AIR BRAKES PRACTICE TEST - IOWA
21.
Antifreeze:
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helps the engine only when the temperature is below freezing.
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helps the engine only under hot conditions.
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helps the engine under hot conditions as well as cold conditions.
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22.
Excessive use of the service brakes results in overheating and leads to:
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brake fade.
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reduction of the brake drums.
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poor traction.
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23.
Front-end header boards:
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protect drivers from spilled cargo.
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protect drivers from cargo in case of an accident or emergency stop.
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should never be used.
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24.
Before transporting sealed loads, you should check that:
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the seal numbers match the placard numbers.
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the load is properly secured.
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the load can be inspected.
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25.
In vehicles with air brakes, the two markings on a front brake limiting valve are:
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normal and slippery.
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high and low.
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left and right.
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