1.
Passive railroad crossings:
should never be crossed using a CMV.
|
|
have at least one traffic control device.
|
|
do not have traffic control devices.
|
2.
You should check air pressure and temperature gauges:
at the end of each trip.
|
|
as often as is practical.
|
|
at the beginning of each trip.
|
3.
How do you check that spring brakes come on automatically?
Continue to step on and off the brake pedal until the air pressure falls to the manufacturer’s specification.
|
|
On a tractor-trailer combination vehicle, continue to step on and off the brake pedal until the tractor protection valve and the parking brake valve close.
|
|
All of the above.
|
4.
The __________ keeps air from going out if the air compressor develops a leak.
emergency relay valve
|
|
one-way check valve
|
|
tractor protection valve
|
5.
Empty trucks have the best braking. True or False?
True.
|
|
False.
|
|
It depends on the cargo.
|
6.
If the low pressure warning signal doesn't work:
this could cause sudden emergency braking in a single-circuit air system.
|
|
you could lose air pressure and you would know it.
|
|
None of the above.
|
7.
Your vehicle has a dual air brake system. If one air system is very low on pressure, you should:
call your dispatcher or supervisor for instructions.
|
|
reduce your speed and check the low air pressure warning signal for the other system regularly.
|
|
bring the vehicle to a safe stop, and have the air brakes system fixed.
|
8.
Which of the following statements is true?
Poor cargo ventilation is a common cause of fire.
|
|
Carrying a properly charged and rated fire extinguisher will help prevent fires.
|
|
There is no way that short circuits due to damaged insulation can cause a vehicle fire.
|
9.
The safety relief valve is usually set to open at ____ psi.
75
|
|
50
|
|
150
|
10.
Air tank drains:
are used to remove water and oil from the air tanks.
|
|
should not be used in wet weather.
|
|
protect the tanks and the rest of the system from too much pressure.
|
Next page
NOT SURE YOU WILL PASS? GET CDL PREMIUM NOW! - Learn More
Rate This Free Test