CDL DOUBLES TRIPLES PRACTICE TEST ARKANSAS
11.
Older trailers do not have spring brakes. If the air supply leaks away:
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the ABS won't work properly.
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the trailer will stop normally.
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there will be no emergency brakes.
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All of the above.
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12.
ABS helps you:
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stop faster.
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drive faster.
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brake harder.
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None of the above.
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13.
Which of the following is NOT a reason for hydraulic brake failure?
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Loss of hydraulic pressure
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Stab braking
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Brake fade on long hills
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All of the above.
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14.
Emergency brakes are:
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not required on buses.
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not required on commercial vehicles with air brakes.
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required on all vehicles.
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not required on doubles.
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15.
Which of the following is a reason to cover 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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To contain a spill
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All of the above.
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16.
When you double your speed, the braking distance is:
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4 times longer.
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3 times longer.
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2 times longer.
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the same.
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17.
The tractor protection valve:
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keeps air in the brake system should the trailer develop a bad leak.
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prevents the trailer from being accidentally released.
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keeps air from going out if the air compressor develops a leak.
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keeps your wheels from locking up when you brake hard.
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18.
You should flash your brake lights to warn drivers behind you when:
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you see a bus stops in the roadway ahead to unload passengers.
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you see you'll need to slow down.
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you see a hazard that will require slowing down.
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All of the above.
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19.
The best advice for driving in fog is:
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use low beams.
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use high beams.
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drive slowly in the left lane of traffic.
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don't drive.
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20.
To start moving without rolling back, you should:
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apply the trailer brake hand valve.
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put on the parking brake whenever necessary.
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partly engage the clutch before you take your right foot off the brake.
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All of the above.
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