Practice question What is outage, also called ullage? Space left in a tank for liquid expansionA solid wall inside a tankA tire tread depthA CDL retest fee Answer: A — Space left in a tank for liquid expansion The correct answer is shown above. Try the full quiz for additional practice. Practice more: Virginia CDL Tanker Test Practice Questions - Virginia Commercial Driver License (CDL) Tanker Vehicles Endorsement Test Exam →