A diesel engine was tested for a continuous 3 hours of operation. It consumed at total of 5 liters and developed a constant power of 7.5 kW. If the fuel contains 45.46 MJ/kg, what is the approximate thermal efficiency?

A diesel engine was tested for a continuous 3 hours of operation. It consumed at total of 5 liters and developed a constant power of 7.5 kW. If the fuel contains 45.46 MJ/kg, what is the approximate thermal efficiency?

Automotive Technology: A Systems Approach (MindTap Course List)

6th Edition

ISBN:9781133612315

Author:Jack Erjavec, Rob Thompson

Publisher:Jack Erjavec, Rob Thompson

Chapter9: Automotive Engine Designs And Diagnosis

Section: Chapter Questions

Problem 3RQ: As an engines compression ratio increases, what should happen to the octane rating of the gasoline?

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Question

2. A diesel engine was tested for a continuous 3 hours of operation. It consumed at total
of 5 liters and developed a constant power of 7.5 kW. If the fuel contains 45.46
MJ/kg, what is the approximate thermal efficiency?
a. 40%
b. 35%
c. 33%
d. 25%
e. none of the above

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