Mid-term
Assessment
Student Number
Q1 (/30) Q2 (/11) Q3 (/19) Total (/60) Percentage
Faculty of Engineering and the Built Environment
QUALIFICATION (S) Advanced Diploma in Mechanical CODE (S) ADMCHE/ADMCRE
Engineering
SUBJECT (S) Fluid Mechanics CODE (S) FLM471S/FLM470S
NO OF PAGES (including DATE 27 Mar 2025 TIME
cover page)
9 17:30
PRINTING INSTRUCTIONS Print single-sided DURATION 2 hours
COLOUR (Y/N) TOTAL
N MARKS
60 marks = 100%
EXAMINER NAME H Fawkes
INTERNAL MODERATOR M Petersen
ANNEXURES
Table A11 – Properties of the atmosphere at high altitudes (Cengel); Table A3 – Properties of fresh
water (Cengel); Fanning friction factor chart (Massey); Formula sheet.
INSTRUCTIONS
1) Write the answers to the questions in the space provided below each question. In some questions,
“Final answer only” is required. For other questions, you must show your explanation and/or
calculations in the space provided. Rough work can be done in the answer book – but it will not be
marked.
2) This test/answer paper and your ‘rough work’ book must be handed in together to receive all
marks. Make sure that your name is on each page of this test/answer paper and on your rough work
book cover.
3) Calculated answers of inexact numbers must be accurate to at least four significant digits.
4) Units of measurement (m, s, l/s, kg, N, kW, …) must be included in your answers unless instructed
otherwise.
5) All calculations and answers must be in blue or black ink.
DO NOT turn the page over before the starting time
, Question 1 [30 marks]
The pipes in the network below all have an internal diameter of 75 mm. They are made from
galvanized steel. Their lengths are in the table below. Some initial assumptions for water flow
rate (in m3/s) are shown on the drawing below.
Pipe Length (m)
AB 40 0.020
BC 15
CA 36 0.030
CD 20
DA 45 B
BE 12 0.010 E
ED 55 0.032
Loop 1
A
C Loop 3
0.035 0.016
Loop 2
0.008
0.009
D
0.015
Q1a Calculate the flow rates in pipes BE and DC. Ensure that you write down the correct sign
(+ or ) for the flow rates that correspond to the pipe labels (BE and DC) provided in this
question. [4]
Final answer only
Q1b Write the flow rates of pipes BE and DC in the boxes provided in the diagram above (no
units required) and show flow directions (add arrowheads to pipes BE and DC). [2]
Q1c Determine the friction factor for the network. No units required. [3]
Q1d Calculate the k values for Loop 1 (pipes AB, BC, CA). No units required. [3]
Final answers only
Assessment
Student Number
Q1 (/30) Q2 (/11) Q3 (/19) Total (/60) Percentage
Faculty of Engineering and the Built Environment
QUALIFICATION (S) Advanced Diploma in Mechanical CODE (S) ADMCHE/ADMCRE
Engineering
SUBJECT (S) Fluid Mechanics CODE (S) FLM471S/FLM470S
NO OF PAGES (including DATE 27 Mar 2025 TIME
cover page)
9 17:30
PRINTING INSTRUCTIONS Print single-sided DURATION 2 hours
COLOUR (Y/N) TOTAL
N MARKS
60 marks = 100%
EXAMINER NAME H Fawkes
INTERNAL MODERATOR M Petersen
ANNEXURES
Table A11 – Properties of the atmosphere at high altitudes (Cengel); Table A3 – Properties of fresh
water (Cengel); Fanning friction factor chart (Massey); Formula sheet.
INSTRUCTIONS
1) Write the answers to the questions in the space provided below each question. In some questions,
“Final answer only” is required. For other questions, you must show your explanation and/or
calculations in the space provided. Rough work can be done in the answer book – but it will not be
marked.
2) This test/answer paper and your ‘rough work’ book must be handed in together to receive all
marks. Make sure that your name is on each page of this test/answer paper and on your rough work
book cover.
3) Calculated answers of inexact numbers must be accurate to at least four significant digits.
4) Units of measurement (m, s, l/s, kg, N, kW, …) must be included in your answers unless instructed
otherwise.
5) All calculations and answers must be in blue or black ink.
DO NOT turn the page over before the starting time
, Question 1 [30 marks]
The pipes in the network below all have an internal diameter of 75 mm. They are made from
galvanized steel. Their lengths are in the table below. Some initial assumptions for water flow
rate (in m3/s) are shown on the drawing below.
Pipe Length (m)
AB 40 0.020
BC 15
CA 36 0.030
CD 20
DA 45 B
BE 12 0.010 E
ED 55 0.032
Loop 1
A
C Loop 3
0.035 0.016
Loop 2
0.008
0.009
D
0.015
Q1a Calculate the flow rates in pipes BE and DC. Ensure that you write down the correct sign
(+ or ) for the flow rates that correspond to the pipe labels (BE and DC) provided in this
question. [4]
Final answer only
Q1b Write the flow rates of pipes BE and DC in the boxes provided in the diagram above (no
units required) and show flow directions (add arrowheads to pipes BE and DC). [2]
Q1c Determine the friction factor for the network. No units required. [3]
Q1d Calculate the k values for Loop 1 (pipes AB, BC, CA). No units required. [3]
Final answers only
