CDL COMBINATION PRACTICE TEST (IL)
11.
ABS will:
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increase your average speed.
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not give you more control over the vehicle during braking.
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shorten your stopping distance.
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not change your normal braking capability.
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12.
What is the minimum tread depth for tires other than front tires?
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4/32 inch
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2/32 inch
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8/32 inch
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4/16 inch
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13.
Which of the following makes a rollover more likely?
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Turning too fast.
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If the load is to one side so it makes a trailer lean.
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Weight that is loaded so there is a high center of gravity.
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All of the above.
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14.
When you use your mirrors while driving on the road, you should:
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only use the driver's side mirror.
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stare for a long time at the mirror.
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check them quickly.
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avoid checking them regularly.
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15.
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 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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the end of the kingpin is even with the top of the fifth wheel.
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None of the above.
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16.
If your truck has automatic transmission, you should downshift:
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whenever road conditions allow.
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after entering a curve.
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when you need to accelerate.
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when going down grades.
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17.
Which of the following is NOT part of inspecting the coupling?
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Checking that the locking lever is in the "lock" position
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Making sure the fifth-wheel jaws have closed around the shank of the kingpin.
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Checking for enough clearance between the rear of the tractor frame and the landing gear.
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Making sure there is no space between the upper and the lower fifth-wheel
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18.
If driving a heavy vehicle, you should:
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stay in the left lane.
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stay in the right lane.
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try to pass other vehicles going uphill.
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avoid braking.
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19.
On
a tractor-trailer equipped with a trailer brake hand
valve, the hand valve can be used to:
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reduce the chance of the front wheels skidding.
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hold compressed air.
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prevent movement of cargo.
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keep from rolling back.
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20.
What happens when the center of gravity of a truck moves higher up from the road?
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It is easier it is to turn around corners.
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The vehicle is more stable while turning.
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The truck becomes easier to turn over.
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It becomes much easier to downshift at the right rpm.
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