Question

Cycle where heat is supplied at constant volume and rejected at constant pressure is called as :

• A. Dual cycle
• B. Otto cycle
• C. Atkinson cycle
• D. Diesel cycle

Hint:

Remember the heat addition and rejection states for standard cycles:
- Otto: \( V = \text{const} \), \( V = \text{const} \)
- Diesel: \( P = \text{const} \), \( V = \text{const} \)
- Atkinson: \( V = \text{const} \), \( P = \text{const} \)

Answer 1

The Correct Option is C

Step 1: Understanding the Concept:
Thermodynamic power cycles use different combinations of processes (isothermal, isentropic, isobaric, isochoric) to convert heat into mechanical work.

Step 2: Detailed Explanation:
Let us identify the characteristics of the listed cycles:
- Otto cycle: Heat addition is at constant volume (isochoric), and heat rejection is at constant volume (isochoric).
- Diesel cycle: Heat addition is at constant pressure (isobaric), and heat rejection is at constant volume (isochoric).
- Dual cycle: Heat addition is partly at constant volume and partly at constant pressure, and heat rejection is at constant volume.
- Atkinson cycle: In its ideal cycle form, heat is supplied at constant volume (isochoric) and rejected at constant pressure (isobaric).
This cycle features a larger expansion ratio than its compression ratio, enhancing efficiency.
Therefore, the correct option is Atkinson cycle.

Step 3: Final Answer:
The cycle where heat is supplied at constant volume and rejected at constant pressure is the Atkinson cycle.