Michigan Commercial Driver's License (CDL) Practice Exam

Which statement about engine belts in hot weather is NOT true?

1. Cracking is likely to occur but is not a safety threat.

2. Belts should be checked regularly for wear.

3. Hot weather may cause belts to expand.

4. All belts are equally affected by temperature.

The correct answer is: Cracking is likely to occur but is not a safety threat.

The statement that cracking is likely to occur but is not a safety threat is incorrect because, while cracking in engine belts can indeed occur due to the stress of hot weather, this issue can pose significant safety risks. If a belt cracks severely enough, it can break, which may lead to loss of power steering, overheating, or failure of other vital systems in the vehicle. Therefore, while cracking can happen, it is important to recognize that it can ultimately become a safety threat, especially for a commercial vehicle driver who relies on the proper functioning of all engine components. In contrast, checking belts regularly for wear is a critical maintenance practice to ensure that any potential issues, including cracking, can be identified and addressed before they lead to failures. Understanding that hot weather can cause belts to expand is also important, as this expansion can affect tension and alignment, impacting the belts' operation. Lastly, the notion that all belts are equally affected by temperature does not hold true; different belts may have varying degrees of susceptibility based on their material and function. Hence, it's vital for drivers to fully understand the condition of their vehicle's belts, especially when faced with extreme temperatures.