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Thermodynamics

Thermodynamics Miscellaneous
  1. An ideal air standard Otto cycle has a compression ratio of 8.5. If the ratio of the specific heats of air (γ) is 1.4, what is the thermal efficiency (in percentage) of the Otto cycle?
    1. 575
    2. 45.7
    3. 52.5
    4. 95
Correct Option: A

η = 1 -
1
rγ - 1

η = 1 -
1
(8.5)1.4 - 1

η = 1 -
1
 = 57.5
(8.5)0.4


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