This will test knowledge of Combination Vehicles.
At normal pressure
Bled down to half the maximum pressure
Between 60-80 psi
Empty
Trailer brakes are locked
Tractor protection valve is normal
Air brakes are off
Air supply knob is in
The kingpin is about 1 1/4" inches above the fifth wheel
The end of the kingpin is even with the top of the fifth wheel
It will be raised slightly when the tractor is backed under it
The trailer landing gear are fully extended
The electrical service cable
The emergency and service air lines
Nothing. Back up and lock the fifth wheel
The ground cable
About 12 degrees off the line of the trailer
The kingpin to engage the driver's side locking jaw first
Directly in front of the trailer
The left rear outer dual wheel with the kingpin
The emergency tractor bakes will come on
The trailer's air tank will exhaust through the open line
Nothing is likely to happen until you try to apply the brakes
The emergency trailer brakes will come on
The shank
The head
The base
It does not matter
You can set the fifth wheel for weight balance
The parking lock is off and you can drive away
The coupling is not right and should be fixed before driving the coupled unit
The trailer will not swivel on the fifth wheel
Put the tractor in gear and pull ahead with a sharp jerk
Pull gently forward in low gear against the locked trailer brakes. Then look at it carefully.
Rock the trailer back and forth with the trailer brakes locked
Look at it carefully
1
2
3
4
To park at loading docks
To park on a grade
Never
To park for less then two hours
Raised 1/2 way with the crank handle removed
Fully raised with the crank handle secured in it's bracket
Three turns off the top with the crank handle secured in its bracket
Raised 3/4 way with the crank handle removed
Pushing in the trailer air supply valve
Pulling out the trailer air supply valve
Connecting the service line glad hand
Applying the trailer hand valve
It should not be done
It results in less skidding than using the brake alone
It is the best way to brake and keep the truck in a straight line
It lets the driver steer with both hands
1
2
3
4
To ensure good electrical conditions
To prevent steering problems
To reduce heat and noise
To keep the brake system in place
If the trailer has no spring brakes, you can drive away
The hand valve will apply the tractor brakes instead of the trailer brakes
The brake pedal will work the trailer spring brakes instead of the air brakes
The brake lights will not come on when the brake pedal is pressed
Turning on the parking brakes from the cab
Applying and releasing the trailer brakes and listening for brake sounds
Lifting the brake pedal
Watching your mirrors to see if the trailer lights come on
Red / Blue
Black / Yellow
Blue / Red
Orange / Black
Make sure the brakes are properly adjusted
Go slowly around turns
Keep the fifth wheel's free play as tight as possible
Keep both hands firmly on the steering wheel
Always delay braking a heavy vehicle until you have no other choice
Light vehicles need more braking power to stop than heavy ones
"BOBTAIL" tractors can take longer to stop than a combination vehicle loaded to the maximum gross weight.
The brake and suspension systems of comb. vehicles work best with a light load.
Are easier to brake because they are heavier
Usually need a glad hand converter
Ofter do not have spring brakes
Can not be legally operated on interstate highways
The connected brake circuit becomes a back-up air tank
It will keep dirt and water out of the lines
If you did not, you could never build system pressure
All of the above
Only with the foot brake
To test the trailer brakes
Only when the trailer is fully loaded
As a parking brake
Over the locking lever
Under the locking lever
Through the locking lever
Straight up
Supply air to the trailer system, then pull out the air supply knob to lock the trailer brakes
Make sure that the trailer brakes are off
Apply the brakes twice to alert others
Pull ahead to test the glad hand connections
There is enough clearance between the tops of the tractor tires and nose of trailer
There is enough clearance between the tractor frame and the landing gear
Both A and B are correct
Neither A and B are correct
Emergency trailer brakes to come on
Air compressor to unload instead of pumping air
Tractor supply valve to open
Tractor air to dump into the trailer tank through the service line
Trailer emergency brakes to come on
Trailer tank pressure to be lost
Tractor spring brakes to be locked on
Trailer's tank pressure to go to the tractor's system
The tractor to loose all air pressure
The tractor protection valve to close
The trailer supply valve to stay open
None of the above
Trailer landing gear is fully extended
End of the kingpin is even with the top of the fifth wheel
Trailer will be lifted slightly when the tractor backs under it
Kingpin is about 1 1/4 inches above the fifth wheel
At least 1/2 inch
None
Just enough to see light through it
About 1/4 inch
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