Sunny Truck Driving School - Online Test

Choose a test

Combination Vehicles Test

Q. 1) How should you test the tractor semi trailer connection for security?
a) Pull gently forward in low gear against the locked trailer brakes, then look at it carefully
b) Rock the trailer back and forth with the trailer brakes locked

Q. 2) You are coupling a tractor to a semi trailer and have backed up but are not under it. What should you hook up before backing under?
a) The electrical service cable
b) Nothing, back up and lock the fifth wheel
c) Nothing, back up and lock the fifth wheel

Q. 3) You are driving a combination vehicle when the trailer breaks away, pulling apart both air lines. You would expect the trailer brakes to come on and:
a) The tractor protection valve close
b) The trailer supply valve to stay open
c) The tractor to lose all air pressure

Q. 4) Semi trailers made before 1975 that are equipped wit air brakes:
a) Are easier to brake because they are heavier
b) Usually need a glad hand converter
c) Often do not have spring brakes

Q. 5) The air leakage rate for a combination vehicle (engine off, brakes off) should be no more than_____ psi pr minute.
a) 3
b) 4
c) 2

Q. 6) You have coupled wit a semi trailer. In what position should you put the front trailer supports before driving away?
a) Three turns off the top with the crank handle secured in it's bracket
b) Fully raised with the crank handle secured in its bracket
c) Raised ? way with the crank handle removed

Q. 7) You should not back a tractor until the whole air system is:
a) bled down to half the maximum pressure
b) At normal pressure
c) between 60 and 80 psi

Q. 8) Which type of truck-trailer combination has the best chance of the "crack the whip" rollover?
a) A tractor pulling 2 trailers
b) A single tractor trailer
c) A tractor pulling 3 trailers

Q. 9) Why should you be sure that the fifth wheel plate is greased are required?
a) To reduce heat and noise
b) To prevent steering problems
c) To ensure good electrical connections

Q. 10) Almost half of all truck driver deaths are the result of:
a) Rollovers
b) Speed
c) Following to closely

Q. 11) The front trailer supports are up and the trailer is resting on the tractor. Make sure:
a) both answers are correct
b) There is enough clearance between the tractor frame and the landing gear
c) There is enough clearance between the tops of the tractor tires and the nose of the trailer

Q. 12) You supply air to the trailer tanks by:
a) Pulling out the trailer air supply valve
b) Connecting the service line glad hand
c) Pushing in the trailer air supply valve

Q. 13) When backing under a tractor under a trailer you should expect:
a) Trailer landing gear is fully extended
b) End of the kingpin is even with the top of the fifth wheel
c) Trailer will be lifter slightly when the tractor backs under it

Q. 14) Before you back under a trailer, make sure the:
a) Air brakes are off
b) Trailer brakes are locked
c) Tractor protection valve is normal

Q. 15) The fifth wheel locking lever is not locked after the jaws close around the kingpin. That means that:
a) You can set the fifth wheel for weight balance
b) The parking lock is off and you may drive away
c) The coupling is not rigid and should be fixed before driving vehicle

Q. 16) You have a major leak in the service line and you put on the brakes.
a) Service air pressure will escape and cause the:
b) Trailer emergency brakes to come on
c) Trailer tank pressure to the lost
d) Tractor spring brakes to lock on

Q. 17) Choose 2 of the most important things in preventing rollovers.
a) Avoid following to closely
b) At night make sure you stop within the distance you can see
c) Keep the load centered in the trailer
d) Keep the cargo close to the ground

Q. 18) Why should you lock the tractor glad hands( or dummy couplers) to each other when you are not towing a trailer?
a) The connected brake circuit becomes a back up air tank
b) If you did not, you could never build system pressure
c) It will keep dirt and water out of the lines

Q. 19) Which part of the kingpin should the locking jaws close around?
a) The base
b) The head
c) The shank

Q. 20) When should you use the hand valve to park a combination vehicle?
a) To park at loading docks
b) Never
c) To park on a grade

Website Design and Development by IrisWebDesigns.com.