This is our North Carolina Air Brakes Practice Quiz and Practice Test compiled of 25 questions each. Each question is worth four points for a total of 100 possible points. A passing score is 80%.
The Air Brakes Practice Quiz reveals the correct answer during each question to help you study for the actual Air Brakes exam. The Air Brakes Practice Test doesn’t reveal the correct answers until the test is over.
The questions and answers are given in random order each time you retake the test. When you are finished testing, simply click on the “Get Results” button to see your test results. Clicking on the blue “List” button will reveal a list of all the questions you answered correctly and incorrectly. To take the test again, just refresh your browser window. It’s that easy.
Press the start button to begin your free Air Brakes Practice Quiz. Good luck!
Air Brakes CDL Practice Quiz
Start
Congratulations! You have completed the Air Brakes CDL Practice Quiz.
You scored %%SCORE%% out of %%TOTAL%%.
Your performance has been rated as %%RATING%%
Your answers are highlighted below.
Question 1
In a straight truck or passenger bus, with the engine off and the brakes released, air loss should not exceed ______ psi in ______ seconds.
A
three, sixty
B
two, sixty
C
one, sixty
D
one, thirty
Question 2
Vehicles equipped with air brakes are required to have a low air pressure warning signal. True or False?
A
False
B
True
Question 3
What does it mean when the safety valve releases air?
A
There is way too much air in the air compressor.
B
Something is malfunctioning, and you should have the vehicle checked by a mechanic.
C
The air pressure has exceeded 150 psi.
D
All of these.
Question 4
The air storage tanks are used to hold ______.
A
compressed gas
B
compressed air
C
nitrogen and oxygen
D
oxygen and helium
Question 5
Are front wheel brakes good under all conditions?
A
Yes.
B
Only if they are disc brakes.
C
Only if they are drum brakes.
D
No.
Question 6
What is a good indication that your truck's single brake system needs to be adjusted?
A
When the governor switch stops between 75 to 90 psi.
B
When pressure increases from 50 to 75 psi within three minutes.
C
When the compressor shuts off between 70 to 90 psi.
D
When pressure increases from 85 to 100 psi within 45 seconds.
Question 7
The supply pressure gauge is used for what purpose?
A
To let you know how much oxygen is in the air tanks.
B
To let you know how much water is in the air tank.
C
To let you know how much diesel fuel is in the vehicle.
D
None of these.
Question 8
When should the parking brake not be used?
A
When the air pressure is low.
B
When the temperature is below freezing.
C
When the brakes are hot.
D
When the combined weight of your truckload and vehicle exceeds five tons.
Question 9
When should the air tanks be drained?
A
Before every trip.
B
Once a week.
C
Once a day.
D
Every 1,000 miles.
Question 10
What should you do when you see the low pressure warning?
A
Safely bring the automobile to a stop while you still have control over the brakes.
B
Stay calm and wait for the air brakes to come on automatically.
C
Check your air pressure gauge and drive at highway speeds.
D
Pump the brake pedal hard until you come to a stop.
Question 11
Brake drums are:
A
located on either end of the vehicle's axles.
B
bolted securely to the wheels.
C
used to hold the brake shoes and linings.
D
all of these.
Question 12
The emergency brake system uses the ______ and the ______ to stop the vehicle during a brake system failure.
A
disc brake, parking brake systems
B
service brake, parking brake systems
C
disc brake, emergency brake systems
D
service brake, emergency brake systems
Question 13
What two substances usually found in compressed air are harmful to the brake system?
A
Water and compressor oil.
B
Compressed air does not contain any of these substances.
C
Dust and compressor oil.
D
Dust and water.
Question 14
What will happen if your air compressor stops working?
A
Your brakes will instantly lock up.
B
You will instantly lose braking power.
C
You will still have some air pressure left in the air tanks.
D
Nothing will happen.
Question 15
Some air brake systems are equipped with an alcohol evaporator. The purpose of the alcohol evaporator is to______.
A
reduce the risk of ice in the air brake valves
B
remove fuel from the air lines
C
evaporate any alcohol, which can damage the brake system
D
remove oil from the air lines
Question 16
The ______ forces the brake ______ away from each other and against the inside of the brake drum.
A
pressure valve, boots
B
s-cam, shoes
C
valve spring, shoes
D
coil, boots
Question 17
Air tanks must be drained to:
A
prevent someone from moving the vehicle.
B
prevent them from freezing during cold temperatures.
C
drain oil and moisture from the tank.
