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Driving Test
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Driving Test
Missouri
Missouri CDL Air Brakes 1
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Q.1
Submit
A safety valve is set to open at ____ pounds per square inch (psi).
100
150
200
Q.2
Submit
In a dual air brake system, air pressure should build from 85 to 100 psi within ____ seconds.
25
10
45
Q.3
Submit
A dual air brake system:
Consists of two separate air brake systems that share a single set of controls.
Is a single air brake system with two different sets of controls.
Consists of one air brake system for the left side of the truck and one system for the right side of the truck, each with its own set of controls.
Q.4
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.5
Submit
While driving, ____ generally holds spring brakes in place.
Air pressure
Electricity
Gasoline
Q.6
Submit
What helps prevent wheel lockup when braking?
An Anti-Lock Braking System (ABS)
Air brakes
An alternator
Q.7
Submit
Which of the following is not part of a vehicle’s air brake system?
Air gauges
Low pressure warning device
Air filter
Q.8
Submit
The air storage tanks:
Hold only enough air for one braking cycle.
Hold enough air for the brakes to be used several times if the compressor stops working.
Do not hold air unless there is an emergency.
Q.9
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.10
Submit
During an applied leakage test, the maximum leakage rate for a triple combination vehicle is ____ in a minute.
2 psi
4 psi
6 psi
Q.11
Submit
If air pressure drops to a level between ____, a visual low pressure warning signal should have already activated.
55 and 75 psi.
80 and 95 psi.
65 and 100 psi.
Q.12
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
Q.13
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.14
Submit
When parked on a flat surface, you should:
Use wheel chocks to prevent your vehicle from moving.
Not use wheel chocks.
Use wheel chocks, but only if you have applied the parking brake.
Q.15
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.
Q.16
Submit
Air brakes use ____ to function.
Compressed air
Liquid air
Nitrogen
Q.17
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When stopping in an emergency situation, you should:
Veer your trailer to the right and stop.
Stop in a straight line.
Veer your trailer to the left and stop.
Q.18
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.19
Submit
In a vehicle with dual parking control valves, a separate air tank can be used:
To make the air brakes work more effectively.
To temporarily release the spring brakes.
To charge the brakes on the rear trailer.
Q.20
Submit
When traveling down a steep downgrade:
The air brakes should be used.
The vehicle should be placed in a low gear and the driver should use engine braking.
The driver should continually downshift instead of using the brakes.
Q.21
Submit
If the safety relief valve in an air brake system is releasing air:
You should not be concerned as this is a normal process.
There is something wrong with the brakes.
The valve is operational.
Q.22
Submit
A slack adjuster should move no more than ____ from where it is attached to the push rod.
Two inches
Five inches
One inch
Q.23
Submit
You should ____ if the low pressure warning signal activates while you are driving.
Stop where you are and park
Exit the roadway as soon as safely possible
Continue driving normally
Q.24
Submit
A wig wag is:
A low pressure warning device.
A tube that carries air to the brakes.
A type of air brake system.
Q.25
Submit
Having ABS on only one axle:
Can be dangerous.
Still allows you additional control when braking.
Slows the vehicle, but cannot stop it.
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