CDL COMBINATION PRACTICE TEST (WY)
11.
Most heavy vehicles require ________ change gears.
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double shifting
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single clutching
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double clutching
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triple shifting
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12.
If your trucks has a high center of gravity, which of the following is true for curves?
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Reduce your speed to a crawl.
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You should slow down, as your truck can roll over at the posted speed limit for the curve.
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You should travel at the posted speed limit.
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None of the above.
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13.
If you are driving a 30 foot vehicle at 35 mph, you should leave at least _______ between your vehicle and the vehicle in front of you.
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4 seconds
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1 seconds
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3 seconds
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2 seconds
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14.
When the trailer breaks away or develops a bad leak, the tractor protection valve will close automatically and:
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the tractor will lose all air pressure.
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the engine will shut down.
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the trailer emergency brakes will come on.
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the trailer supply valve will stay open.
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15.
You are driving a heavy vehicle with a manual transmission, and you have to stop on the shoulder while driving on an uphill grade. When putting your vehicle back in motion up the grade, you should:
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partly engage the clutch before you take your right foot off the brake.
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shift down to a speed that you can control without using the brakes.
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use the parking brake to hold the vehicle until the clutch engages.
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keep the clutch slipping while slowly accelerating.
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16.
If your vehicle is equipped with air brakes, loss of air pressure in the emergency line will cause:
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the springs to put on the brakes.
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the trailer emergency brakes to come on.
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the trailer supply valve to open.
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the vehicle to slide back and forth.
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17.
On
a tractor-trailer equipped with a trailer brake hand
valve, the hand valve can be used to:
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hold compressed air.
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keep from rolling back.
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reduce the chance of the front wheels skidding.
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prevent movement of cargo.
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18.
What happens when the center of gravity of a truck moves higher up from the road?
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The truck becomes easier to turn over.
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It is easier it is to turn around corners.
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It becomes much easier to downshift at the right rpm.
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The vehicle is more stable while turning.
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19.
Fully loaded rigs:
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are less likely to roll over than empty rigs.
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are much more likely to roll over than empty rigs.
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are just as likely to roll over as empty rigs.
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None of the above.
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20.
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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