The mechanical friction mean effective pressure of a 4-cylinder Sl engine has a quadratic function with a = 80, b = 95 and c = 130. Three measurements have been done at three different engine rotational speeds N. The amep is found equal to 12.3, 21.4 and 28.7 kPa and the pmep is found equal to 25, 63.55 and 107.6 kPa at N equal to 2200, 4500 and 6500 rpm respectively. If the net indicated mean effective pressure is equal to 558.2 kPa at N = 3740 rpm, the mechanical efficiency is equal to (%): Select one: O a. 71 O b. 84 O c. 87 O d. 76 O e. 91 The mechanical friction mean effective pressure of a 4-cylinder Sl engine has a quadratic function with a = 80, b = 95 and c = 130. Threemeasurements have been done at three different engine rotational speeds N. The amep is found equal to 12.3, 21.4 and 28.7 kPa andthe pmep is found equal to 25, 63.55 and 107.6 kPa at N equal to 2200, 4500 and 6500 rpm respectively. If the net indicated meaneffective pressure is equal to 558.2 kPa at N = 3740 rpm, the mechanical efficiency is equal to (%):Select one:O a. 71O b. 84O c. 87O d. 76O e. 91

Option C 87% is the correct answer.

Answered: The mechanical friction mean effective…

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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The mechanical friction mean effective pressure of a 4-cylinder Sl engine has a quadratic function with a = 80, b = 95 and c = 130. Three measurements have been done at three different engine rotational speeds N. The amep is found equal to 12.3, 21.4 and 28.7 kPa and the pmep is found equal to 25, 63.55 and 107.6 kPa at N equal to 2200, 4500 and 6500 rpm respectively. If the net indicated mean effective pressure is equal to 558.2 kPa at N = 3740 rpm, the mechanical efficiency is equal to (%): Select one: O a. 71 O b. 84 O c. 87 O d. 76 O e. 91