Why is the compression ratio of the Otto cycle lower than that of the diesel cycle?

The simple answer is ,In the otto the energy available is fully used to raise the pressure in the cylinder. Higher the pressure implies larger work done. But in diesel cycle, Part of the energy is added only during the expansion, So it does not contribute to the work.

Which cycle has the lowest efficiency for the same compression ratio and heat rejection?

The cycle which has the least heat rejected will have the highest efficiency. Thus, the Otto cycle is the most efficient and the Diesel cycle is the least efficient of the three cycles.

Which cycle is more efficient for the same compression ratio and heat input?

For the same heat input & compression ratio, efficiency of Otto cycle is higher than that of diesel cycle, because in Otto cycle.

What is the effect of compression ratio on efficiency?

As the compression ratio increases, the fuel mixture is sufficiently compressed thereby increasing the thermal efficiency, so that less fuel is required to produce the same amount of energy. Fuel consumption is reduced at higher compression ratios between 8 and 9.

Which of the following is the relation between compression ratio expansion ratio and cut off ratio?

Which of the following is the relation between compression ratio, expansion ratio and cut-off ratio? Explanation: Here rk=compression ratio, re=expansion ratio and rc=cut-off ratio. 7.

Why the efficiency of a Otto cycle depends only on the compression ratio?

A higher compression ratio permits the same combustion temperature to be reached with less fuel while giving a longer expansion cycle. This creates more mechanical power output and lowers the exhaust temperature.

Why Otto cycle has higher efficiency?

Although for a given compression ratio the Otto cycle has higher efficiency, because the Diesel engine can be operated to higher compression ratio, the engine can actually have higher efficiency than an Otto cycle when both are operated at compression ratios that might be achieved in practice.

Why is Otto cycle more efficient than Diesel cycle for the same compression ratio and heat input in Otto cycle?

Otto cycle efficiency is higher than Diesel cycle efficiency for the same compression ratio and heat input because, in Otto cycle. Combustion is at constant volume. Expansion and compression are isentropic. Maximum temperature is higher.

Why is Otto cycle more efficient?

Why is Otto cycle more efficient than diesel cycle for the same compression ratio and heat input in Otto cycle?

Why does increasing compression ratio increase efficiency?

How does compression ratio affect thermal efficiency of Otto cycle?

The influence of compression ratio and specific-heat ratio on the thermal efficiency of the Otto cycle is shown in Fig. 3. For a given specific-heat ratio, thermal efficiency increases dramatically with increasing compression ratio at low values of r.

Is it possible for a demand curve to have a constant slope?

It is possible, however, for a demand curve to have constant price elasticity of demand, but these types of demand curves will not be straight lines and will thus not have constant slopes.

Why are there limits to the compression ratio of conventional engines?

This places practical limits on the compression ratio due to preignition of hydrocarbon fuels commonly used in SI engines. Consequently, conventional SI engines are seldom designed with compression ratios greater than 10. This factor will be fully addressed in Section IV.A.

How does the linearity of the compression curve change after each wash?

The linearity of the compression curve decreases for the second wash then increases until the sixth wash. The linearity of the compression curve becomes almost constant after six washing cycles.