SD CDL DOUBLES TRIPLES PRACTICE TEST
11.
When driving a 50-foot truck at 40 mph, your minimum following distance should be:
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8 seconds
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4 seconds
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6 seconds
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5 seconds
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12.
Cargo should be properly covered:
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to protect the weather from the cargo.
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to block your view or someone else’s.
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to protect people from spilled cargo.
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All of the above.
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13.
ABS helps you:
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lock your wheels.
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keep the wheels from locking up.
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decrease your average speed.
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decrease your overall stopping distance.
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14.
The safety valve is usually set to open at:
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200 psi.
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150 psi.
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100 psi.
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75 psi.
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15.
The trailer hand valve should:
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be used in driving.
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never be used to test the trailer brakes.
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never be used for parking.
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All of the above.
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16.
Combination vehicles usually require _________ single commercial vehicles.
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less driving skill than
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the same level of skill as
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more driving skill than
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None of the above.
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17.
What is true about tire chains?
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You should learn how to put the chains on before you need to do it in snow.
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You must carry the at least 6 chains and extra cross-links.
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You should watch the official video tutorial by the manifacturer before putting them on.
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All of the above.
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18.
Regardless of its size, cargo should have at least ___ tie-downs.
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4
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2
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3
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1
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19.
Which of these describes the proper braking technique when driving on a long and steep downgrade?
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Apply the brakes until your speed has been reduced to 5 mph, then release the brakes. When your speed has increased to your safe speed, repeat the previous steps.
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Release the brakes until your speed is 5 mph above your safe speed, then apply the brakes. When your speed has decreased to your safe speed, repeat the previous steps.
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Apply the brakes. When your speed has been reduced to 5 mph below your safe speed, release the brakes. When your speed has increased to your safe speed, repeat the previous steps.
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All of the above.
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20.
In a combination vehicle, ________ is most likely to turn over.
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the last trailer
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the trailer behind the tractor
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the tractor
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All of the above.
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