COMBINATION PRACTICE TEST - LA CDL
11.
Dollies with ABS are required to have a malfunction lamp:
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on the left side.
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on the front.
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on the right side.
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on the rear.
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12.
The best way to recognize that your trailer has started to skid is:
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by seeing it in your mirrors.
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by opening the window and feeling the front of the mirror.
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by feeling the brakes come on.
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by recognizing tire failure.
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13.
When the tractor protection valve closes, the trailer _______ brakes will come on.
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emergency
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hand
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service
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parking
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14.
Which of the following will NOT help you prevent rollover?
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Driving slowly around turns.
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Using the controlled braking method.
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Keeping the cargo as close to the ground as possible.
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All of the above.
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15.
How can you tell if a converter dollie has ABS?
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There is a red lamp on the left side of the dolly.
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There is an ABS plaque on the right side of the dolly.
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There is a yellow lamp on the left side of the dolly.
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There is an ABS system on the right side of the dolly.
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16.
You are coupling a semi-trailer to your tractor but have not yet backed under. The trailer is at the right height when:
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the end of the kingpin is even with the top of the fifth wheel.
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the locking jaws are around the head of the kingpin.
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it will be raised slightly when the tractor is backed under it.
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None of the above.
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17.
You are hooking up to an old trailer. The trailer does not have spring brakes. If you cross the air lines:
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the glad hands will be locked together.
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you will be able to drive away but you will not have trailer brakes.
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the trailer hand valve will apply the tractor brakes instead of the trailer brakes.
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None of the above.
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18.
Blocking _______________ to keep it from sliding.
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goes from the upper part of the cargo to the floor
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is used in the front, back, and/or sides of a piece of cargo
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is used only in the back of a piece of cargo
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None of the above.
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19.
You should use chocks when parking a trailer without spring brakes because:
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the brakes will hold only as long as there is air pressure in the trailer air tank.
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it helps prevent skids.
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it helps prevent brake failure.
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it is required by law.
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20.
If ABS is not working:
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you will not have any brakes.
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you should use the parking brake.
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you will still have brakes.
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you should use the emergency brake.
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