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