Question 1
A company that produces pulsed gas heaters claims their efficiency is approximately 90%. If an engine operates between 250°C and 25°C, what is its maximum thermodynamic efficiency?
◦
83%
◦
65%
◦
43%
◦
90%
◦
56%
Question 2
A gasoline engine absorbs 2 500 J of heat and performs 1 000 J of mechanical work in each cycle. The efficiency of the engine is
◦
80%
◦
40%
◦
60%
◦
20%
◦
50%