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When backing a tractor under a trailer, you should:
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After the trailer has been coupled to the tractor, the tractor protection valve should be placed in what position?
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COMBINATION
| Question | Answer |
|---|---|
| When backing a tractor under a trailer, you should: | Always use the lowest reverse gear |
| After the trailer has been coupled to the tractor, the tractor protection valve should be placed in what position? | Normal position |
| The fifth wheel locking lever is not locked after the jaws have closed around the kingpin. This means that: | The coupling is not right and should be fixed before driving the coupled unit |
| Off-tracking or cheating causes which of these to follow the wider pass while making a turn? | Tractor with 45-feet trailer |
| The air lines on combination vehicles are often colored to prevent them from getting mixed up. The emergency line is____and the service line is____: | Red, blue |
| The air leakage rate for a combination vehicle(engine off, brakes on) should be less than____psi per minute: | 4 |
| Compared to a straight truck or bus there are___things to inspect on combination vehicles: | More |
| A tractor with a ____ trailer will require the shortest amount of stopping distance: | Fully loaded |
| When you get ready to back under a semitrailer, you should line up: | Directly in front of the trailer |
| To unlock the fifth wheel, the locking lever should be placed in the ____ position: | Open |
| The tractor protection valve will close and the trailer emergency brakes will come on when there is a major leak in the ____ brake line: | Emergency |
| When coupling, the proper position of the fifth wheel is: | Tilted down toward the end of the trailer |
| What gear should the tractor be in after you uncouple the trailer and are inspecting the trailer supports? | Neutral |
| You have coupled to a semitrailer. Where should you put the iron trailer supports before driving away? | Fully raised with the crank handle secured in its bracket |
| The safety catch for the fifth wheel locking lever must be ____ for coupling to be complete | Over the locking lever |
| 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: | Applying and releasing the trailer brakes and listening for the sound of the brakes |
| Before you back under a trailer, make sure that: | The trailer brakes are locked |
| When you are uncoupling a loaded trailer, you should lower the landing gear until it: | Makes firm contact with the ground, then turn the crank handle a few extra turns |
| What will happen if the air lines are crossed when you hook up to an old trailer? | If the trailer has no spring brakes, you could drive away but you wouldn’t have trailer brakes |
| To stop a trailer skid: | Release the service brakes |
| Why should you be sure the fifth wheel plate is greased as required? | To prevent steering problems |
| Your emergency air line breaks or gets pulled apart while driving. The loss of pressure will cause the: | Emergency trailer brakes to come on |
| When connecting the glad hands, press the two coupler rubber seals together at what angle to each other? | 90 degrees |
| Which of these statements is true? | Bobtail tractors can take longer to stop than a combination vehicle loaded to maximum gross weight |
| After you have coupled the trailer, you should start raising the landing gear by using: | Low gear |
| You supply air to the trailer tanks by: | Pushing in the trailer air supply valve |
| Which part of the kingpin should the locking jaws close around? | The shank |
| How much space should be allowed between the upper and lower fifth wheel after coupling? | None |
| You have pushed in the trailer air supply valve. You should not back a tractor under a trailer until the whole system is: | At normal pressure |
| You are coupling a tractor to a semitrailer. You have connected the air lines. Before backing under the trailer, you should: | Supply air to the system then pull out the air supply knob |
| The air brake leakage rate for a combination vehicle (engine off, brakes off) should be less than___psi per minute: | 3 |
| The safest way to make a turn without entering another traffic lane is to: | You should turn wide as you complete the turn |
| The higher the center of gravity of your truck, the: | Easier to turn over |
| The hand valve should be used: | To test the trailer brakes |
| When driving a set of doubles it is necessary to close which shut- off valves on the last trailer? | Back valve |
| You are coupling a tractor to a semitrailer and have backed up but are not under it. What should you hook up before backing under? | The emergency and service air lines |
| Why should you lock the tractor glad hands to each other or to a dummy coupler when you are not towing a trailer? | It will keep dirt or water out of the lines |
| While driving behind another vehicle under good conditions you should allow at least one second between your vehicle and the vehicle ahead for each____(how many) feet of your vehicle length? | 10 |
| Glad hands are usually connecting which of these: | Service and emergency air lines from the vehicle to the trailer |
| You are about to back your tractor under a semitrailer. The trailer is at the right height when: | Trailer will be lifted slightly when the tractor backs under it |
| While checking if the trailer is securely coupled to the trailer, the landing gear should be: | Slightly raised |
| Air and electrical lines from the tractor to the trailer should be: | Secured, but with enough loop to turn |
| After you lock the kingpin into the fifth wheel, you should check the connection by: | Pulling the tractor forward gently with the trailer brakes locked |
| The front trailer supports are up and the trailer is resting on the tractor. Make sure: | a) There is enough clearance between the top of the tractor tires and the nose of the trailer b) There is enough clearance between the tractor frame and the landing gear c) Both a and b are correct |
| When uncoupling the trailer, after you shut off the trailer air supply and lock the trailer brakes, you should: | Back up gently to ease pressure on the fifth wheel |
| Air brake equipped trailers made before 1975: | Often do not have spring brakes |
| When checking the trailer emergency brakes the tractor protection valve should be placed in what position? | Emergency |
| You are driving a combination vehicle when the trailer breaks away, pulling apart both air lines. You expect the trailer emergency brakes to come on and: | The tractor protection valve to close |
| In normal driving, some drivers use the hand valve before the brake pedal to prevent a jack-knife. Which of the statements is true? | It should not be done |
| When should you use the hand valve to park a combination vehicle? | Never |
| When performing a pre-trip inspection and looking into the fifth wheel gap, you should: | make sure the locking jaws are fully closed around the kingpin |
| If there is a fire on a school bus, the students: | Must be evacuated |
| At a passive railroad crossing, the decision to proceed: | a) Rest with the driver b) entirely up to the driver |
| After students unload at the school, a driver should: | walk through the bus to check for any remaining students |
| How should you test the tractor-semitrailer connection for security? | A Pull gently forward in low gear against the locked trailer brakes |
| If taking the driving test and the route does not include a railroad crossing, you: | the examiner may ask you to explain and demonstrate the necessary procedures at a simulated location. |
| After connecting the air lines but before backing under the trailer you should: | A Supply air to the trailer system, then pull out the air supply knob. |
| If you cannot complete your turn without entering another traffic lane you should: | turn wide as you complete the turn |
| You have a major leak in the service line, and you put on the brakes. Service air will escape and cause the: | A Trailer tank pressure to be lost. |
| If the service line comes apart while you are driving a combination vehicle, but the emergency line stays together, what will happen right away? | A Nothing is likely to happen until you try to apply the brakes |
| Where should the tractor be when you inspect the landing gear after uncoupling the trailer? | A With the tractor frame under the trailer |
| There are two things that a driver can do to prevent a rollover: | (1) go slow around turns (2) keep the cargo as close to the ground as possible |
Created by:
kok777
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