CDL DOUBLES TRIPLES PRACTICE TEST SOUTH DAKOTA
11.
The trolley valve should be used only:
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to prevent skids.
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in an emergency.
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to test the trailer brakes.
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in driving.
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12.
Glad hands are:
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warning devices.
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electronic devices.
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securement devices.
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coupling devices.
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13.
To test your parking brake, do the following:
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Set the parking brake while going downhill.
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Speed up to 15 mph, then set the parking brake.
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Set the parking brake, and gently pull against it in a low gear.
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Speed up to 5 mph, then set the parking brake.
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14.
When possible, you should park:
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on the shoulder.
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on the roadway.
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so you will be able to pull forward when you leave.
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so you will have to back up when you leave.
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15.
Why should you cover your cargo?
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To protect people from spilled cargo.
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Because spill protection is a safety requirement in many states.
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To protect the cargo from weather.
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All of the above.
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16.
Which of the following road surfaces freezes first?
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Bridges
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Parkings
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Open roads
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Underpasses
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17.
If the drive wheels begin to spin, you should:
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accelerate smoothly and change gears as necessary.
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apply your brakes all the way.
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take your foot off the accelerator.
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wait 4-5 seconds before applying the accelerator.
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18.
Air pressure should build up in a single air system, within about:
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10 minutes.
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1 minute.
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3 minutes.
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15 minutes.
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19.
If there is a fire and you are not sure what to use to put it out, you should:
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use water.
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use dry powder.
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wait for firefighters.
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use a fire extinguisher.
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20.
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 when you reach the bottom of the downgrade.
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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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