Why are exhaust leaks particularly dangerous?

a.They reduce fuel economy

b.Exhaust fumes can enter the cab and cause driver drowsiness or carbon monoxide poisoning

c.They make the vehicle louder

d.They are only a cosmetic issue

Explanation

Exhaust leaks are extremely dangerous because exhaust fumes, including carbon monoxide, can enter the cab. Carbon monoxide is odorless and colorless and can cause drowsiness, impaired judgment, unconsciousness, or death.

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About the CDL Exam

The CDL (Commercial Driver License) exam tests your knowledge of commercial driving rules, safety procedures, and vehicle operation. You must score 80% or higher to pass the written knowledge test. The exam covers general knowledge, air brakes, combination vehicles, and various endorsements.

This question is from the Class A CDL Knowledge Test #2 section. Practice with more questions from this category to build confidence before taking the official DMV test.

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