailer emergency brakes, the tractor protection control valve should be placed in what position?
24 / 50
How do you correct a rear-wheels acceleration skid?
25 / 50
Which of these statements about a hazard of the vehicle fire is true?
26 / 50
You are driving on a straight level highway at 50 mph. There are no vehicles in front of you. Suddenly a tire blows out on your vehicle. What should you do first?
27 / 50
When driving a set of doubles, it is necessary to close which shut-off valve in the last trailer?
28 / 50
Which of these tell you that the shipment contains hazardous materials?
29 / 50
Which of these would not help if windshield covered with ice?
30 / 50
Before you back under the trailer, make sure that:
31 / 50
After you supply air to the trailer, make sure the air lines are not crossed, and the trailer brakes are working. This is done by:
32 / 50
When backing a tractor under a trailer, you should:
33 / 50
According to the driver's manual, why you should limit the use of your horn?
34 / 50
The air compressor governor controls:
35 / 50
The most common type for foundation brake found on the heavy vehicle is the:
36 / 50
You are coupling a tractor to a semitrailer and have backed up but are not under it. What should you hook before back under?
37 / 50
Sometimes you need to leave a road to avoid a hazard or an emergency. When you do so you should keep in mind that:
38 / 50
When loading a trailer if the load is loaded all to the rear, it may result in:
39 / 50
Which of these is NOT a danger when an automatic transmission is forced into a low gear at a high speed?
40 / 50
You are driving a 40-feet vehicle at 55 mph. The road is dry, and visibility is good. What is the least amount of space that you need to have in front of your vehicle to be safe?
41 / 50
Modern air brake systems combine three different systems. They are the service, the _________ brakes.
42 / 50
You are driving a long vehicle that makes wide turns. You want to turn left from Pine Street on to Cedar Street. Both are two-lane two-way streets. You should:
43 / 50
What is the proper way to hold a steering wheel?
44 / 50
When is it OK to leave your truck unattended without applying the parking brakes and choking the wheels?
45 / 50
If a coolant container is a part of the pressurized system, which of these is true:
46 / 50
Stab braking should not be used on a vehicle with:
47 / 50
If you must make an emergency stop, you should brake so you:
48 / 50
When driving through a work zone, you should:
49 / 50
Which of these would tell you that a shipment contains hazardous materials?
50 / 50
Your vehicle is in a traffic emergency and may collide with another vehicle if you do not take action. Which of these is a good rule to remember at such a time?
Your score is
The average score is 70%