Question When starting an engine as part of a pre-trip inspection, the driver should: Answers Listen for unusual noises. Place the engine in first gear. Turn on the heater. Explanation Check your engine during the pre-trip inspection. After starting the engine, you should listen for unusual noises. This questions appears in the following tests: Alaska Class B Knowledge Test Arkansas Double Connecticut Tank Kentucky Class B Knowledge Test New Hampshire Double New Mexico Class B Knowledge Test Oklahoma Class A Knowledge Test South Dakota Class B Knowledge Test