An Otto cycle with air as the working fluid has a compression ratio of $10.4 .$ Under cold-air-standard conditions, the thermal efficiency of this cycle is $(a) 10$ percent (b) 39 percent $(c) 61$ percent $(d) 79$ percent $(e) 82$ percent
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4$ and specific heat ratio $\gamma = 1.4$. Show more…
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An air-standard Otto cycle has a compression ratio of $7.5$. At the beginning of compression, $p_{1}=85 \mathrm{kPa}$ and $T_{1}=32^{\circ} \mathrm{C}$. The mass of air is $2 \mathrm{~g}$, and the maximum temperature in the cycle is $960 \mathrm{~K}$. Determine (a) the heat rejection, in $\mathrm{kJ}$. (b) the net work, in $\mathrm{kJ}$. (c) the thermal efficiency. (d) the mean effective pressure, in $\mathrm{kPa}$.
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The compression ratio of an Otto cycle, as shown in Figure $22.13,$ is $V_{A} / V_{B}=8.00 .$ At the beginning $A$ of the compression process, 500 $\mathrm{cm}^{3}$ of gas is at 100 $\mathrm{kPa}$ and $20.0^{\circ} \mathrm{C}$ . At the beginning of the adiabatic expansion the temperature is $T_{C}=750^{\circ} \mathrm{C}$ . Model the working fluid as an ideal gas with $E_{\text { int }}=n C_{V} T=2.50 n R T$ and $\gamma=1.40 .$ (a) Fill in the table below to follow the states of the gas:
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