D
completely empty air out of the tank.
Question 18
The device that protects the tank and the rest of the air brake system from too much pressure is known as the:
A
governor.
B
air tank drain.
C
application pressure gauge.
D
safety valve.
Question 19
Air brake systems are a combination of which three braking systems?
A
The disc brake system, drum brake system, and foundation brake system.
B
The emergency brake system, parking brake system, and foundation brake system.
C
The parking brake system, service brake system, and emergency brake system.
D
The service brake system, manual brake system, and disc brake system.
Question 20
The service brake system:
A
is known as an official vehicle inspection.
B
is only found on automobiles with hydraulic brakes.
C
is only on automobiles with hydraulic brakes.
D
applies and releases the vehicle's brakes using the brake pedal.
Question 21
In an air brake system, the air compressor pumps air into the ______.
A
air tank drains
B
brake system
C
storage tanks
D
hydraulic brakes
Question 22
The most common type of foundation brakes are ______ brakes.
A
shoe
B
disc
C
s-cam drum
D
wedge
Question 23
The safety valve in the air compressor tank should open at ______ psi.
A
200
B
150
C
125
D
175
Question 24
Compressed air is let out of the system by ______.
A
letting up on the brake pedal
B
pushing down on the brake pedal
C
activating the emergency brake
D
activating the parking brake
Question 25
Spring brakes are ______.
A
used for parking
B
specialized brakes only to be used during warm weather
C
springs that press the brakes on to stop the vehicle if the air brakes leak out
D
the spring that is attached to the brake pedal
Once you are finished, click the button below. Any items you have not completed will be marked incorrect.
Get Results
There are 25 questions to complete.
←
List
→
Return
Shaded items are complete.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
End
Return
You have completed
questions
question
Your score is
Correct
Wrong
Partial-Credit
You have not finished your quiz. If you leave this page, your progress will be lost.
Correct Answer
You Selected
Not Attempted
Final Score on Quiz
Attempted Questions Correct
Attempted Questions Wrong
Questions Not Attempted
Total Questions on Quiz
Question Details
Results
Date
Score
Hint
Time allowed
minutes
seconds
Time used
Answer Choice(s) Selected
Question Text
All done
"Dude, Go Back to Truck Driving School" because you FAILED!
"A Bad Truck Driver" because you FAILED!
ad Truck Driver!"
"An Amateur Truck Driver" because you FAILED!
"A Good Truck Driver" because you PASSED!
"A Truck Driving Pro" because you PASSED!
Remember, the Air Brakes Practice Test doesn’t reveal the correct answers until the test is over. The questions and answers are given in random order each time you retake the test. When you are finished testing, simply click on the “Get Results” button to see your test results. Clicking on the blue “List” button will reveal a list of all the questions you answered correctly and incorrectly. To take the test again, just refresh your browser window.
Press the start button to begin your free Air Brakes Practice Test. Good luck!
Air Brakes CDL Practice Test
Start
Congratulations! You have completed the Air Brakes CDL Practice Test.
You scored %%SCORE%% out of %%TOTAL%%.
Your performance has been rated as %%RATING%%
Your answers are highlighted below.
Question 1
The ______ forces the brake ______ away from each other and against the inside of the brake drum.
A
valve spring, shoes
B
pressure valve, boots
C
s-cam, shoes
D
coil, boots
Question 2
Are front wheel brakes good under all conditions?
A
Yes.
B
Only if they are disc brakes.
C
Only if they are drum brakes.
D
No.
Question 3
What will happen if your air compressor stops working?
A
Your brakes will instantly lock up.
B
Nothing will happen.
C
You will still have some air pressure left in the air tanks.
D
You will instantly lose braking power.
Question 4
The safety valve in the air compressor tank should open at ______ psi.
A
200
B
150
C
125
D
175
Question 5
Brake drums are:
A
used to hold the brake shoes and linings.
B
bolted securely to the wheels
C
all of these.
D
located on either end of the vehicle's axles.
Question 6
Air brake systems are a combination of which three braking systems?
A
The disc brake system, drum brake system, and foundation brake system.
B
The service brake system, manual brake system, and disc brake system.
C
The parking brake system, service brake system, and emergency brake system.
D
The emergency brake system, parking brake system, and foundation brake system.
Question 7
The most common type of foundation brakes are ______ brakes.
A
wedge
B
shoe
C
disc
D
s-cam drum
Question 8
The emergency brake system uses the ______ and the ______ to stop the vehicle during a brake system failure.
