This is our North Dakota 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
The most common type of foundation brakes are ______ brakes.
A
s-cam drum
B
shoe
C
disc
D
wedge
Question 2
Brake drums are:
A
all of these.
B
bolted securely to the wheels.
C
used to hold the brake shoes and linings.
D
located on either end of the vehicle's axles.
Question 3
The air storage tanks are used to hold ______.
A
compressed gas
B
oxygen and helium
C
compressed air
D
nitrogen and oxygen
Question 4
Vehicles equipped with air brakes are required to have a low air pressure warning signal. True or False?
A
False
B
True
Question 5
When should the air tanks be drained?
A
Before every trip.
B
Once a day.
C
Every 1,000 miles.
D
Once a week.
Question 6
When should the parking brake not be used?
A
When the temperature is below freezing.
B
When the air pressure is low.
C
When the brakes are hot.
D
When the combined weight of your truckload and vehicle exceeds five tons.
Question 7
The safety valve in the air compressor tank should open at ______ psi.
A
200
B
125
C
150
D
175
Question 8
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 9
Compressed air is let out of the system by ______.
A
activating the parking brake
B
activating the emergency brake
C
letting up on the brake pedal
D
pushing down on the brake pedal
Question 10
What will happen if your air compressor stops working?
A
You will still have some air pressure left in the air tanks.
B
Nothing will happen.
C
Your brakes will instantly lock up.
D
You will instantly lose braking power.
Question 11
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
None of these.
D
To let you know how much diesel fuel is in the vehicle.
Question 12
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
Pump the brake pedal hard until you come to a stop.
C
Safely bring the automobile to a stop while you still have control over the brakes.
D
Check your air pressure gauge and drive at highway speeds.
Question 13
Air tanks must be drained to:
A
prevent them from freezing during cold temperatures.
B
prevent someone from moving the vehicle.
C
completely empty air out of the tank.
D
drain oil and moisture from the tank.
Question 14
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 85 to 100 psi within 45 seconds.
C
When pressure increases from 50 to 75 psi within three minutes.
D
When the compressor shuts off between 70 to 90 psi.
Question 15
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, sixty
B
one, thirty
C
three, sixty
D
two, sixty
Question 16
What does it mean when the safety valve releases air?
A
All of these.
B
The air pressure has exceeded 150 psi.
C
Something is malfunctioning, and you should have the vehicle checked by a mechanic.
D
There is way too much air in the air compressor.
Question 17
In an air brake system, the air compressor pumps air into the ______.
A
hydraulic brakes
B
air tank drains
C
storage tanks
D
brake system
Question 18
What two substances usually found in compressed air are harmful to the brake system?
A
Dust and water.
B
Water and compressor oil.
C
Compressed air does not contain any of these substances.
D
Dust and compressor oil.
Question 19
Air brake systems are a combination of which three braking systems?
A
The parking brake system, service brake system, and emergency brake system.
B
The emergency brake system, parking brake system, and foundation brake system.
C
The service brake system, manual brake system, and disc brake system.
D
The disc brake system, drum brake system, and foundation brake system.
Question 20
The emergency brake system uses the ______ and the ______ to stop the vehicle during a brake system failure.
A
service brake, parking brake systems
B
disc brake, parking brake systems
C
service brake, emergency brake systems
D
disc brake, emergency brake systems
Question 21
Spring brakes are ______.
A
used for parking
B
the spring that is attached to the brake pedal
C
springs that press the brakes on to stop the vehicle if the air brakes leak out
D
specialized brakes only to be used during warm weather
Question 22
The ______ forces the brake ______ away from each other and against the inside of the brake drum.
A
pressure valve, boots
B
valve spring, shoes
C
coil, boots
D
s-cam, shoes
Question 23
Are front wheel brakes good under all conditions?
A
Only if they are disc brakes.
B
No.
C
Yes.
D
Only if they are drum brakes.
Question 24
The service brake system:
A
is only on automobiles with hydraulic brakes.
B
applies and releases the vehicle's brakes using the brake pedal.
C
is only found on automobiles with hydraulic brakes.
D
is known as an official vehicle inspection.
Question 25
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
evaporate any alcohol, which can damage the brake system
C
remove fuel from the air lines
D
remove oil from the air lines
Once you are finished, click the button below. Any items you have not completed will be marked incorrect.
