PA Mining Law - Sections 404-406 (1) Practice test questions for the PA Mine Officials' Exam Progress Indicator: Question 1 of 16 1.  Each specific model of diesel powered equipment shall be approved by the department before it is taken underground.  The department shall require that an approval plate be affixed to each piece of the approved diesel powered equipment. Choices: The primary purpose of the equipment The date the current a approval expires The minimum amount of ventilation required before the equipment is used All of the above