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Alaska
Alaska CDL Air Brakes 1
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Q.1
Submit
What should happen before the air pressure in an air brake system tank falls below 55 psi?
The warning light should activate.
The vehicle will be unable to shift out of gear.
The front lights should flash.
Q.2
Submit
If the safety relief valve in the air brake system releases air:
The compressor needs more air.
The air pressure has become too high.
The brakes are fully operational.
Q.3
Submit
Air brakes use ____ to function.
Compressed air
Liquid nitrogen
Carbon dioxide
Q.4
Submit
If you are braking on dry pavement while traveling at 55 mph, how much distance will brake lag add to your overall stopping distance?
32 feet
45 feet
20 feet
Q.5
Submit
If the safety relief valve in the air brake system releases air:
The compressor needs more air.
There is something wrong with the brakes.
You may continue driving.
Q.6
Submit
____ make up the emergency brake system.
Only parts of the parking brake system
Only parts of the service brake system
Parts of the parking and service brake systems
Q.7
Submit
Truck tractors with air brakes built on or after March 1, 1997 must have:
An Anti-Lock Braking System (ABS).
Bluetooth.
A GPS.
Q.8
Submit
The ____ between an air compressor and reservoir tank prevents air from escaping if the air compressor has a leak.
Slack adjuster
One-way check valve
Tractor protection valve
Q.9
Submit
To make a stop in a vehicle equipped with air brakes, the driver should:
Press the brake pedal down.
Lift the brake pedal up.
Pull out the air brake knob.
Q.10
Submit
An emergency brake must be controlled by:
Mechanical force.
Air pressure.
Gravity.
Q.11
Submit
Some air brake systems introduce alcohol into the system to:
Make the brakes work without squeaking.
Prevent ice from forming in the brake system.
Prevent people from breathing the air from the system.
Q.12
Submit
You must have an air brake endorsement:
To use a vehicle with air brakes.
To drive any truck with a trailer.
To transport hazardous materials.
Q.13
Submit
An 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 the air pumped into the air storage tanks.
Q.14
Submit
Which of the following is not part of a vehicle’s air brake system?
Air gauges
Low pressure warning device
Air filter
Q.15
Submit
In a dual air brake system, if one air system is very low on pressure:
None of the brakes will work at all.
Either the front or rear brakes will not be fully operable.
There is usually no noticeable effect.
Q.16
Submit
What helps prevent wheel lockup when braking?
An Anti-Lock Braking System (ABS)
Air brakes
An alternator
Q.17
Submit
What kind of brakes do most newer heavy-duty trucks use?
Single air brakes
Dual air brakes
Triple air brakes
Q.18
Submit
The leakage rate for a triple combination vehicle with air brakes should be no more than ____ in one minute during a static leakage test.
8 psi
5 psi
3 psi
Q.19
Submit
What color malfunction lamps do vehicles equipped with ABS have?
Green
Yellow
Blue
Q.20
Submit
When parking, you should not use the parking brake if:
The brakes are very hot.
The brakes are very cold.
There is snow on the ground.
Q.21
Submit
While driving, ____ generally holds spring brakes in place.
Air pressure
Electricity
Gasoline
Q.22
Submit
When leaving your vehicle unattended:
The parking brake must be always be used.
The parking brake should never be used.
Windows in the cab should be lowered.
Q.23
Submit
When operating a vehicle with a dual air brake system, the driver should:
Let the vehicle warm up before driving to ensure that the fuel reaches the engine.
Let the air compressor build up a minimum of 100 psi pressure in the primary and secondary systems before driving.
Begin driving just after the vehicle starts.
Q.24
Submit
On flat surfaces, wheel chocks:
Can be used to prevent a parked vehicle from moving.
Make it easier for a parked vehicle to roll.
Should only be used on the front driver's side tire.
Q.25
Submit
To ensure normal stopping power, drivers of vehicles equipped with a front brake limiting valve should:
Set the control to normal.
Set the control to the off position.
Set the control to the neutral position.
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