Examination Paper: Fluid Mechanics, MECH7006, Summer 2011, Cork Institute of Technology, Exams of Fluid Mechanics

Download Examination Paper: Fluid Mechanics, MECH7006, Summer 2011, Cork Institute of Technology and more Exams Fluid Mechanics in PDF only on Docsity! CORK INSTITUTE OF TECHNOLOGY INSTITIÚID TEICNEOLAÍOCHTA CHORCAÍ Semester 2 Examinations 2010/11 Module Title: Fluid Mechanics Module Code: MECH7006 School: Mechanical & Process Engineering Programme Title: Bachelor of Engineering (Honours ) in Mechanical Engineering Bachelor of Engineering (Honours) in Structural Engineering Bachelor of Engineering (Honours) in Biomedical Engineering Programme Code: EMECH_8_Y2 CSTRU_8_Y2 EBIOM_8_Y2 External Examiner(s): Mr. John J. Hayes, Prof. Robin Clarke Internal Examiner(s): Paul D O’Sullivan Instructions: Attempt any three questions. (33 marks each) Duration: 2 hours Sitting: Summer 2011 Requirements for this examination: Note to Candidates: Please check the Programme Title and the Module Title to ensure that you have received the correct examination paper. If in doubt please contact an Invigilator. Q1 a) A Buoy floating in sea water of density is conical in shape outlined in Fig Q1. Its mass is and its centre of gravity is from the vertex. A flashing beacon is to be fitted to the top with a mass of .What is the maximum height of its centre of gravity above the top of the buoy if the whole assembly is not to be unstable. (The centre of volume of a cone of height h is at a distance 3/4 h from the vertex). (13 marks) b) Derive an expression for the magnitude and direction of the resultant force on a horizontal reducing pipe bend which deflects the flow of a fluid through an angle , if at entry the pressure is , area , and velocity and at the exit the corresponding values are , , and . (10 marks) c) Ethanol with a specific gravity of 0.81 enters the reducing bend shown in Fig. Q3 with a velocity of and a pressure of . The bend is in a horizontal plane. Calculate the x and y forces required to hold the bend in place. Neglect energy losses in the bend. (10 marks)