2. (a) Define the physical processes which comprise the four stroke cycle AND Define the thermodynamic processes of the air stan- dard cycle which comprise the Otto cycle. (b) A diesel engine has a compression ratio of 18 and a cut off ratio of 2.4. At the beginning of the compression process, the air in the cylinder is at 100kPa and 27°C. Assume the gas constant, R = 287J/kgK, the specific heat at constant volume, Cy 718J/kgk, and the ratio of specific heats,= 1.4. Calculate; i The temperature after the heat addition process = ii The maximum pressure in the cylinder iii The work done by the cycle per unit mass iv The thermal efficiency of the engine v The mean effective pressure (c) Describe, using fewer than 50 words each what is meant by the following terms describing diesel engine combustion; i Delay Period. ii Uncontrolled burning. iii Controlled burning. iv Cut off ratio.

2. (a) Define the physical processes which comprise the four stroke cycle AND Define the thermodynamic processes of the air stan- dard cycle which comprise the Otto cycle. (b) A diesel engine has a compression ratio of 18 and a cut off ratio of 2.4. At the beginning of the compression process, the air in the cylinder is at 100kPa and 27°C. Assume the gas constant, R = 287J/kgK, the specific heat at constant volume, Cy 718J/kgk, and the ratio of specific heats,= 1.4. Calculate; i The temperature after the heat addition process = ii The maximum pressure in the cylinder iii The work done by the cycle per unit mass iv The thermal efficiency of the engine v The mean effective pressure (c) Describe, using fewer than 50 words each what is meant by the following terms describing diesel engine combustion; i Delay Period. ii Uncontrolled burning. iii Controlled burning. iv Cut off ratio.

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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