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UPGRADE TO CDL PREMIUM
1.
The Johnson bar is a valve that:
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reduces the braking pressure to a safe level.
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is installed in the first tank the air compressor pumps air to.
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keeps air from going out if the air compressor develops a leak.
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works the trailer brakes.
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2.
To operate a vehicle equipped with air brakes, you must pass the air brakes knowledge test. Why?
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If you don't, you will only receive a CDL permit.
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If you don't pass the air brakes test, you can't get a CDL.
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If you don't pass the air brakes test, you will be restricted to driving vehicles without air brakes.
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All trucks have air brakes.
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3.
If a load is 10 feet long, the minimum number of tie-downs required is:
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4
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3
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2
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1
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4.
Air tanks usually hold enough compressed air to allow the brakes to be used _________ even if the compressor stops working.
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for one day
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for 3 days
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for one stop
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several times
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5.
Which of the following is not a way to know when to change gears?
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Use road speed (mph)
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Use engine speed (rpm)
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Check that the pressure gauge shows normal oil pressure
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Watch your tachometer
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6.
The safety relief valve is usually set to open at ____ psi.
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50
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75
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150
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100
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7.
If you get stuck on the railroad tracks, the first thing you should do is:
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stay in your vehicle and call 911.
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scream for help.
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try to move your vehicle until you see the train.
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immediately get out of the cab and move away from the tracks.
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8.
Why should you check your mirrors regularly to know where other vehicles are around you?
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To flash the brake lights if you are being tailgated.
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To know whether you can make a quick lane change in an emergency.
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To better assess your own speed.
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To move out of their way if they want to get past.
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9.
The trailer hand valve should:
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never be used for parking.
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be used in driving.
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never be used to test the trailer brakes.
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All of the above.
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10.
Air tank drains:
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are used to move air to the brakes.
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protect the tanks and the rest of the system from too much pressure.
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are used to remove water and oil from the air tanks.
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should not be used in wet weather.
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