As part of the vehicle inspection test, a CDL applicant may be asked to: Question As part of the vehicle inspection test, a CDL applicant may be asked to: Answers Check the engine oil level. Replace a tire. Remove the alternator belt. Explanation When checking the engine compartment during the vehicle inspection test, you will need to check the engine oil level. This questions appears in the following tests: California Class B Knowledge Test Hawaii Class B Knowledge Test Kentucky Class B Knowledge Test Louisiana Class A Knowledge Test Maine Class A Knowledge Test Maine Class B Knowledge Test Missouri Class A Knowledge Test Missouri Tank Ohio Class B Knowledge Test Oregon Class B Knowledge Test Tennessee Class B Knowledge Test Utah Class A Knowledge Test