CDL COMBINATION PRACTICE TEST IDAHO
11.
You must have at least 4/32 inch tread depth in every major groove on front tires and at least ___ inch on other tires.
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4/32
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1/32
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2/32
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12.
You should use chocks when parking a trailer without spring brakes because:
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it is required by law.
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the brakes will hold only as long as there is air pressure in the trailer air tank.
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it helps prevent skids.
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13.
The crack-the-whip effect:
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can cause a vehicle to tilt.
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can turn the trailer over.
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the ends of some vehicles to drag.
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14.
What factors can cause brakes to fail or fade?
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Excessive use of the service brakes
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Brakes out of adjustment
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All of the above.
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15.
Which of the following trailers can get stuck on raised crossings?
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Car carrier
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Lowboy
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All of the above.
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16.
Enough tread is especially important in winter conditions. You need at least ________ tread depth on steering axle tires.
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6/24 inch
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2/8 inch
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4/32 inch
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17.
When parking a trailer without spring brakes, it is very important for safety that you use wheel chocks. Why?
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if you don't use wheel chocks, supply air will be sent to the service line instead of going to charge the trailer air tanks.
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The air could leak out of the trailer air tank, releasing its emergency brakes.
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You may not notice a major leak in the service line until you try to put the brakes on.
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18.
A truck tractor with _________ requires the shortest stopping distance.
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an empty trailer
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a lightly loaded trailer
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a fully loaded trailer
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19.
After a tire has been changed, you should:
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decrease tire pressure.
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deflate the tire to 15 psi.
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stop a short while later and check that the nuts are tight.
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20.
When driving trucks with trailers, drivers should:
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make quick lane changes.
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avoid making sudden movements with the steering wheel.
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push the brake pedal to the floor when braking.
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