DOUBLES TRIPLES TEST ID - CDL PRACTICE TEST
11.
Before driving a vehicle with a dual air system, allow time for the air compressor to build up a minimum of ____ pressure in both the primary and secondary systems.
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50 psi
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75 psi
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100 psi
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12.
Older trailers do not have spring brakes. If the air supply leaks away:
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there will be no emergency brakes.
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the ABS won't work properly.
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the trailer will stop normally.
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13.
An item that is 15 feet long placed on a flatbed trailer should have at least:
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2 tie-downs.
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1 tie-down.
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3 tie-downs.
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14.
Which of the following is not a type of retarder?
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Hydraulic
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Exhaust
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Pressure
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15.
If there is a fire and you are not sure what to use to put it out, you should:
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use a fire extinguisher.
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wait for firefighters.
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use water.
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16.
If a vehicle is equipped with ABS, when you start the engine:
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the ABS indicator light on the dash should come on and then turn off.
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the wheels will lock up.
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the spring brakes will come on.
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17.
Do NOT use the parking brakes:
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when you park for less than two hours.
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if the brakes are very hot.
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when you leave your vehicle.
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18.
The trolley valve should be used only:
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to test the trailer brakes.
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to prevent skids.
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in driving.
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19.
What factors can cause brakes to fade?
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Dirt roads and in unpaved yards.
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Slippery surfaces and shaded areas.
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Excessive heat and brakes out of adjustment.
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20.
Texting is:
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the most dangerous distraction.
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about as safe as adjusting the radio.
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safer than talking on a cell phone.
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