Question A tank endorsement is: Answers Only required when transporting gases. Only required when transporting liquids. Used when transporting both liquids and gases. Optional when transporting hazardous materials. Explanation In general, a tank endorsement is required to a drive tank vehicle used to transport liquids or gases. This applies to both hazardous and non-hazardous materials. This questions appears in the following tests: Florida Class B Knowledge Test Massachusetts Air Brakes Nebraska Air Brakes New Jersey Class B Knowledge Test New Jersey Air Brakes Pennsylvania Air Brakes South Carolina Air Brakes Tennessee Passenger Utah Air Brakes Wisconsin Air Brakes