CDL AIR BRAKES PRACTICE TEST - IOWA
16.
When is it safe to leave your vehicle unattended without applying the parking brakes or chocking the wheels?
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When you are conducting your pre-trip inspection.
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Never.
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Only while you are taking a rest break.
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17.
In a dual-air system - with engine at operating RPM, the pressure should build from 85 to 100 psi within how many seconds?
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12
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20
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45
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18.
The safety relief valve is located:
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in the first tank the air compressor pumps air to.
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in the front brake.
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on each end of the vehicle's axles.
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19.
If your trucks has a high center of gravity, which of the following is true for curves?
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You should slow down, as your truck can roll over at the posted speed limit for the curve.
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Reduce your speed to a crawl.
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You should travel at the posted speed limit.
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20.
Most heavy duty vehicles use ___ air brake systems for safety.
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dual
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triple
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single
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