Automotive Engineering Final Exam Study Guide 100% Correct!!
Proton exchange membrane fuel cells can use not only hydrogen but also other hydrocarbons to produce electricity. T or F - ANSWER False Compared to internal combustion engines, the external combustion engines have quicker and more accurate control on engine load and speed thanks to their simple structure and flexibility on fuel type. T or F - ANSWER False Which of the following statements holds true for the ideal Otto cycle (theoretical) during combustion? - ANSWER Constant Volume Describe at least four challenges for fuel cell electric vehicles. - ANSWER cost problem, hydrogen storage, reliability, durability, water management, Infrastructure Which of the following statements regarding gasoline/diesel engine holds true? A. gasoline engine does not require a spark plug for combustion. B. conventional diesel combustion is governed by diffusion flame (heterogeneous combustion). C. typical diesel engines have lower compression ratio than gasoline engines due to engine knocking. D. diesel fuel is very volatile, so it ignites at lower pressure and temperature than gasoline fuel. - ANSWER B What is the thermal efficiency of an air-standard Diesel cycle operating with a compression ratio (r) of 20:1 and a cut-off ratio (rc) of 1.5? Use ratio of specific heats (k=1.4) - ANSWER 67%
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