A
service brake, parking brake systems
B
service brake, emergency brake systems
C
disc brake, emergency brake systems
D
disc brake, parking brake systems
Question 9
Compressed air is let out of the system by ______.
A
activating the emergency brake
B
letting up on the brake pedal
C
activating the parking brake
D
pushing down on the brake pedal
Question 10
Some air brake systems are equipped with an alcohol evaporator. The purpose of the alcohol evaporator is to______.
A
evaporate any alcohol, which can damage the brake system
B
remove oil from the air lines
C
reduce the risk of ice in the air brake valves
D
remove fuel from the air lines
Question 11
Air tanks must be drained to:
A
prevent them from freezing during cold temperatures.
B
drain oil and moisture from the tank.
C
completely empty air out of the tank.
D
prevent someone from moving the vehicle.
Question 12
What does it mean when the safety valve releases air?
A
Something is malfunctioning, and you should have the vehicle checked by a mechanic.
B
All of these.
C
There is way too much air in the air compressor.
D
The air pressure has exceeded 150 psi.
Question 13
In a straight truck or passenger bus, with the engine off and the brakes released, air loss should not exceed ______ psi in ______ seconds.
A
one, thirty
B
three, sixty
C
two, sixty
D
one, sixty
Question 14
In an air brake system, the air compressor pumps air into the ______.
A
air tank drains
B
hydraulic brakes
C
storage tanks
D
brake system
Question 15
The supply pressure gauge is used for what purpose?
A
To let you know how much diesel fuel is in the vehicle.
B
To let you know how much oxygen is in the air tanks.
C
To let you know how much water is in the air tank.
D
None of these.
Question 16
The air storage tanks are used to hold ______.
A
nitrogen and oxygen
B
compressed air
C
oxygen and helium
D
compressed gas
Question 17
Spring brakes are ______.
A
specialized brakes only to be used during warm weather
B
used for parking
C
springs that press the brakes on to stop the vehicle if the air brakes leak out
D
the spring that is attached to the brake pedal
Question 18
What should you do when you see the low pressure warning?
A
Stay calm and wait for the air brakes to come on automatically.
B
Check your air pressure gauge and drive at highway speeds.
C
Safely bring the automobile to a stop while you still have control over the brakes.
D
Pump the brake pedal hard until you come to a stop.
Question 19
The service brake system:
A
is only on automobiles with hydraulic brakes.
B
is only found on automobiles with hydraulic brakes.
C
applies and releases the vehicle's brakes using the brake pedal.
D
is known as an official vehicle inspection.
Question 20
What is a good indication that your automobile's single brake system needs to be adjusted?
A
When the compressor shuts off between 70 to 90 psi.
B
When pressure increases from 85 to 100 psi within 45 seconds.
C
When pressure increases from 50 to 75 psi within three minutes.
D
When the governor switch stops between 75 to 90 psi.
Question 21
What two substances usually found in compressed air are harmful to the brake system?
A
Dust and water.
B
Water and compressor oil.
C
Dust and compressor oil.
D
Compressed air does not contain any of these substances.
Question 22
Vehicles equipped with air brakes are required to have a low air pressure warning signal. True or False?
A
False
B
True
Question 23
The device that protects the tank and the rest of the air brake system from too much pressure is known as the:
A
application pressure gauge.
B
governor.
C
air tank drain.
D
safety valve.
Question 24
When should the parking brake not be used?
A
When the combined weight of your truckload and vehicle exceeds five tons.
B
When the temperature is below freezing.
C
When the brakes are hot.
D
When the air pressure is low.
Question 25
When should the air tanks be drained?
A
Once a day.
B
Before every trip.
C
Once a week.
D
Every 1,000 miles.
Once you are finished, click the button below. Any items you have not completed will be marked incorrect.
Get Results
There are 25 questions to complete.
←
List
→
Return
Shaded items are complete.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
End
Return
You have completed
questions
question
Your score is
Correct
Wrong
Partial-Credit
You have not finished your quiz. If you leave this page, your progress will be lost.
Correct Answer
You Selected
Not Attempted
Final Score on Quiz
Attempted Questions Correct
Attempted Questions Wrong
Questions Not Attempted
Total Questions on Quiz
Question Details
Results
Date
Score
Hint
Time allowed
minutes
seconds
Time used
Answer Choice(s) Selected
Question Text
All done
"Dude, Go Back to Truck Driving School" because you FAILED!
