CDL COMBINATION PRACTICE TEST OREGON
11.
On
a tractor-trailer equipped with a trailer brake hand
valve, the hand valve can be used to:
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prevent movement of cargo.
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keep from rolling back.
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reduce the chance of the front wheels skidding.
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hold compressed air.
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12.
A trailer jackknife is more likely to happen when the trailer is:
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loaded to its full capacity.
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overloaded.
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empty.
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None of the above.
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13.
Which of the following may have reduced the clearances since the heights were posted at bridges and overpasses?
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The weight of a cargo
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Traffic
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Rain
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Repaving of the road
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14.
If your vehicle has dummy couplers, why should you use them when the air lines are not connected to a trailer?
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To prevent overheating.
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To prevent freezing of the washer liquid.
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To prevent water and dirt from getting into the coupler and the air lines.
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Because if you don't, you will never build system pressure.
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15.
Which of these is NOT part of the basic method for shifting up?
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Accelerate while pressing the clutch and turn toward the driver's side.
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Release the accelerator, push in the clutch and shift to neutral at the same time.
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Push in the clutch and shift to the higher gear at the same time.
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Release the clutch and press the accelerator at the same time.
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16.
You must check that all shut-off valves are in the open position except the ones:
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on the middle trailer of a set of triples.
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on the first trailer in a set of doubles.
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on the first trailer in a set of triples.
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at the back of the last trailer.
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17.
Which of the following is not a reason for covering cargo?
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To protect people from spilled cargo
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To prevent other drivers from looking at the cargo
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To protect the cargo from weather
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All of the above.
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18.
When you inspect the coupling, make sure there is ______ between the upper and lower fifth wheel.
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about 1/2 inch
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no space
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about 1 inch
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enough space
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19.
Enough tread is especially important in winter conditions. You need at least ________ tread depth on steering axle tires.
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2/8 inch
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6/24 inch
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4/32 inch
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8/32 inch
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20.
When you drive a tractor-trailer combination with ABS, you should:
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brake as you always have.
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apply the trailer hand brake whe braking.
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pump the brakes.
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always apply the brakes hard.
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