CDL Air Brakes Practice Test - Oregon
11.
You should NOT use the parking brakes if:
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the brakes are very hot.
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the brakes are cold.
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the brakes are too dry.
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All of the above.
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12.
Air storage tanks:
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use parts of the service brake systems to stop the vehicle in a brake system failure.
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are installed in the first tank the air compressor pumps air to.
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pump air into the air storage tanks.
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hold compressed air for the brakes.
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13.
A passive railroad crossing is one that:
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has a traffic control device installed at the crossing to regulate traffic.
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requires you to stop and wait until the traffic control device installed at the crossing tells you to proceed.
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does not have any type of traffic control device.
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has at least two traffic control devices installed at the crossing to regulate traffic.
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14.
Most heavy vehicles require ________ change gears.
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double clutching
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triple shifting
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double shifting
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single clutching
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15.
When going down a steep downgrade, you should:
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use escape ramps whenever possible.
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use a low gear, and a proper braking technique.
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avoid braking and rely on engine braking.
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use the parking brake.
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