Exam Questions: Thermofluids1 for Engineering Students, Exams of Physics Fundamentals

Download Exam Questions: Thermofluids1 for Engineering Students and more Exams Physics Fundamentals in PDF only on Docsity! Page 1 of 4 CORK INSTITUTE OF TECHNOLOGY INSTITIÚID TEICNEOLAÍOCHTA CHORCAÍ Autumn Examinations 2008/09 Module Title: Thermofluids1 Module Code: MECH 6007 School: Mechanical and Process Engineering Programme Title: B.Eng in Building Services Engineering B.Eng in Biomedical Engineering B.Eng (Hons) in Sustainable Energy Technology B.Eng (Ord) in Mechanical Engineering Programme Code: EBSEN_7_Y1, EBIME_7_Y1, ESENT_8_Y1, EMECH_7_Y1 External Examiner(s): Mr. Paul O’Sullivan, Dr. Mervyn Smyth, Dr. Eugene Coyle, Dr. Garrett McGuinness, Dr. Murtagh Murphy Internal Examiner(s): Dan O’Brien, Sean Williams, Maria Kavanagh, Sally Bryan Instructions: Answer any 4 questions Duration: 2 hours Sitting: Autumn 2009 Requirements for this examination: Log tables, Steam tables Note to Candidates: Please check the Programme Title and the Module Title to ensure that you are attempting the correct examination. If in doubt please contact an Invigilator. Page 2 of 4 Q. 1 Pressure a) State the meaning of a negative gauge pressure. (3 marks) b) Draw a diagram of a barometer and briefly discuss how it measures atmospheric pressure. (5marks) c) The level of mercury in a barometer tube is 760mm above the level of mercury in the bowl. What is the atmospheric pressure if the relative density of mercury is 13.6? (5 marks) d) A storage tank 1.5m wide has two compartments separated by a vertical partition across the full width. One side contains water to a depth of 2.4m and the other side contains oil to a depth of 3m. Find the resultant horizontal force on the partition. (12 marks) ρoil = 750kg/m3 and the ρwater = 1000kg/m3 Q. 2 Buoyancy a) State the equation and SI unit for mass density. (3 marks) b) The density of a substance may be quoted as a relative density. Why is relative density useful? If a body had a relative density of 2 state its mass density.(4 marks) c) A rectangular pontoon 12m long, 6m wide has a draught (depth under water) of 1.5m in fresh water. Calculate, i. The weight of the pontoon. (6 marks) ii. The draught in seawater. (6 marks) iii. The mass of cargo that can be loaded in fresh water if maximum allowable draught is 2m. (6 marks) ρseawater = 1025kg/m3 and ρfresh water = 1000kg/m3.