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North Dakota CDL Air Brakes Test 1
Practice mode
Question
1
of 25
QUESTION 1 / 25
A one-way check valve:
Choose one answer below.
A
Drains the water and compressor oil from the air tanks.
✓
B
Prevents air from escaping if the air compressor has a leak.
✓
C
Activates the emergency brakes when there is a leak.
✓
D
Holds the spring brakes in position until they are used.
✓
QUESTION 2 / 25
During a walk-around inspection, ensure there are no cracks on the brake drums that are more than ____ of the width of the friction area.
Choose one answer below.
A
One half
✓
B
One quarter
✓
C
One third
✓
D
One tenth
✓
QUESTION 3 / 25
If the low pressure warning light comes on while you are driving:
Choose one answer below.
A
Braking will only occur if there is enough air in the tanks.
✓
B
You can brake 14 times before the air in the system runs out.
✓
C
You should continue to drive normally and check the brake system when it is convenient.
✓
D
You should continue driving, but turn the emergency flashers on to warn other motorists.
✓
QUESTION 4 / 25
The air entering air storage tanks may contain:
Choose one answer below.
A
Water and compressor oil.
✓
B
Frost.
✓
C
Gravel.
✓
D
Antifreeze.
✓
QUESTION 5 / 25
Before driving a vehicle with a dual air brake system, you must wait for the air compressor to build a minimum of ____ in both the primary and secondary systems.
Choose one answer below.
A
25 psi
✓
B
50 psi
✓
C
75 psi
✓
D
100 psi
✓
QUESTION 6 / 25
If one air system in a dual air brake system is very low on pressure:
Choose one answer below.
A
None of the brakes will work at all.
✓
B
Either the front or rear brakes will not be operating fully.
✓
C
There will be no noticeable affect.
✓
D
Lights on the outside of the tractor will flash.
✓
QUESTION 7 / 25
At what psi is the safety valve set to open?
Choose one answer below.
A
100 psi
✓
B
150 psi
✓
C
200 psi
✓
D
500 psi
✓
QUESTION 8 / 25
If the air pressure warning light comes on, you should:
Choose one answer below.
A
Continue to drive normally.
✓
B
Drive with one foot on the accelerator and one foot on the brake pedal.
✓
C
Call the local law enforcement agency.
✓
D
Safely exit the roadway and stop.
✓
QUESTION 9 / 25
To make a stop in a vehicle using air brakes, the driver should:
Choose one answer below.
A
Press down the brake pedal.
✓
B
Lift the brake pedal toward them.
✓
C
Push in the brake knob.
✓
D
Pull out the brake knob.
✓
QUESTION 10 / 25
A vehicle equipped with an Anti-Lock Braking System (ABS) uses a ____ light to warn that the system is not working properly.
Choose one answer below.
A
Green
✓
B
Yellow
✓
C
Orange
✓
D
White
✓
QUESTION 11 / 25
A tank endorsement is:
Choose one answer below.
A
Only required when transporting gases.
✓
B
Only required when transporting liquids.
✓
C
Required when transporting both liquids and gases.
✓
D
Optional when transporting hazardous materials.
✓
QUESTION 12 / 25
Both systems in a dual air brake systems share:
Choose one answer below.
A
Air tanks.
✓
B
Hoses.
✓
C
Air lines.
✓
D
An air compressor.
✓
QUESTION 13 / 25
In a dual air brake system, a leak in one system:
Choose one answer below.
A
Always means there are leaks in both systems.
✓
B
May not affect the other system.
✓
C
Is not something to worry about.
✓
D
Will also affect the other system.
✓
QUESTION 14 / 25
The ____ tells a driver how much pressure is in the air tanks.
Choose one answer below.
A
Application pressure gauge
✓
B
Air compressor governor
✓
C
Supply pressure gauge
✓
D
Drum brake
✓
QUESTION 15 / 25
Where is the safety relief valve usually located?
Choose one answer below.
A
Near the rear brake
✓
B
Near the front brake
✓
C
In an air tank
✓
D
On the dashboard
✓
QUESTION 16 / 25
What should happen if the air pressure in the air brake system tanks falls below 60 psi?
Choose one answer below.
A
A warning light should come on.
✓
B
Lights should flash on the outside of the vehicle.
✓
C
A message should appear on the control panel.
✓
D
The vehicle should stop.
✓
QUESTION 17 / 25
An Anti-Lock Braking System (ABS):
Choose one answer below.
A
Cannot be used with air brakes.
✓
B
Should be used on dry pavement.
✓
C
Can assist in maintaining control when braking.
✓
D
Should only be used if all axles have ABS.
✓
QUESTION 18 / 25
If a vehicle has air brakes, the air compressor drive belt should be checked before each drive. In what condition should the belt be?
Choose one answer below.
A
Loose
✓
B
Tight
✓
C
Cracked
✓
D
Bumpy
✓
QUESTION 19 / 25
Air tank drains:
Choose one answer below.
A
Allow rain water to enter the tank.
✓
B
Are used to drain water and compressor oil from the air tank.
✓
C
Should never be opened.
✓
D
Must remain open during transit.
✓
QUESTION 20 / 25
The air storage tanks:
Choose one answer below.
A
Hold only enough air for one braking cycle.
✓
B
Hold enough air for brakes to be used several times if the compressor stops working.
✓
C
Do not hold air unless there is an emergency.
✓
D
Hold enough air for more than 1,000 braking cycles.
✓
QUESTION 21 / 25
The air compressor governor controls:
Choose one answer below.
A
When the air compressor pumps air into the air storage tanks.
✓
B
How fast air is pumped into the air storage tanks.
✓
C
The temperature of air pumped into the air storage tanks.
✓
D
The speed of the vehicle.
✓
QUESTION 22 / 25
Brake fade is a result of:
Choose one answer below.
A
Exposure to sunlight.
✓
B
Exposure to moisture.
✓
C
Excessive use.
✓
D
Not using the brakes enough.
✓
QUESTION 23 / 25
Most heavy-duty vehicles use:
Choose one answer below.
A
Mono air brake systems.
✓
B
Dual air brake systems.
✓
C
Triple air brake systems.
✓
D
Quadruple air brake systems.
✓
QUESTION 24 / 25
To inspect slack adjusters on S-cam brakes, you need to:
Choose one answer below.
A
Park on a hill and test the brakes.
✓
B
Put on gloves and push in the slack adjusters.
✓
C
Remove the drum and look inside.
✓
D
Chock the wheels and disengage the parking brake.
✓
QUESTION 25 / 25
The brake pedal is part of which braking system?
Choose one answer below.
A
The service brake system
✓
B
The parking brake system
✓
C
The emergency brake system
✓
D
The auxiliary brake system
✓
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