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UPGRADE TO CDL PREMIUM
1.
Too little weight on the driving axles can cause:
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poor visibility.
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longer stopping distances.
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mechanical damage.
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poor traction.
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2.
Banked curves:
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are reserved for pedestrians.
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should always be avoided.
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have a safe "design speed".
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can be taken at any speed.
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3.
Tractor and straight truck spring brakes will come fully on when the air pressure drops to a range of:
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30 to 35 psi.
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55 to 74 psi.
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20 to 45 psi.
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5 to 15 psi.
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4.
When the low air pressure warning light and buzzer first come on, you should:
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immediately put alcohol into the air system.
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downshift and slow down.
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bring the vehicle to a safe stop right away.
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speed up to restore pressure.
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5.
The trailer hand valve should:
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never be used for parking.
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never be used to test the trailer brakes.
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be used in driving.
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All of the above.
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6.
Stepping on and off the brake pedal several times:
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may result in dangerously thin linings.
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may cause air leaks.
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reduces the air pressure in the tanks.
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All of the above.
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7.
You supply air to the trailer brake system by:
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pulling out the trailer air supply valve.
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connecting the tractor service air line to the trailer service glad hand.
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plugging the electrical cord into the trailer.
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pushing in the trailer air supply knob.
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8.
Brake drums or discs must not have cracks longer than ____ the width of the friction area.
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1/2
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1/5
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1/4
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1/3
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9.
Parking brakes are:
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not required on trailers.
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not required on buses.
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required on all vehicles.
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not required on commercial vehicles with air brakes.
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10.
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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