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Driving Test
Oklahoma
Oklahoma CDL Air Brakes 2
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Q.1
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When you are about to start down a hill, you should switch into a ____ gear.
Higher
Faster
Lower
Q.2
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A safety valve is set to open at ____ pounds per square inch (psi).
100
150
200
Q.3
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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.4
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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
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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.6
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Why do large vehicles use air brakes?
Other brake systems squeak too loudly.
Air brakes are very effective systems.
Other braking systems are hard to come by.
Q.7
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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.8
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Vehicles equipped with Anti-Lock Braking Systems (ABS) have ____ malfunction lamps to indicate when the ABS is not working.
Green
Blue
Yellow
Q.9
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Having ABS on only one axle:
Can be dangerous.
Still allows you additional control when braking.
Slows the vehicle, but cannot stop it.
Q.10
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Air tank drains:
Should not be used in cold weather.
Are helpful to remove water and oil from the air tanks.
Are used to move air to the brakes.
Q.11
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Air tank drains should:
Not be used by the driver.
Only be used when it is wet outside.
Be used to drain the tanks completely.
Q.12
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A low air pressure warning signal:
Is not recommended on vehicles with air brakes.
Is required on vehicles with air brakes.
Is optional on vehicles with air brakes.
Q.13
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Some water and compressor oil is usually found in the compressed air within an air brake system. The water and compressor oil:
Are necessary for the proper function of the system.
Should take up about 10 percent of the tank.
Should be removed regularly.
Q.14
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Brake fade is a result of:
Brakes being exposed to sunlight.
Brakes being exposed to moisture.
Excessive use of the brakes.
Q.15
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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.16
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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
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Foundation brakes are used:
Only on the front wheels of a vehicle.
Only on the rear wheels of a vehicle.
On each wheel of a vehicle.
Q.18
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Lights that indicate that anti-lock brakes are not working are:
Gray.
Blue.
Yellow.
Q.19
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An emergency brake must be controlled by:
Mechanical force.
Air pressure.
Gravity.
Q.20
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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.21
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When experiencing cold weather, be sure to check your vehicle's alcohol evaporator:
Every three hours.
Every day.
Every other week.
Q.22
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If the low air pressure warning signal comes on, you should:
Continue driving, but have the brakes repaired within a week.
Pull over and inspect the brakes.
Phone a mechanic while driving.
Q.23
Submit
What is often found in compressed air?
Water
Cardboard
Brake fluid
Q.24
Submit
If an air compressor is belt-driven, the belt should be routinely checked to ensure that it is:
Thin.
Properly tightened.
Cracked.
Q.25
Submit
What is brake lag?
The time required for the brakes to work after the brake pedal is pressed
The distance between the brake pedal and the floor
The amount of air pressure used to stop the vehicle
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