2.1The manufacture of Earldom generator decided to make the system more stronger by connecting part A (0.1), part B (0.4) and part C (0.6) in series. These parts forms the engine. They also connected part D(0.7) and part E(0.3) in series. These components forms an alternator. To make the system complex they connected the engine and the alternator in parallel. a) Draw the reliability model of this system b) Calculate the reliability of this generator. 2.2 Briefly explain how tribology reduces maintenance cost. 2.3 Provide two tasks that can eliminate wear on the equipment. (6) 2.4 What is the main purpose of design-out maintenance? (2) [21]