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Driving Test
Idaho
Idaho CDL Air Brakes 2
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Q.1
Submit
If the low air pressure warning signal comes on in a vehicle with air brakes, the driver should:
Test the brakes while driving, but continue driving if nothing seems wrong.
Immediately stop driving.
Drive with the hazard lights activated.
Q.2
Submit
What does an air compressor do in an air brake system?
It pumps air into the air storage tanks.
It fills the tires.
It moves air to the back of the truck.
Q.3
Submit
Alcohol evaporators are:
Illegal.
Used to add alcohol to braking systems to prevent items from freezing.
Only allowed on vehicles carrying hazardous materials.
Q.4
Submit
The rods in S-cam brakes move the slack adjusters when air pressure is added to the brake chambers. This air pressure is added to the chambers when the driver:
Presses the brake pedal.
Uses the emergency brake.
Uses the trailer hand valve.
Q.5
Submit
You should test the low pressure warning signal by:
Turning on the engine and applying the trailer hand brake.
Rapidly pressing and releasing the brake pedal.
Removing wheel chocks and disengaging the parking brake.
Q.6
Submit
Air brakes use ____ to function.
Compressed air
Liquid air
Nitrogen
Q.7
Submit
A low air pressure warning signal should activate:
When tank pressure falls below 120 psi.
When tank pressure falls below 60 psi.
When tank pressure falls below 10 psi.
Q.8
Submit
A safety valve is set to open at ____ pounds per square inch (psi).
100
150
200
Q.9
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.10
Submit
What helps prevent wheel lockup when braking?
An Anti-Lock Braking System (ABS)
Air brakes
An alternator
Q.11
Submit
In a dual air brake system, air pressure should build from 85 to 100 psi within ____ seconds.
25
10
45
Q.12
Submit
When leaving your vehicle unattended:
The parking brake should be used.
The parking brake only needs to be used if the vehicle is parked on a slope.
The parking brake should not be used, as it can damage the tires.
Q.13
Submit
Air tank drains should:
Only be used by mechanics.
Only be used when it is wet outside.
Be used to drain the tanks completely.
Q.14
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.15
Submit
If an air compressor is belt-driven, the belt should be routinely checked to ensure that it is:
Thin.
Properly tightened.
Cracked.
Q.16
Submit
Air storage tanks:
Are not allowed on a vehicle.
Hold compressed air for the brakes.
Should be drained of excess air after every trip.
Q.17
Submit
Brake linings should be:
Loose.
Free of oil.
Soft.
Q.18
Submit
How much distance will an air brake-equipped vehicle need to come to a complete stop if it is traveling at 55 mph under ideal driving conditions?
300 feet
100 feet
450 feet
Q.19
Submit
Using the brakes creates heat. If too much heat is produced:
The brakes may not work.
The brakes may squeak more than usual.
The brakes will brake unevenly.
Q.20
Submit
An alcohol evaporator in an air brake system:
Makes the brakes work without squeaking.
Prevents ice from forming in the braking system.
Lubricates parts of the braking system.
Q.21
Submit
The leakage rate for a single vehicle with air brakes should be no more than ____ in one minute during a static leakage test.
1 psi
2 psi
3 psi
Q.22
Submit
When you are about to start down a hill, you should switch into a ____ gear.
Higher
Faster
Lower
Q.23
Submit
Air pressure should build up in a single air system within:
15 minutes.
12 minutes.
Three minutes.
Q.24
Submit
Having ABS on only one axle:
Can be dangerous.
Still allows you additional control when braking.
Slows the vehicle, but cannot stop it.
Q.25
Submit
Before driving a vehicle with air brakes, you should ensure that the ____ come on automatically when air pressure falls below 45 psi.
Spring brakes
Parking brakes
Air brakes
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