Thiago Thomas water engineer

Thiago Thomas – Water Engineer

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Instructions: Answer all questions to the best of your ability. Your responses will be reviewed and scored.

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Question 1

How do you handle inflow and infiltration in sewer systems?

Question 2

How would you calibrate hydraulic model against field data?

Question 3

Explain wastewater peak flow calculation for municipal system.

Question 4

What steps would you take when supervising wastewater pipeline construction?

Question 5

Describe typical wastewater treatment plant flow diagram.

Question 6
MC Timer: 30s

What does hydraulic grade line (HGL) represent in a water distribution system?

A. Pipe material strength B. Energy head available at any point C. Water velocity profile D. Pump efficiency curve

Question 7
MC Timer: 30s

EPANET uses which default headloss formula for water pipes?

A. Darcy-Weisbach B. Hazen-Williams C. Manning\\\'s equation D. Colebrook-White

Question 8
MC Timer: 30s

What is the typical detention time for a wastewater treatment primary clarifier?

A. 30 minutes B. 2-3 hours C. 8-12 hours D. 24 hours

Question 9
MC Timer: 30s

What causes water hammer in pipelines?

A. Slow valve closure B. Sudden pressure changes from rapid valve operation C. Pipe corrosion D. High water temperature

Question 10

How would you adapt Brazilian wastewater experience to new country standards?

Question 11

What causes low pressure zones in water distribution networks?

Question 12

What are key considerations for pump station design?

Question 13

Explain difference between steady state and extended period simulation.

Question 14
MC Timer: 30s

What is critical slope in open channel flow?

A. Steepest stable slope B. Slope where normal depth equals critical depth C. Minimum slope for flow D. Horizontal slope

Question 15
MC Timer: 30s

Peak factor for domestic wastewater design is typically?

A. 1.0-1.2 B. 2.0-3.0 C. 4.0-5.0 D. 6.0+

Question 16
MC Timer: 30s

What is the purpose of an air valve in water pipelines?

A. Pressure regulation B. Remove trapped air and allow air entry during draining C. Flow measurement D. Chemical injection

Question 17
MC Timer: 30s

In wastewater networks, what is the minimum self-cleansing velocity for sewers?

A. 0.3 m/s B. 0.6 m/s C. 0.9 m/s D. 1.2 m/s

Question 18
MC Timer: 30s

In sewer design, what does the term \\\"peak wet weather flow\\\" refer to?

A. Average daily flow B. Maximum flow during heavy rainfall C. Dry weather maximum D. Minimum night flow

Question 19

Explain difference between water hammer and surge in pipelines.

Question 20

Describe how to set up EPANET model for water distribution network.

Question 21
MC Timer: 30s

In gravity sewer design, minimum slope ensures?

A. Maximum velocity B. Self-cleansing velocity C. Pipe durability D. Cost reduction

Question 22
MC Timer: 30s

What does BOD measure in wastewater?

A. Suspended solids B. Oxygen required to biologically degrade organic matter C. Chemical oxygen demand D. pH level

Question 23
MC Timer: 30s

In hydraulic modeling, what does NR represent?

A. Network reliability B. Number of iterations for convergence C. Node reference D. Normal range

Question 24

Describe AutoCAD workflow for water pipeline design drawings.

Question 25
MC Timer: 30s

WaterGEMS connects with which software for GIS data?

A. Excel only B. ArcGIS or QGIS C. AutoCAD only D. Word

Question 26

Describe pressure management strategies in water distribution.

Question 27

Explain use of hydraulic grade line (HGL) in pipe network analysis.

Question 28

What factors determine sewer pipe minimum gradient?

Question 29
MC Timer: 30s

Surge protection in water systems commonly uses?

A. Larger pipe diameters B. Surge tanks or air chambers C. More pumps D. Thicker pipe walls

Question 30
MC Timer: 30s

Which pipe material is most corrosion resistant for wastewater?

A. Mild steel B. PVC or HDPE C. Asbestos cement D. Galvanized iron