1. PF Contest - Win "Conquering the Physics GRE" book! Click Here to Enter
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Otto cycle engine

  1. Sep 2, 2015 #1
    1. The problem statement, all variables and given/known data

    An Engine works within Otto cycle where the compression ratio is 6, and 350 kJ of heat was added to it. Determine the efficiency of the cycle and the work done if Cp/Cv is 1.45

    2. Relevant equations
    Efficiency Otto = (1- r1-k)
    Efficiency (eff.) =Work (W) /Heat Transferred (Q)

    3. The attempt at a solution

    Efficiency Otto = (1- r1-k) ( r is the compression ratio, k is Cp/Cv)

    = 1-61-1.45

    = 0.5534 = 55.34% --> The efficiency of the cycle

    W=eff. * Q = 0.5534 * 350

    W=193.72 kJ --> The work done
    Last edited by a moderator: Sep 2, 2015
  2. jcsd
  3. Sep 3, 2015 #2


    User Avatar
    Homework Helper

    Your result looks fine, but use the "x2" button for an exponent. The efficiency is 1-r(1-k) instead of 1-r1-k and 1-61-1.45 is not 55.34%.
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted

Similar Threads - Otto cycle engine Date
Calculating work of Otto cycle stages - Thermodynamics. May 3, 2017
Otto Cycle Aug 26, 2016
Otto Cycle Engine Nov 10, 2013
Engine Cycles: Otto, Diesel and Carnot Dec 13, 2010
Thermodynamics Otto Cycle engine Apr 6, 2007