Which of the following is NOT a pre-service test?

The correct option indicates that a routine maintenance test is not classified as a pre-service test. Pre-service tests are typically conducted to assess the readiness and performance of equipment before it is put into active use. Certification tests ensure that personnel meet specific qualifications, manufacturer's road tests evaluate the performance of apparatus as per the manufacturer's standards, and acceptance tests confirm that the equipment meets the contract specifications and is functional for its intended use.

In contrast, routine maintenance tests are performed to ensure that apparatus continues to operate effectively and safely during its service life. These tests are not about verifying readiness before first use but instead focus on ongoing performance and reliability during regular operations. Therefore, routine maintenance is a different category of testing that becomes relevant after equipment is already in service.