CO CDL COMBINATION PRACTICE TEST
11.
During your inspection, you should look into the fifth-wheel gap and check that the _________ are fully closed around the kingpin.
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lug nuts
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locking jaws
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mounting bolts
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couplings (U-joints)
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12.
To prevent a rollover, you should keep the cargo as close to the ground as possible and:
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keep an eye on your tires.
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make sure that the release arm is in the engaged position.
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go slowly around turns.
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keep the vents clear so they work correctly.
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13.
Empty trucks require _____ stopping distances because empty vehicles have ______ traction.
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greater; more
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less; less
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less; more
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greater; less
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14.
Foundation brakes are used:
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only with the front wheels.
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at each wheel.
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only with the rear wheels.
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only with the right wheels.
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15.
Do not use the trailer hand valve in driving because:
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the trailer emergency brakes will come on.
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the brakes can overheat and lose their braking power.
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of the danger of making the trailer skid.
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All of the above.
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16.
Before connecting the converter dolly to the rear trailer, make sure that:
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the kingpin rests on the fifth-wheel.
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the shut-off valves at the rear of the first trailer are open.
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the locking jaws rest on the kingpin.
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the trailer height is slightly lower than the center of the fifth-wheel.
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17.
When driving trucks with trailers, drivers should:
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make quick lane changes.
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push the brake pedal to the floor when braking.
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avoid making sudden movements with the steering wheel.
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decrease their following distance.
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18.
To secure the tractor you should:
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Put on the parking brake and put the transmission in neutral.
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Connect the tractor service air-line to the trailer service glad hand.
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Check that the kingpin and the fifth-wheel are aligned.
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All of the above.
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19.
When the wheels of a trailer lock up, the trailer will tend to swing around. This is more likely to happen when:
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the trailer is fully loaded.
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the trailer is empty or lightly loaded.
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the trailer is overloaded.
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None of the above.
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20.
If your trailer starts to skid, you should:
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steer in the opposite direction.
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release the brakes.
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pump the brakes.
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lock the brakes.
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