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43 Cards in this Set
- Front
- Back
On a tractor, where is the yellow antilock brake (ABS) malfunction lamp located? |
On the left front or left rear corner |
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You are coupling a semi-trailer to your tractor but have not yet backed it under it. The trailer is at the right height if?? |
It will be raised slightly when the tractor is backed under it. |
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Trucks roll over more easily when fully loaded and are |
Ten times more likely to roll over in a crash than empty rigs |
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The service line |
Carries air to relay valve that allows the trailer brakes to be applied quickly. |
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To stop a trailer skid, you should? |
Release the brakes |
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What is the safety way for you to make a turn without you entering another traffic lane? |
You should turn wide as you complete the turn. |
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To test the tractor protection valve, charge the trailer air brake system, turn of the engine, and |
Step on and off the brake pedal several times |
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You should not back a tractor under a trailer until the whole air system is |
At normal pressure |
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You are coupling a tractor to a semi-trailer. You have connected the air lines. Before backing under the trailer, you should |
Supply air to the trailer system and then pull out the air supply knob. |
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On a double or triple vehicle, which wheels off track the most? |
The rear wheels of the last trailer |
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When you get ready to back under the semi-trailer, you should line up |
Directly in front of the trailer |
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What is the emergency air line? |
Air lines that control the emergency brakes on combination vehicles |
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You are coupling a tractor to a semi-trailer. You have backed up but are not yet under it. Before backing under the semi-trailer, you should hook up |
The emergency and service air lines |
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If you do not do the final air brake check for air leaks and fix them before driving, |
You could lose your brakes while driving. |
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If your vehicle gets stuck on a railroad track, you should |
Get away from your vehicle and call 911 or posted emergency number |
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To drive a triple combination vehicle, you must have |
A class A CDL with double/triple (T) endorsement |
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An antilock braking system (ABS) is useful |
Whether it is on a tractor or the trailers |
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Before you back under a trailer, make sure that |
The trailer brakes are locked |
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When you test the tractor protection valve, the red air supply control knob should go into the __________ position. |
Emergency |
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You have a major leak in the service line, and you apply the brakes. Service air pressure will escape and cause the |
Trailer emergency brake to come on. |
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When should you use a hand valve to park a combination vehicle? |
Never |
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While you are driving, your emergency air line breaks or gets pulled apart. The loss of pressure would cause the |
Trailer emergency brakes to come on. |
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Semi-trailers made before 1975 that are equipped with air brakes |
Often dont have spring brakes. |
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When backing a tractor under a trailer, you should expect that |
The trailer will be lifted slightly when the tractor backs under it. |
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How should you test the tractor-semitrailer connection for security? |
Pull gently forward in low gear against the locked trailer brakes, then look at it carefully |
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At night, when a vehicle is carrying a load that extends four feet more beyond the rear of the body, there must be______at the extreme end of the load |
Red lights |
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To prevent rollover, cargo should be |
spread evenly across the rig and as low as possible |
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If you have coupled with a semi-trailer, where should you put the front trailer support before driving away? |
Fully raised with crank handle secured in its bracket. |
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B |
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The tractor protection valve will close and the trailer _______ brakes will come on when there is a major leak in the brake line. |
Emergency |
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If the brakes did not release when you pushed the trailer air Supply valve, you should |
Check the air line connections |
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The fifth wheel locking lever is not locked at the jaws close around the kingpin. This means that |
The coupling is not right and should be fixed before you drive the coupled unit. |
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What is another names for the service air line? |
Control and signal air lines |
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The iron trailer supports are up, and the trailer is resting on the tractor. Make sure that |
There is enough clearance between the tractor frame and the landing gear. |
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Air lines on a combination vehicle are often colored to keep them from getting mixed up. The emergency line is ______ ; the service line is ______ . |
Red and blue |
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The best way to tell if your trailer has started to skid is to |
See it in the mirrors. |
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You Supply air to the trailer tank by |
Pushing the trailer air Supply control |
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Glad hand are used to connect the |
Service and emergency air lines from the truck or tractor to the trailer. |
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For coupling to be completed, safety catch for the fifth wheel locking lever must be |
Over the lock lever |
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Under good driving conditions, you should leave at least one second of space between your vehicle and the vehicle ahead for every ______ feet or your vehicle's length. |
10 |
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When you are uncoupling a loaded trailer, lower the landing gear until it |
Makes firm contact with the ground. |
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Low-slung vehicles can be risky at railroad crossings because |
They are more likely to get stuck on raised railroad crossings. |
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When connecting the glad hands, press the two seals together with the couplers at what angle to each other? |
90 degree |