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All done
"Dude, Go Back to Truck Driving School" because you FAILED!
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ad Truck Driver!"
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"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 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 2
The air storage tanks are used to hold ______.
A
compressed air
B
nitrogen and oxygen
C
oxygen and helium
D
compressed gas
Question 3
When should the air tanks be drained?
A
Once a week.
B
Before every trip.
C
Every 1,000 miles.
D
Once a day.
Question 4
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 the governor switch stops between 75 to 90 psi.
C
When pressure increases from 85 to 100 psi within 45 seconds.
D
When pressure increases from 50 to 75 psi within three minutes.
Question 5
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
safety valve.
C
governor.
D
air tank drain.
Question 6
What does it mean when the safety valve releases air?
A
All of these.
B
The air pressure has exceeded 150 psi.
C
Something is malfunctioning, and you should have the vehicle checked by a mechanic.
D
There is way too much air in the air compressor.
Question 7
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 water is in the air tank.
C
To let you know how much oxygen is in the air tanks.
D
None of these.
Question 8
Air tanks must be drained to:
A
prevent someone from moving the vehicle.
B
completely empty air out of the tank.
C
prevent them from freezing during cold temperatures.
D
drain oil and moisture from the tank.
Question 9
Vehicles equipped with air brakes are required to have a low air pressure warning signal. True or False?
A
False
B
True
Question 10
Brake drums are:
A
bolted securely to the wheels
B
all of these.
C
located on either end of the vehicle's axles.
D
used to hold the brake shoes and linings.
Question 11
Air brake systems are a combination of which three braking systems?
A
The parking brake system, service brake system, and emergency brake system.
B
The emergency brake system, parking brake system, and foundation brake system.
C
The disc brake system, drum brake system, and foundation brake system.
D
The service brake system, manual brake system, and disc brake system.
Question 12
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, sixty
B
one, thirty
C
two, sixty
D
three, sixty
Question 13
Spring brakes are ______.
A
the spring that is attached to the brake pedal
B
specialized brakes only to be used during warm weather
C
used for parking
D
springs that press the brakes on to stop the vehicle if the air brakes leak out
Question 14
The ______ forces the brake ______ away from each other and against the inside of the brake drum.
A
coil, boots
B
s-cam, shoes
C
pressure valve, boots
D
valve spring, shoes
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
evaporate any alcohol, which can damage the brake system
C
remove fuel from the air lines
D
remove oil from the air lines
Question 16
The most common type of foundation brakes are ______ brakes.
A
s-cam drum
B
shoe
C
disc
D
wedge
Question 17
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 18
The safety valve in the air compressor tank should open at ______ psi.
A
125
B
175
C
200
D
150
Question 19
In an air brake system, the air compressor pumps air into the ______.
A
brake system
B
air tank drains
C
storage tanks
D
hydraulic brakes
Question 20
Compressed air is let out of the system by ______.
A
activating the emergency brake
B
activating the parking brake
C
pushing down on the brake pedal
D
letting up on the brake pedal
Question 21
The emergency brake system uses the ______ and the ______ to stop the vehicle during a brake system failure.
A
service brake, parking brake systems
B
disc brake, emergency brake systems
C
disc brake, parking brake systems
D
service brake, emergency brake systems
Question 22
Are front wheel brakes good under all conditions?
A
Only if they are drum brakes.
B
Yes.
C
No.
D
Only if they are disc brakes.
Question 23
When should the parking brake not be used?
A
When the air pressure is low.
B
When the brakes are hot.
C
When the combined weight of your truckload and vehicle exceeds five tons.
D
When the temperature is below freezing.
Question 24
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
Check your air pressure gauge and drive at highway speeds.
C
Pump the brake pedal hard until you come to a stop.
D
Stay calm and wait for the air brakes to come on automatically.
Question 25
What two substances usually found in compressed air are harmful to the brake system?
A
Compressed air does not contain any of these substances.
B
Dust and compressor oil.
C
Dust and water.
D
Water and compressor oil.
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.
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List
→
Return
Shaded items are complete.
1
2
3
4
5
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8
9
10
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13
14
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16
17
18
19
20
21
22
23
24
25
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Question Details
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Hint
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minutes
seconds
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Answer Choice(s) Selected
Question Text
All done
"Dude, Go Back to Truck Driving School" because you FAILED!
