CDL DOUBLES PRACTICE TEST WYOMING
11.
Excessive use of the service brakes results in overheating. Too much heat can:
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cause the brakes to grab.
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cause the brakes to squeak.
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make the brakes stop working.
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cause the brakes apply unevenly.
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12.
When driving with more than one trailer, the _______ trailer should be the first one behind the tractor.
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shortest
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longest
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lightest
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heaviest
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13.
The posted speed for a curve that may be safe for a straight truck:
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could be too fast for a double or triple.
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is likely to be safe for a double or triple.
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is never safe for a double or triple.
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can be ignored when driving a double or triple.
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14.
Which of the following statements about doubles/triples is true?
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Doubles/triples are more stable than other CMVs.
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Doubles/triples may have to go faster around corners than single trailer combination vehicles.
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A safe speed on a curve for a single trailer combination vehicle may be too fast for a double/triple.
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All of the above.
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15.
How should you apply the brakes when going down a steep downgrade?
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Apply the brakes as hard as you can without locking the wheels.
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You should not brake, and only use engine braking to prevent brake failure.
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Apply the brakes whenever you reach your safe speed, until your speed has been reduced to 5 mph below your safe speed.
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Apply the brakes when you reach the bottom of the downgrade.
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16.
Why should you cover your cargo?
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To protect people from spilled cargo.
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To protect the cargo from weather.
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Because spill protection is a safety requirement in many states.
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All of the above.
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17.
If brakes fail on a long downgrade, you should:
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turn off the engine as soon as you.
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pump the brake pedal 3 times.
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set the parking brake.
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use an escape ramp if it is available.
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18.
Emergency brakes are:
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not required on buses.
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required on all vehicles.
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not required on doubles.
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not required on commercial vehicles with air brakes.
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19.
The earliest way to recognize that your trailer has started to skid is:
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by checking your mirrors.
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by releasing the brakes.
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by checking the jackknife sensor.
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by hearing squeaking noises from the wheels.
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20.
Your vehicle should be equipped with all of the following except:
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Instructions
on how to perform a vehicle inspection test
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Spare electrical fuses
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Warning devices for parked vehicles
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Fire extinguisher
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