mech4830_final_exam_sample - STUDENT NAME NUMBER DALHOUSIE UNIVERSITY Department of Mechanical Engineering MECH 4830 Reciprocating Internal Combustion

mech4830_final_exam_sample - STUDENT NAME NUMBER DALHOUSIE...

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STUDENT NAME: NUMBER: DALHOUSIE UNIVERSITY Department of Mechanical Engineering MECH 4830 Reciprocating Internal Combustion Engines FINAL EXAMINATION – DECEMBER 12th, 2005, DURATION: 2h 30 min. Observations: All questions are of equal value (25%). Choose only four (out of five) and indicate clearly which ones are to be marked. This exam is open books and notes given out in class. No solved problems allowed. If the problem statement is unclear or you have doubts, describe your assumptions and proceed. During the exam no questions will be answered. Please use these sheets for your solutions. You may use the back of the pages. 1. (25%)A twin cylinder two stroke engine has a swept volume of 150 cm 3 . The maximum power output is 19 kW at 11,000 rpm. At this condition the bsfc is 0.11 kg/MJ and the mass AF ratio is 12:1. If ambient test conditions are 10 C and 1.03 bar, and the fuel has a calorific value of 44 MJ/kg, calculate: a. The bmep b. The overall efficiency c. The volumetric efficiency.
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2 MECH 4830 – FINAL EXAMINATION – December 12 th , 2005
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2. (25%)
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