Machine Systems Exam for Mechanical Engineering Students - Autumn 2008, Exams of Machine Design

Download Machine Systems Exam for Mechanical Engineering Students - Autumn 2008 and more Exams Machine Design in PDF only on Docsity! Cork Institute of Technology Bachelor of Engineering in Mechanical Engineering – Stage 2 (EMECH_7_Y2) Autumn 2008 Machine Systems (Time: 2.5 Hours) Instructions Answer TWO questions from Section A and TWO questions from Section B. All questions carry equal marks. Examiners: Mr. S Williams Mr. A Bateman Dr. P. Delassus Section A Q1. (a) Explain using diagrams two methods used to tension vee-belts. (6 Marks) (b) Describe causes of failure associated with timing belts, recommend a solution for each cause listed. (6 Marks) (c) Explain the term “Involute” in relation to spur gears. (3 Marks) (d) Identify and sketch two methods of mounting gears on shafts. (6 Marks) (e) Outline the different types of wear associated with gears. (4 Marks) Q2 (a) Describe the causes of failure common to many power transmission elements. (6 Marks) (b) Show using diagrams the difference between journal and thrust dynamic bearings. (5 Marks) (c) Explain the operation of the splash lubrication method, identify a practical example of this method. (6 Marks) (d) Differentiate between “Parallel Alignment” and “Angular Alignment”. (3 Marks) (e) Show using a cross-sectional diagram a multi plate clutch. (5 Marks) Q3 (a) Explain the term “Preventative Maintenance”. (4 Marks) (b) Identify and explain the factors which influence the selection of mechanical transmission elements in relation to machine design. (6 Marks) (c) List the procedures enacted when installing a gasket. (6 Marks) (d) Describe with the aid of diagrams the following terms: i. Packing ii. Lip Seal iii. Felt Seal (6 Marks) (e) Explain the term “Work Permit”. (3 Marks) Q6 (a) Sketch a fixed displacement hydraulic pump, label its working parts and describe its operation. (6 Marks) (b) Differentiate between the terms “filter” and “strainer”. . (4 Marks) (c) Explain the following terms used in hydraulic circuits design: i. Regenerative circuit ii. Sequence valve iii. Counterbalancing (6 Marks) (d) Identify and explain the factors which determine the micrometer rating of a filter. (4 Marks) (e) List the causes of cavitation common to hydraulic circuits. (5 Marks)