In a carnot engine, when heat is absorbed from the source, its temperature

Options

A. Increases
B. Decreases
C. Remains same
D. Cannot be predicted

Answer

To solve the question regarding the temperature change in a Carnot engine when heat is absorbed from the source, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Carnot Engine**:
- A Carnot engine operates in a cyclic process and consists of two isothermal processes (one for heat absorption and one for heat rejection) and two adiabatic processes (one for expansion and one for compression).

2. **Identifying the Processes**:
- The processes in the Carnot cycle are:
- **Process AB**: Isothermal expansion (heat is absorbed from the hot reservoir).
- **Process BC**: Adiabatic expansion (work is done by the system).
- **Process CD**: Isothermal compression (heat is rejected to the cold reservoir).
- **Process DA**: Adiabatic compression (work is done on the system).

3. **Analyzing the Isothermal Expansion (Process AB)**:
- During the isothermal expansion (Process AB), the Carnot engine absorbs heat (QH) from the hot reservoir at a constant temperature (TH).
- Since this process is isothermal, the temperature of the system does not change; it remains constant throughout the process.

4. **Conclusion**:
- Therefore, when heat is absorbed from the source in a Carnot engine, the temperature of the source (TH) remains the same.

5. **Final Answer**:
- The correct option is that the temperature remains the same.