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.
2 MECH 4830 – FINAL EXAMINATION – December 12 th , 2005
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- Combustion, Internal combustion engine, Variable valve timing