Hardy Cross method is an iterative method for determining the flow in pipe network systems where i. Inputs are known ii. Inputs are unknown iii. Outputs are known iv. Outputs are unknown
- AOnly (i) and (iii)Correct
- BOnly (ii) and (iv)
- COnly (i) and (iv)
- DOnly (ii) and (iii)
Solution
Concept
Hardy Cross method for pipe networks
Formula
NONE
Step-by-step solution
1. The Hardy Cross method is an iterative technique used to analyze flow in pipe network systems. 2. It solves for unknown flow rates and head losses through successive balancing steps. Answer: A
Explanation
The Hardy Cross method is an iterative procedure used to analyze flow distribution within closed pipe network systems. The method requires that all external inflows and outflows at the network nodes are known in order to calculate internal pipe discharges. Therefore, statements i and iii are accurate, making option A correct.
Why the other options are wrong
C) Inputs are unknown rather than known. D) Outputs are unknown rather than known.
Shortcut
Hardy Cross method requires known system inputs (inflows) and outputs (outflows) to balance pipe network flows.
Common mistake
Assuming Hardy Cross method solves for unknown inputs and outputs rather than assuming known junction inputs/outputs and finding internal pipe flows.
Correct answer: A) Only (i) and (iii)