PA CDL COMBINATION PRACTICE TEST
11.
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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check them quickly.
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stare for a long time at the mirror.
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avoid checking them regularly.
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12.
The best way to recognize that your trailer has started to skid is:
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by hearing squeaking noises from the wheels.
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by seeing it in your mirrors.
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by using retarders.
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None of the above.
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13.
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 travel at the posted speed limit.
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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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None of the above.
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14.
A steering wheel should have no more than _____ of play. If there is more play than this, it may be hard to steer.
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10 degrees
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It doesn't matter.
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30 degrees
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15 degrees
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15.
The use of brakes on a steep downgrade is:
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much more effective than the engine braking effect.
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the main braking factor.
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dangerous, and should be avoided at all costs.
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a supplement to the braking effect of the engine.
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16.
When you make a quick lane change, the crack-the-whip effect can:
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improve your traction.
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the trailer to swing wide to the left.
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make it harder to turn without skidding.
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turn the trailer over.
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17.
ABS:
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should only be used on dry roads.
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is an addition to your normal brakes.
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replaces your normal brakes.
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allows you to brake harder.
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18.
How can you tell if a converter dollie has ABS?
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There is a red lamp on the left side of the dolly.
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There is an ABS plaque on the right side of the dolly.
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There is an ABS system on the right side of the dolly.
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There is a yellow lamp on the left side of the dolly.
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19.
A vehicle inspection should be done in the same order each time:
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because it is required by law.
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because it's much quicker.
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because the report must be written in that order.
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so you are less likely to forget something.
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20.
Air brakes:
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are prohibited on larger vehicles.
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should be used only when driving on wet roads.
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are an effective way to stop large and heavy vehicles.
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can improve fuel efficiency.
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