A reciprocating spark ignition engine takes Steve Gibbs @The Saylor

Question 12 / 33: A reciprocating, spark ignition engine takes in an air-fuel mixture at 20°C. It has a compression ratio of 12. The air-to-fuel ratio is 14, and the heating value of the fuel is 70,000 kJ/kg. For an air standard cycle analysis, what is the highest pressure reached? You may assume C_v is approximately 0.7 kJ/kg K and that k=Cp/Cv = 1.4.

A 2.34 atm

B 50 atm

C 23.4 atm

D 234 atm

E 325 atm

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Explanation:

For this problem, we simply use the ideal gas law. We know the initial condition of 293°K and 1 atm. If we assume that air is the working fluid, then P = P_initial (V_initial/V_final) (T_final/T_initial) = 1atm (12)(7934/293) = 325 atm.

Quiz Home Page

https://www.jobilize.com/thermal-fluid-systems-mcq-quiz-by-dr-steve-gibbs

Thermal-Fluid Systems ME303

Author:

Dr.Steve GibbsProfessor

The Saylor Foundation

USA

Access: Public Instant Grading

Attribution: Dr. Steve Gibbs. Thermal-Fluid Systems. The Saylor Academy 2014, http://www.saylor.org/courses/me303/

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