ILLINOIS CDL COMBINATION PRACTICE TEST
11.
The emergency air line:
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controls the emergency brakes on combination vehicles.
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causes the tractor protection valve to close when the emergency line loses pressure.
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supplies air to the trailer air tanks.
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All of the above.
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12.
When checking your tires during a pre-trip inspection, which of the following is acceptable?
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Dual tires that come in contact with parts of the vehicle
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Cracks in the tires
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Tires made by different manufacturers
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Mismatched sizes
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13.
You are coupling a tractor to a semi-trailer. After checking the trailer height but before supplying air to the trailer, you should:
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connect the air lines to the trailer.
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inspect the fifth-wheel.
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raise the front trailer supports.
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lock the trailer brakes.
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14.
Most truck driver deaths in crashes result from:
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off-tracking.
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truck rollovers.
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following too closely.
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driving side-by-side with another truck.
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15.
You are checking the tractor-trailer connection to make sure it is safe and secure. The landing gear should be:
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fully lowered.
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fully raised.
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raised slightly off the ground.
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None of the above.
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16.
When coupling, you should:
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make sure the trailer wheels are not chocked.
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make sure the trailer kingpin is bent.
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make sure the sliding fifth-wheel is locked.
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be aware that wrong coupling and uncoupling can be very dangerous.
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17.
Combination vehicles usually:
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are easier to drive than single than single CMVs.
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are shorter than single than single CMVs.
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require more driving skill than single CMVs.
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All of the above.
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18.
ABS helps you:
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increase your normal braking capability.
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steer gently and smoothly while you are braking.
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stop much faster.
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avoid wheel lock up and maintain control of your vehicle when you brake.
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19.
ABS:
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allows you to brake harder.
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is an addition to your normal brakes.
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should only be used on dry roads.
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replaces your normal brakes.
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20.
When backing a tractor under a trailer, you should:
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stop before when the kingpin is locked into the fifth wheel.
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back at an angle.
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always use the lowest reverse gear.
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All of the above.
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