CDL COMBINATION PRACTICE TEST (TX)
11.
Most heavy-duty vehicles use:
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hydraulic brakes.
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solid brakes.
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air brakes.
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pressure brakes.
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12.
Combination vehicles usually require _________ single commercial vehicles.
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the same level of skill as
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less driving skill than
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more driving skill than
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None of the above.
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13.
What is the proper following distance for a 40 foot truck traveling at 35 mph?
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12 seconds
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5 seconds
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10 seconds
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4 seconds
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14.
For a cargo fire in a box trailer, you should:
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use the fire extinguisher on the doors.
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keep the doors shut.
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wait 10 minutes before opening the doors.
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open the doors immediately and use the fire extinguisher.
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15.
The emergency air line:
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causes the tractor protection valve to close when the emergency line loses pressure.
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controls the emergency brakes on combination vehicles.
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supplies air to the trailer air tanks.
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All of the above.
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16.
To unlock the fifth wheel, pull the release handle to the _______ position.
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closed
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open
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sixth
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neutral
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17.
With brake drums, if brakes become too hot:
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the air compressor will kick on to cool the brakes.
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the brakes may stop working.
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the brakes will supply too much power to the drive wheels.
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your ABS will malfunction.
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18.
In combination vehicles with air brakes, the trailer air supply control:
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is a coupling devices used to connect the service and emergency air-lines from the tractor to the trailer.
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is used to control the tractor protection valve.
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is used to keep the trailer behind the tractor.
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supplies air to the trailer air tanks.
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19.
Transporting hanging meat requires special attention. Why?
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Because you have to drive fast to get it delivered fresh.
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Because hanging meat can be an unstable load with a high center of gravity.
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Because refrigerated trucks have less traction.
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All of the above.
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20.
Blocking and bracing are:
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coupling devices used to connect the service air lines from the truck or tractor to the trailer.
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driving techniques used to regain control when your drive wheels start to skid.
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used to keep cargo from sliding and to prevent movement of cargo.
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None of the above.
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