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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| There are two things that a driver can do to prevent a rollover. They are: Keep the cargo as close to the ground as possible, and: | show 🗑
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| If the service line disconnects while you're driving, what will happen right away? | show 🗑
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| show | By pushing in the trailer air supply valve
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| With the engine off and the brakes released, a combination vehicle air brake system shouldn't leak more than how many psi in one minute? | show 🗑
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| show | Hook up the emergency and service air lines
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| The fifth wheel locking lever is not locked after the jaws close around the kingpin. This means that: | show 🗑
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| After pushing in the trailer supply valve, you should not move the tractor until the whole air system is: | show 🗑
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| You cross the air lines when hooking up to an old trailer. What will happen? | show 🗑
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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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| show | Never
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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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| When not pulling a trailer, why is it a good idea to lock the glad hands together or to a dummy coupler? | show 🗑
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| How much space should be between the upper and the lower fifth wheel plates? | show 🗑
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| show | Pulling the tractor ahead gently with the trailer brakes locked
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| show | Never
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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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| You supply air to the trailer tanks by: | show 🗑
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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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| If the service air line comes apart while you are driving a combination vehicle but the emergency line stays together, what will happen right away? | show 🗑
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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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| 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: | show 🗑
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| show | None
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| show | Pulling the- tractor ahead gently with the trailer brakes locked.
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| The safety catch for the fifth wheel locking lever must be: | show 🗑
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| 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: | show 🗑
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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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| show | Trailer brakes are locked.
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| How should you test the tractor semi-trailer connection for security? | show 🗑
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| show | It will be raised slightly when the tractor is backed under it
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| show | Keep the cargo as close to the ground as possible.
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| show | The shank.
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| show | "Bobtail" tractors can take longer to stop than a combination vehicle loaded to maximum gross weight.
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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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| What will happen if the air lines are crossed when you hook up to an old trailer? | show 🗑
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| show | There is enough clearance between the tops of the tractor tires and the nose of the trailer.
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| show | Neither a or b is correct
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| You have a major leak in the service line and you put on the brakes. Service air pressure will escape and cause the: | show 🗑
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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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| Semi-trailers made before 1975 that are equipped with air brakes. | show 🗑
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| show | Directly in front of the trailer.
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| The air leakage rate for a combination vehicle (engine off, brakes on) should be less than ______psi per minute. | show 🗑
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| You can prevent a roll over by keeping the cargo as close to the ground as possible and: | show 🗑
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| show | The vehicle is lighter
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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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| show | To keep the dirt and water out of the lines.
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| show | You could drive away, but have no trailer brakes.
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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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| show | Pull out the air supply knob.
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| To make sure the kingpin and fifth wheel connection are secure, what should you do? | show 🗑
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| show | No space.
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| show | Have it repaired before driving.
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| show | Wait until the air pressure is normal.
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| show | When you pump the brake you will hear the brakes move and air escape.
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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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| You should use the trailer hand valve: | show 🗑
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| Why do you need a tractor protection valve? | show 🗑
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| show | The air pressure is low (20 to 45 psi).
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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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| After you have turned the hand brake on, how do you check the trailer brakes? | show 🗑
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| show | Turn the parking brakes off.
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| show 🗑
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Created by:
kevin18st