June 10th, 2007, 08:10 AM  #1 
Newbie Joined: Jun 2007 Posts: 3 Thanks: 0  Need Some Help
The exhaust temperature of a Carnot heat engine is 350°C. What is the intake temperature if the efficiency is 25.0%? 400°C 543°C. 558°C 830°C 
July 30th, 2007, 07:10 AM  #2 
Global Moderator Joined: Dec 2006 Posts: 19,953 Thanks: 1842 
The absolute temperature ratio equals 1  the efficiency, i.e., 75%, so the answer is approximately 558°C.
