# A power tiller with diesel engine produces $12 \mathrm{~kW}$ of brake power with a brake thermal efficiency of $30 \%$. If the air-fuel ratio in the combustion process is 14: 1 and heating value of the fuel is $45 \mathrm{MJ} \mathrm{kg}^{-1}$, air consumption rate of the engine will be_________ $\mathrm{kg} \mathrm{h}^{-1}$

## Question ID - 156524 :- A power tiller with diesel engine produces $12 \mathrm{~kW}$ of brake power with a brake thermal efficiency of $30 \%$. If the air-fuel ratio in the combustion process is 14: 1 and heating value of the fuel is $45 \mathrm{MJ} \mathrm{kg}^{-1}$, air consumption rate of the engine will be_________ $\mathrm{kg} \mathrm{h}^{-1}$

3537

Answer Key : (44.50 to 45.00) -

44.50 to 45.00

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Air enters into an engine cylinder at a pressure of $100 \mathrm{kPa}$ and temperature of $300 \mathrm{~K}$ in the suction stroke of an ideal Otto cycle. The cylinder clearance volume is $600 \mathrm{~cm}^{3}$ and compression ratio is $8: 1 .$ The expansion stroke of the cycle is polytropic in nature. The pressure at the beginning of the expansion stroke is $10 \mathrm{MPa}$ and the temperature at the end of the expansion stroke is $1800 \mathrm{~K}$. The polytropic exponent of the expansion stroke is_____________