Test 1 Flashcards
After uncoupling, the power line should be
upside down to prevent water from getting inside
If you are backing up your tractor under a trailer
the trailer should lift up slightly when you are backing underneath it
What is the purpose of the emergency line
it controls the emergency brakes on a combo vehicle
What is the proper procedure for backing under a trailer
in the lowest reverse gear
The following applies to the air valves if you are testing the trailer spring and parking brakes
the service and parking brake should be off, trailer supply out, and the trolley released
When testing the trailer protection valve it should
pop out and go from normal to emergency
A jackknife situation is more likely to occur
when the trailer is empty
If the fifth wheel locking lever does not engage around the king pin
it is not properly connected and should be corrected before driving off
The emergency line is
red
What is the proper procedure for checking the trailer connection?
slowly move forward and then inspect the coupling
The hand valve should be used when parking in the following situation
never - the hand or trolley valve is designed to test the brakes
The following can help prevent a rollover:
make sure the load is properly secured and by reducing speed around turns
What is the proper procedure should your vehicle become stuck on the railroad tracks
leave the vehicle immediately and notify 911 or the emergency number posted near the tracks
Using the trailer brakes to straighten it out
should not be done since it was usually caused by the trailer brakes - locking up the trailer braes can cause the vehicle to skid
How do you supply air to the trailer tanks
push in the trailer supply valve
The locking jaws should lock around the kingpin
shank
If the emergency air line to the trailer loses pressure it will
activate the trailer’s emergency brakes
The trailer’s air tanks are supplied by
opening the trailer’s supply valve
If you are backing your tractor under a trailer, the following should occur:
the trailer should rise off the ground slightly
After pushing in the trailer air supply valve you should not drive off until the pressure reaches
between 90 and 120 psi
During an inspection of a tractor and trailer, the ______ should be properly secure and free from damage or leaks?
the glad hands
What color is the service line
blue
You should always do the following before uncoupling a trailer:
make sure the surface is level and capable of supporting the weight of the trailer
In relation to a bus a straight truck, combo vehicles have
more things to inspect
The following is the correct procedure for testing the trailer brakes
release the service and parking brake, open the trailer air supply, and then apply the trolley brake
When should you use the trailer hand brake when driving?
it should not be used when you are driving
When completing coupling the fifth wheel safety catch on the fifth wheel locking lever will be
over the locking lever
