An air standard Otto cycle has a compression ratio of 8 and temperature and pressure at the begining of compression are ${20}^{0}C$ and 1 bar respectively . The constant volume heat addition is 1800 kJ/kg . Take $C_V$ = 0.718 and y = 1.4 . The maximum pressure for the cycle is :

Q. In an ideal Otto cycle the air at the beginning of isentropic compression is at 1 bar and ${15}^{0}C$ .The compression ratio is 8 . If heat added during the constant volume process is 1000 kJ/kg . What is the maximum temperature attained by Otto cycle ? ( Take $C_v$ =0.718 and γ =1.4 )

Q. An air-standard dual cycle has a compression ratio of 10. The pressure and temperature at the beginning of compressing are 1 bar and 27${}^{\circ }$C. The temperature after constant volume heat addition is 987${}^{\circ }$C and ned heat supplied to the cycle is 878 kJ/kg. What will be the cut-off ratio of the cycle?



$[Take:c_p=1.004kJ/kgKand{c}_v=0.717kj/kgKand\gamma =1.4]$

Q. In an Otto cycle, air is compressed adiabatically from ${27}^{o}C$ and 1 bar to 12 bar. heat is supplied at constant volume until the pressure rises to 35 bar. For the air $\gamma =1.4,c-v=0.718kJ/kgK$ and R=0.2872 kJ/kgK. What is mean effective pressure of the cycle?

Q. An oil engine working on dual engine cycle takes air at 1.0 bar and ${16}^{\circ }C$. The maximum cycle pressure is 60 bar. The compression ratio is 14:1. The heat addition at constant pressures equal to heat addition at constant volume. What is the air standard efficiency of the cycle?

Q. In an air standard Otto cycle the net work is 1000 kJ/kg and the maximum temperature in the cycle is 3200 K. The temperature at the end of the compression is 800K $C_v=0.718kJ/kg.K,C_p=1kJ/kg.K,\gamma =1.4)$ The thermal efficiency of the cycle is ________%