This is our South 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!
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
application pressure gauge.
C
safety valve.
D
air tank drain.
Question 2
What is a good indication that your truck'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 3
The emergency brake system uses the ______ and the ______ to stop the vehicle during a brake system failure.
A
disc brake, emergency brake systems
B
disc brake, parking brake systems
C
service brake, parking brake systems
D
service brake, emergency brake systems
Question 4
Are front wheel brakes good under all conditions?
A
Only if they are disc brakes.
B
Yes.
C
No.
D
Only if they are drum brakes.
Question 5
Vehicles equipped with air brakes are required to have a low air pressure warning signal. True or False?
A
True
B
False
Question 6
The safety valve in the air compressor tank should open at ______ psi.
A
150
B
175
C
200
D
125
Question 7
What does it mean when the safety valve releases air?
A
All of these.
B
There is way too much air in the air compressor.
C
The air pressure has exceeded 150 psi.
D
Something is malfunctioning, and you should have the vehicle checked by a mechanic.
Question 8
What will happen if your air compressor stops working?
A
Your brakes will instantly lock up.
B
Nothing will happen.
C
You will instantly lose braking power.
D
You will still have some air pressure left in the air tanks.
Question 9
The service brake system:
A
applies and releases the vehicle's brakes using the brake pedal.
B
is only on automobiles with hydraulic brakes.
C
is only found on automobiles with hydraulic brakes.
D
is known as an official vehicle inspection.
Question 10
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 diesel fuel is in the vehicle.
C
To let you know how much water is in the air tank.
D
None of these.
Question 11
In an air brake system, the air compressor pumps air into the ______.
A
hydraulic brakes
B
air tank drains
C
brake system
D
storage tanks
Question 12
When should the parking brake not be used?
A
When the brakes are hot.
B
When the combined weight of your truckload and vehicle exceeds five tons.
C
When the temperature is below freezing.
D
When the air pressure is low.
Question 13
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
Water and compressor oil.
D
Dust and water.
Question 14
Spring brakes are ______.
A
the spring that is attached to the brake pedal
B
used for parking
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 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
two, sixty
B
three, sixty
C
one, sixty
D
one, thirty
Question 16
When should the air tanks be drained?
A
Once a day.
B
Before every trip.
C
Every 1,000 miles.
D
Once a week.
Question 17
The most common type of foundation brakes are ______ brakes.
A
disc
B
shoe
C
s-cam drum
D
wedge
Question 18
Brake drums are:
A
used to hold the brake shoes and linings.
B
located on either end of the vehicle's axles.
C
all of these.
D
bolted securely to the wheels.
Question 19
The ______ forces the brake ______ away from each other and against the inside of the brake drum.
A
s-cam, shoes
B
valve spring, shoes
C
coil, boots
D
pressure valve, boots
Question 20
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
reduce the risk of ice in the air brake valves
C
remove oil from the air lines
D
remove fuel from the air lines
Question 21
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
Pump the brake pedal hard until you come to a stop.
C
Check your air pressure gauge and drive at highway speeds.
D
Stay calm and wait for the air brakes to come on automatically.
Question 22
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 parking brake
D
activating the emergency brake
Question 23
The air storage tanks are used to hold ______.
A
compressed air
B
oxygen and helium
C
nitrogen and oxygen
D
compressed gas
Question 24
Air tanks must be drained to:
A
completely empty air out of the tank.
B
prevent someone from moving the vehicle.
C
drain oil and moisture from the tank.
D
prevent them from freezing during cold temperatures.
Question 25
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.
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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!