Question

For the same values of peak pressure, peak temperature and heat rejection, the correct order of efficiencies for Otto, Dual and Diesel cycles is
1. η_Otto > η_Dual > η_Diesel 
2. η_Dual > η_Diesel > η_Otto
3. η_Disel > η_Dual > η_Otto
4. η_Disel  > η_Otto > η_Dual

Answer 1

Correct Answer - Option 3 : η_Disel > η_Dual > η_Otto

For same values of peak pressure and temperature. Diesel cycle is most efficient and Otto cycle is least. Efficiency of dual cycle lies in between.

η_Diesel > η_Dual > η_Otto

And for same compression ratio and heat rejection or heat addition,

ηOtto > ηDual > ηDiesel