CA CDL COMBINATION PRACTICE TEST
11.
Most hydraulic brake failures occur for one of two reasons, one of which is:
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loss of hydraulic pressure.
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excessive downshifting.
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relying too much on the engine braking effect.
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12.
To prevent rollover, you should:
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keep the cargo as close to the ground as possible.
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go slowly around turns.
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All of the above.
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13.
If a drawbridge does not have a signal light or traffic control attendant, you should:
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stop and look to make sure the draw is completely closed before crossing.
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drive through the drawbridge with caution.
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stop at least 5 feet before the draw of the bridge.
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14.
During a walk around inspection of a combination vehicle, drivers should check that:
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all locking pins are present and locked in place.
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the glide plate is securely mounted to the trailer frame.
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All of the above.
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15.
When should you use the hand valve to park a combination vehicle?
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Never.
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When parking downhill.
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To park at loading docks.
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16.
Which of these is more likely to rollover due to the "crack-the-whip" effect?
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The last trailer of doubles
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The front trailer of 65 ft. conventional doubles
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The last trailer of triples
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17.
Which of the following may have reduced the clearances since the heights were posted at bridges and overpasses?
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Rain
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The weight of a cargo
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Repaving of the road
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18.
Do not use the trailer hand valve in driving because:
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the trailer emergency brakes will come on.
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of the danger of making the trailer skid.
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All of the above.
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19.
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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a supplement to the braking effect of the engine.
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20.
Which of the following is NOT TRUE? When you drive a tractor-trailer combination with ABS, you should:
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monitor your tractor and trailer as you slow down, and if it is safe to do so, back off the brakes to stay in control.
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brake the same way, regardless of whether you have ABS on the tractor, the trailer, or both.
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drive slower to keep your vehicle in a straight line.
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