An Otto cycle with a compression ratio of 10.5 begins its compression at 90 kPa and 358C.

Question:

An Otto cycle with a compression ratio of 10.5 begins its compression at 90 kPa and 358C. The maximum cycle temperature is 10008C. Utilizing air-standard assumptions, determine the thermal efficiency of this cycle using
(a) Constant specific heats at room temperature
(b) Variable specific heats.
(a) 61.0 percent
(b) 57.7 percent