Alabama CDL Knowledge Test Class B: Practice Test - Practice Test 2
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When pulled off on the side of the road, a driver should:
Keep the driver's side door open.
Turn on their emergency flashers.
Wave their arms.
Turn off all lights.
Bridges usually:
Do not freeze.
Have heaters to prevent them from freezing.
Freeze before other surfaces.
In a dual air brake system:
Each system has separate air tanks, hoses, and lines.
The systems share air tanks, but each has its own separate hoses and lines.
Each system uses the same lines and hoses.
One system is the main braking system and a second system is ready to be used if the first one fails.
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
To change lanes, you should:
Move quickly.
Move slowly and smoothly.
Hold down your horn.
A tread depth of ____ should be in every major groove of a tire that is not in the front of a commercial motor vehicle.
1/32 of an inch
2/32 of an inch
4/32 of an inch
Containerized loads are used:
When the cargo is too large to fit on a truck.
When the cargo has been or will be transported by a train.
When the cargo is a liquid.
After an accident, flares should be used with caution because:
There may be fuel spilled on the ground that could catch fire.
Other drivers may not see the flares if the weather is sunny.
Flares are expensive.
When driving in fog, you should:
Slow down.
Speed up.
Drive on the shoulder.
To ensure that you do not slow down traffic when driving a large truck, you should:
Switch gears while driving uphill.
Try to pass another vehicle while driving uphill.
Stay in the right lane whenever possible.
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