This document contains a question bank with questions about maintenance and troubleshooting for Unit 1. It includes two mark questions defining key terms like maintenance, corrective maintenance, preventive maintenance, and predictive maintenance. It also lists the major types of maintenance and functions of a maintenance engineering department. Three to six mark questions differentiate between corrective, preventive, and predictive maintenance and compare maintenance to troubleshooting work. Advanced troubleshooting techniques and the functions of a maintenance engineering department are also discussed.