Which one of the following is not possible in a cyclic process?

Options

A. Work done by the system is positive
B. Heat added to the system is positive
C. Wok done on the system is positive
D. Heat removed from the system is negative

Explanation

To determine which statement is not possible in a cyclic process, we need to analyze the four options provided. Let's break down the concepts involved in a cyclic process in thermodynamics.

### Step-by-Step Solution:

1. **Understanding a Cyclic Process**:
- A cyclic process is one where the system returns to its initial state after a series of changes. In a PV diagram, this is represented by a closed loop.

2. **Work Done in a Cyclic Process**:
- The work done by the system during a cyclic process can be positive or negative depending on the direction of the process on the PV diagram. If the process moves in a clockwise direction, the work done by the system is positive. If it moves counterclockwise, the work done on the system is positive.

3. **Heat Transfer in a Cyclic Process**:
- Heat added to the system is considered positive, while heat removed from the system is considered negative.

4. **Evaluating the Options**:
- Let's analyze each option based on the principles of thermodynamics:
- **Option A**: Work done by the system is positive.
- This is possible in a cyclic process if the process is clockwise.
- **Option B**: Heat added to the system is positive.
- This is also possible as heat can be added during the process.
- **Option C**: Work done on the system is positive.
- This is not possible in a cyclic process because if work is done on the system, it means the system is gaining energy, which contradicts the cyclic nature where the system returns to its original state.
- **Option D**: Heat removed from the system is negative.
- This is true as heat removed is considered negative.

5. **Conclusion**:
- The statement that is not possible in a cyclic process is **Option C: Work done on the system is positive**.

### Final Answer:
**The correct option is C: Work done on the system is positive.**