Download Fall 2010/11 Exams in Facilities & Environmental Engineering at Cork IT and more Exams Materials science in PDF only on Docsity! Page 1 of 3 CORK INSTITUTE OF TECHNOLOGY INSTITIÚID TEICNEOLAÍOCHTA CHORCAÍ Autumn Examinations 2010/11 Facilities & Environmental Engineering Module Code: MECH 8006 School: Mechanical & Process Engineering Programme Title: BSc (Honours) in Advanced Manufacturing Technology BSc (Honours) in Process Plant Technology Programme Code: EAMTE_8_Y4 EPPTE_8_Y4 External Examiner(s): Mr. P. Ryan, Mr. G. Reilly Internal Examiner(s): Michael P O’Mahony Instructions: Answer THREE Questions Duration: 2 hours Sitting: Autumn 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. Page 2 of 3 Q1. (a) Explain: Apparent Power, Active Power, Reactive Power and Power Factor. Stating their relationship, how they are measured and tariffs imposed by the ESB. (12 Marks) (b) A level pathway joins two buildings. It is illuminated by three 800cd lamps mounted in a straight line 6 m apart and 2.5m about the path surface. Calculated the illuminance of the pathway halfway between two lamps. (6 Marks) (c) The LUMEN METHOD is frequently used in lighting installation design, and is expressed by: lumens MFUF AE Explain each of the terms used in the above equation (10 Marks) (d) A store room of 12x15m is lit by fluorescent tubes, 125W, with efficacy of 70lm/W. Assuming a MF of 0.7 and UF of 0.5, estimate the power consumption which will provide an average illumination level of 200 lx (5 Marks) Q2. (a) A double acting pneumatic cylinder with a bore of 100mm, a rod diameter of 32mm and a stroke of 300mm, operates at a pressure of 6 bar gauge on both extend and return strokes. If the cylinder makes 25 cycles per minute calculate the free air consumption. (5 Marks) (b) The compressed air demand from a facility usually varies significant through any given day. Explain the how this can be accomadated by the compressed air system (8 Marks) (c) A pneumatic ring main is supplies a plant with an average demand of 20m 3 /min FAD. The minimum working pressure at the receiver is 5 bar gauge. The air compressor has a rated delivery of 35 m 3 /min at a working pressure of 7 bar gauge. The controls switch the compressor off load when the receiver pressure reaches 7 bar gauge and back on when it drops to 5 bar gauge. If the max allowable compressor starts per hour is 20, determine a suitable receiver capacity (10 Marks) (d)Why is it necessary to DRY compressed air. Explain how water is removed from a compressed air system? (10 Marks)
