Calculate the following: 11.1.1 The fluid pressure in the hydraulic system in MPa 11.1.2 The diameter in millimetres of piston B 11.1.3 State TWO advantages of a chain drive when compared to a belt drive - NSC Mechanical Technology Fitting and Machining - Question 11 - 2021 - Paper 1

For piston B, we need to find its diameter using the pressure equalization condition:

Using the formula for pressure and area: $P_A = P_B \Rightarrow \frac{F_A}{A_A} = \frac{F_B}{A_B}$

Rearranging: $A_B = \frac{F_B \cdot A_A}{F_A}$

Substituting values:

• $F_B = 6.45\ kN = 6450\ N$
• $A_A = 4.91 \times 10^{-4}\ m^2$
• $F_A = 1320\ N$

Plugging in: $A_B = \frac{6450\ N \cdot 4.91 \times 10^{-4}\ m^2}{1320\ N} = 2.40 \times 10^{-3}\ m^2$

Now, calculate diameter: $D_B = \sqrt{4A_B/\pi} = \sqrt{4 \cdot 2.40 \times 10^{-3}/\pi} = 0.05528\ m = 55.28\ mm$

• Higher efficiency and less energy loss due to slippage.
• Greater durability and longer operational life under load.

Hydraulic systems are commonly used in construction machinery, such as excavators and cranes, to provide powerful lifting and moving capabilities.