Combination
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| show | Red
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| show | Reduce speed before entering turns
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| show | Nothing is likely to happen until you try the brakes
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| How do you supply air to the air tank on the trailer? | show 🗑
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| show | 3 psi
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| show | Hook up the emergency and service air lines
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| show | The coupling is not correct and should be corrected before driving the coupled unit
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| show | At normal pressure
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| show | If the trailer has no spring brakes, you could drive away but you wouldn't have trailer brakes
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| How far should you crank up the front trailer supports (dollies) after coupling a semi-trailer? | show 🗑
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| You're driving a combination vehicle when the trailer breaks away and pulls apart the air lines. You should expect the trailer brakes to apply and: | show 🗑
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| The hand valve should be used to park a combination vehicle: | show 🗑
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| Air brake equipped trailers made before 1975: | show 🗑
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| show | It should never be done
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| When backing up under a trailer, you should line up: | show 🗑
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| You're hooking up a tractor and semi-trailer, and you've connected both air lines. Before backing under the trailer, you should: | show 🗑
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| show | It keeps dirt and water out of the lines
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| show | None
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| After hooking up, you should check the fifth wheel connection by: | show 🗑
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| When should you use the hand valve to park a combination vehicle? | show 🗑
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| You have coupled with a semi-trailer. Where should you put the front trailer supports before driving away? | show 🗑
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| show | Pushing in the trailer air supply valve
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| 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? | show 🗑
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| show | Nothing is likely to happen until you try to apply the brakes.
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| In normal driving, some drivers use the hand valve before a brake pedal to prevent a jackknife. Which of these statements is true? | show 🗑
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| The air leakage rate for a combination vehicle (engine off, brakes off) should be less than ________ psi per minute. | show 🗑
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| The fifth wheel locking lever is locked after the jaws close around the kingpin. This means that: | show 🗑
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| Air lines on a combination vehicle are often colored to keep from getting them mixed up. The emergency line is _______; the service line is _______. | show 🗑
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| show | The tractor protection valve to close.
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| show | None
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| After you lock the kingpin into the fifth wheel, you should check the connection by: | show 🗑
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| The safety catch for the fifth wheel locking lever must be: | show 🗑
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| show | Applying and releasing the trailer brakes and listening for brake sounds.
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| show | Walk around the rig to be sure that it is clear.
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| You should not back a tractor under a trailer until the whole air system is: | show 🗑
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| Before you back under a trailer, make sure the: | show 🗑
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| show | Pull gently forward in low gear against the locked trailer brakes then look at it carefully.
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| show | It will be raised slightly when the tractor is backed under it
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| Here are two things that a driver can do to prevent a rollover. They are: (1) Go slow around turns; and (2): | show 🗑
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| Which part of the kingpin should the locking jaws close around? | show 🗑
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| Which of these statements is true? | show 🗑
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| show | Emergency trailer brakes come on.
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| Why should you be sure that the fifth wheel plate is greased as required? | show 🗑
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| show | If the trailer has no spring brakes, you could drive away but you would not have trailer brakes.
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| The front trailer supports are up and the trailer is resting on the tractor. Make sure: | show 🗑
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| show | There is enough clearance between the tractor frame and the landing gear.
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| show 🗑
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| show 🗑
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| show | Trailer emergency brakes to come on.
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| show | It will keep dirt and water out of the lines.
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| show | To test the trailer brakes.
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| show | Often do not have spring brakes.
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| When you get ready to back under a semi-trailer, you should line up: | show 🗑
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| show | 4.
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| show | Going slow around curves.
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| Why are "bobtail" tractors harder to stop? | show 🗑
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| On a combination vehicle, to stop a jackknife: | show 🗑
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| show | When the rear wheels follow a different path than the front wheels.
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| You need ________ times more stopping distance when stopping a combination at 40 miles per hour than at 20 miles per hour. | show 🗑
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| show | Supplies the trailer with air.
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| The service air line: | show 🗑
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| show | Red.
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| Why should you connect the air hose couplers together? | show 🗑
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| What happens when you cross the air lines of an older trailer without spring brakes? | show 🗑
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| Why do many trailers built before 1975 have no parking brakes? | show 🗑
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| show | Nothing is likely to happen until you press the brakes.
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| show | It prevents steering problems.
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| What should you do just before the tractor is coupled? | show 🗑
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| show | Directly in front of the trailer
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| show | The trailer is lifted slightly when the tractor connects.
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| During coupling, how do you lock the trailer brakes before you back under the trailer? | show 🗑
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| To make sure the kingpin and fifth wheel connection are secure, what should you do? | show 🗑
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| When coupling is complete, how much space should there be between the upper and lower fifth wheel? | show 🗑
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| When the fifth wheel locking lever is almost in the locking position but will not lock, what should you do? | show 🗑
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| After the tractor is coupled, you should not move it until you push in the air supply knob and: | show 🗑
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| After coupling, you can make sure the air lines are not crossed because: | show 🗑
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| show | 3 psi per minute.
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| The maximum leakage rate for a combination vehicle with the engine off and brakes on is: | show 🗑
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| show | To test the trailer brakes.
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| Why do you need a tractor protection valve? | show 🗑
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| The tractor protection valve will close automatically when: | show 🗑
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| When testing the trailer emergency brakes, you should charge the air brake system, check that the trailer rolls freely, and: | show 🗑
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| show | Bring the air pressure up to normal.
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| show | Turn the parking brakes off.
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| show 🗑
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| show 🗑
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Created by:
kevin18st