Question 1
In an engine operating in the Otto cycle, the final volume of the fuel-air mixture is one sixth the initial volume. Assume γ = 1.4. The maximum theoretical efficiency of this cycle, in per cent, is
◦
17.
◦
49.
◦
51.
◦
56.
◦
83.
Question 2
On a cold day, a heat pump absorbs heat from the outside air at 14°F (−10°C) and transfers it into a home at a temperature of 86°F (30°C). Determine the maximum κ of the heat pump.
◦
0.2
◦
4.4
◦
0.5
◦
7.6
◦
6.7