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Academics – Applied Heat : 2017/OCT/02
Question

Q2. The air standard efficiency of Otto cycle is 68.73 % and the indicated mean effective pressure is 5 bar.

The minimum pressure and temperature in the cycle are 1.05 bar and 30℃respectively.

(a) Sketch The cycle on pressure-Volume and Temperature-specific entropy diagrams (2)

(b) Calculate EACH of the following:

(i) The volume compression ratio; (2)

(ii) The specific work output; (4)

(iii) The maximum cycle temperature; (6)

(iv) The maximum cycle pressures. (2)

Note: for air, γ = 1.4 and cv = 718 J⁄(kg K) .

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