# 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_____________

## Question ID - 156525 :- 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_____________

3537

Answer Key : (1.30 to 1.39) -

1.30 to 1.39

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A tractor drawn five-tine sweep type cultivator is set at an angle (load angle) of $45^{\circ}$ with the soil surface during its operation. The sweep of each tine experiences a normal force of $960 \mathrm{~N}$ on its surface. If the coefficient of soil-metal friction is $0.3,$ the total draft requirement of the cultivator is____________ $\mathrm{kN}$ 