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Illinois CDL Practice Test: Tank - Test 4 2023

Instruction: To obtain this endorsement for hauling any liquid or gaseous materials in a tank or tanks, applicants must pass a 15-question test. And to pass the test, applicants must score at least 80%. Test questions are from the IL CDL Handbook. The Tanker Vehicles endorsement can be used with the Class A, B, or C CDL. If you need additional information, please contact your local DMV office. You can find your nearest DMV office at Illinois DMV locations.

1. A closed tractor protection valve ________.
A
Stops any air from going out of the tractor.
B
Let the air out of the trailer rear line.
C
Let the air in the trailer emergency line.
D
Allows air from going out of the tractor.
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