In which of the following air standard cycle, heat is added partly at constant volume and partly at constant pressure?

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  1. Lenoir Cycle
  2. Dual Cycle
  3. Diesel Cycle 
  4. Otto Cycle 

Answer (Detailed Solution Below)

Option 2 : Dual Cycle
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Detailed Solution

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Explanation:

The Dual Cycle, also called a mixed cycle or limited pressure cycle, is a compromise between Otto and Diesel cycles.

Dual cycle is a thermodynamic cycle that combines the Otto cycle and the Diesel cycle. In this cycle the heat addition occurs partly at constant volume and partly at constant pressure.

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Different processes in the dual cycles are given below:

Process 1-2: Reversible adiabatic compression.

Process 2-3: Constant volume heat addition.

Process 3-4: Constant pressure heat addition.

Process 4-5: Reversible adiabatic expansion.

Process 5-1: Constant volume heat rejection.

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