Combination Vehicle #2
When uncoupling, it's a good practice to...
Hang the electrical cable with the plug end down
Couple the glad hands to dummy couplers
All answers are acceptable
Couple the glad hands together
If you cross your air lines on a new trailer with spring brakes...
You won't be able to release the trailer brakes
You'll have no way of knowing there's a problem
You won't be able to release the tractor brakes
You won't have any operational brakes
When traveling under 40 mph, you should follow other vehicles...
With a distance of one second for every twenty feet of your vehicle length
As close as possible so others don't cut in
With a distance of one second for every ten feet of your vehicle length
Only during the day
In order to supply air to the trailer, you must first...
Push in the tractor protection valve.
Cross the air lines to check for leaks
Stop engine so you can hear the brakes
Pull out the "air supply' knob
If one of the glad hands on your blue air line is missing a seal...
You could experience an emergency line air leak
You might end up with a service line air leak
Take one off the red air line and use that as a temporary replacement
It's not a major problem and you should continue coupling
When you inspect the coupling, check to ensure that...
The landing gear handle is hanging free
There's a little slack in the air lines
There's no slack in the air lines
The electrical cable is unplugged
The trailer hand valve should be used...
Only to test the trailer brakes
Only when parking
Only at highway speeds and only when parking
Only at highway speeds
Which one of the following statements about tractor protection valves is NOT true?
It is controlled by the trailer air supply valve in the cab
When it closes it allows air to leak from the tractor line
It keeps air in the tractor in the event the trailer air leaks
It will close automatically if air pressure is low
You can damage the landing gear if you...
Back under the trailer in a straight line
Align the tractor and trailer
Back under the trailer at an angle
Position the trailer kingpin in the center of the fifth wheel
Which one of the following is controlled by the foot brake?
The emergency air line
The hose coupler
The service air line
The shut off valve
When coupling the trailer, back up slowly until...
You hit the front of the trailer with the tractor
You can see the rear wheels in the mirror
The load shifts inside the trailer
The fifth wheel just touches the trailer
The earliest way to notice a trailer skid is...
By feeling a jerking in the back of the tractor
By hearing the squeal from the tires
By seeing it in your mirrors
By feeling the pull on your steering wheel
A king pin is...
The pin which locks the air brake lines together
A pin which locks the trailer to the tractor on the fifth wheel
A pin which holds the wheels on the axles
The pin a driver receives for safe driving
The trailer should be lowered so that...
The tractor strikes the nose of the trailer
The trailer is far above the fifth wheel
It's raised slightly when the tractor's backed under it
You can use the landing gear to make any adjustments
Which of the following steps comes first?
Raise the landing gear
Apply the trailer brakes
Connect the air supply lines
Put the transmission in reverse
Before you begin coupling...
Check your path for hazards
Pre-position the fifth wheel
Check the condition of the tractor frame
Put the spring brakes on
The trailer air supply control...
Is a red, triangular-shaped knob
Is a red, eight sided knob
Is a yellow, square knob
Is a red, square knob
In order to inspect the coupling you should...
Check that the locking lever is in the open position
Make sure the fifth wheel jaws are open
Make sure there is space between the upper and lower fifth wheel
Use a flashlight if necessary
You should crank the landing gear until...
You can clear railroad tracks
It is six inches off the ground
The crank handle is loose
It is as far up as it will go
The fifth wheel should be checked to see if...
It is properly greased
All answers are correct
There is damage or missing parts
The jaws are open
You should not back a tractor under a trailer until the whole air system is:
Empty
At normal pressure
Bled down to half the maximum pressure
Between 60 and 80 psi
You are coupling a semi trailer to your tractor but have not yet backed under. The trailer is at the right height when:
It will be raised slightly when the tractor is backed under it.
The end of the kingpin is even with the top of the fifth wheel.
The kingpin is about 1 1/4 inches above the fifth wheel.
The fifth wheel is sure to miss the kingpin.
Which part of the kingpin should the locking jaws close around?
The base
The head
The shank
The shiny section
When you get ready to back under the semi trailer you should line up:
About 12 degrees off the line of the trailer.
The kingpin to engage the driver's side locking jaw first.
Exactly one trailer length in back of the trailer.
Directly in front of the trailer.
How should you test the tractor semi trailer connection for security?
Put the tractor in gear and pull ahead with a sharp jerk.
Don't worry. The connection should be fine.
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.
When should you use the hand valve to park a combination vehicle?
Never
To park at loading docks.
In sub-freezing temperatures.
To park on a grade
You supply air to the trailer tanks by:
Connecting the service line glad hand.
Pulling out the trailer air supply valve.
Pushing in the trailer air supply valve.
Connecting the blue line to the red line.
Why should you be sure that the fifth wheel plate is greased as required?
To ensure good electrical connections
To make uncoupling easier.
To reduce heat and noise
To prevent steering problems
After you supply air to the trailer, make sure the air lines are not crossed and the trailer brakes are working. This is done by:
Turning on the parking brakes from the cab.
Lifting the brake pedal.
Releasing the tractor brakes.
Applying and releasing the trailer brakes and listening for brake sounds.
There are two things that a driver can do to prevent a roll over. They are: (1) Keep the cargo as close to the ground as possible; and (2):
Make sure that the brakes are properly adjusted.
Go slowly around turns.
Keep the fifth wheel's free play as tight as possible.
Never drive a tanker.
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