Topic: Theory of Machines
Determine the number of degrees of freedom used in the analysis of the mechanical system of below mentioned figure.

- A. 3
- B. 7
- C. 5
- D. 4
Answer: D. 4
Explanation: In the mechanism described by the problem context, there are independent motions that define the system's configuration. Specifically, there are two independent rotations of the pulleys and two independent vertical motions of the masses B and C. This results in a total of 4 degrees of freedom.