WYOMING CDL COMBINATION PRACTICE TEST
11.
The best way to recognize that your trailer has started to skid is:
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by opening the window and feeling the front of the mirror.
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by recognizing tire failure.
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by seeing it in your mirrors.
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by feeling the brakes come on.
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12.
After supplying air to the trailer brake system, you should check the brake system for crossed air lines by:
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shutting the engine off so you can hear the brakes.
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applying and releasing the trailer brakes and listening for the sound of trailer brakes.
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checking the air brake system pressure gauge for signs of major air loss.
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All of the above.
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13.
The emergency air line does NOT:
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control the emergency brakes on combination vehicles.
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cause the tractor protection valve to close when the emergency line loses pressure.
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supply air to the trailer air tanks.
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pump air into the relay valves, allowing the trailer brakes to be applied more quickly.
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14.
Emergency lines on combination vehicles are often coded with the color ____ to keep from getting them mixed up with the ____ service line.
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yellow; black
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blue; red
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red; yellow
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red; blue
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15.
When using a fire extinguisher, you should stay:
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at whatever distance you think is safe.
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as far away from the fire as possible.
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as close to the fire as possible, without getting burnt.
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at least 10 feet away from the fire.
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16.
If there is a cargo fire in a van or box trailer, you should:
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keep the doors shut.
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open the doors, especially if your cargo contains hazardous materials.
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enlist the help of bystanders.
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keep driving until you reach help.
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17.
After starting the engine, oil pressure should rise to a normal level:
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within 3 miles.
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within 2 minutes.
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within seconds.
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within 6 minutes.
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18.
To prevent a rollover, you should keep the cargo as close to the ground as possible and:
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keep the vents clear so they work correctly.
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keep an eye on your tires.
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go slowly around turns.
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make sure that the release arm is in the engaged position.
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19.
Inspecting the fifth-wheel does NOT include:
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checking that there are no cracks in the frame.
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checking for missing or damaged parts.
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backing until the fifth-wheel just touches the trailer.
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making sure that the fifth wheel is in the proper position for coupling.
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20.
When you get ready to back under the semi-trailer, you should:
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back under the trailer at an angle to avoid pushing the trailer sideways.
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line up about 15 degrees off the line of the trailer.
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line up the kingpin to engage the driver's side locking jaw first.
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line up directly in front of the trailer.
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