1(d). The brake fuel conversion efficiency of an engine is 30%. The mechanical and combustionefficiencies are 80% and 94%, respectively. The heat losses to the oil and coolant are 60 kW.The chemical energy of the fuel entering the engine is 190 kW. What percentage of thisenergy becomes (a) brake power; (b) friction power; (c) heat losses; (d) exhaust chemicalenergy; (e) exhaust sensible energy?

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Answered: 04%, respectively. The the fuel…

Engineering

Mechanical Engineering

04%, respectively. The the fuel entering the e e power: (b) friction

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 1RQ

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Concept explainers

Entropy

In physics, entropy means the amount of disorder or the degree of randomness associated with a thermodynamic system. The system is not self-organized when the entropy of the system is high. For instance, when a system is at an elevated temperature, its molecules are in random motion, vibrating and colliding with each other. During this scenario, the probability of finding a molecule at a particular place twice, is low. Under this circumstance, the system can be said to be in a high entropy.

Question

1(d). The brake fuel conversion efficiency of an engine is 30%. The mechanical and combustion
efficiencies are 80% and 94%, respectively. The heat losses to the oil and coolant are 60 kW.
The chemical energy of the fuel entering the engine is 190 kW. What percentage of this
energy becomes (a) brake power; (b) friction power; (c) heat losses; (d) exhaust chemical
energy; (e) exhaust sensible energy?

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