Q1. What does pipe sizing primarily determine?
A. Pipe color
B. Fluid velocity and pressure drop ✓ CORRECT
C. Pipe material
D. Pipe thread type
Q2. Which formula is commonly used to calculate pipe flow velocity?
A. V = Q / A ✓ CORRECT
B. V = P × D
C. V = F / T
D. V = Q × D
Q3. In pipe sizing, 'Q' typically represents:
A. Pressure
B. Diameter
C. Flow rate ✓ CORRECT
D. Velocity
Q4. The Darcy-Weisbach equation is used to calculate:
A. Pipe material strength
B. Pressure drop due to friction ✓ CORRECT
C. Pipe wall thickness
D. Flow temperature
Q5. What is the standard unit for volumetric flow rate in the imperial
system?
A. m³/s
B. GPM (gallons per minute) ✓ CORRECT
C. LPM
D. CFH
Q6. Nominal pipe size (NPS) refers to:
, A. The exact outer diameter
B. A standardized designation that approximates pipe size ✓ CORRECT
C. The wall thickness
D. The pipe length
Q7. Which of the following increases pressure drop in a pipe?
A. Larger diameter
B. Shorter length
C. Higher flow velocity ✓ CORRECT
D. Lower fluid viscosity
Q8. Reynolds number is used to determine:
A. Pipe material
B. Whether flow is laminar or turbulent ✓ CORRECT
C. Pipe schedule
D. Valve type
Q9. Laminar flow occurs when Reynolds number is:
A. Greater than 4000
B. Between 2300 and 4000
C. Less than 2300 ✓ CORRECT
D. Greater than 10000
Q10. Turbulent flow typically occurs at Reynolds numbers above:
A. 1000
B. 2300
C. 4000 ✓ CORRECT
D. 10000
Q11. Which pipe schedule has thicker walls: Schedule 40 or Schedule 80?
A. Schedule 40
B. Schedule 80 ✓ CORRECT
C. Both are the same
D. Depends on material
Q12. The Hazen-Williams formula is most commonly used for:
A. Gas flow
B. Water flow in plumbing systems ✓ CORRECT
C. Steam flow
D. Oil flow
,Q13. Equivalent length method converts:
A. Pressure to flow
B. Fittings into equivalent lengths of straight pipe ✓ CORRECT
C. Diameter to flow rate
D. Velocity to pressure
Q14. Which fitting has the highest resistance (highest equivalent length)?
A. 90° long-radius elbow
B. Tee (flow-through)
C. Tee (branch flow) ✓ CORRECT
D. Gate valve (fully open)
Q15. Pipe schedule number indicates:
A. Pipe length
B. Wall thickness relative to diameter ✓ CORRECT
C. Pipe material grade
D. Flow capacity
Q16. What does 'DN' stand for in metric pipe sizing?
A. Design Number
B. Diameter Nominal ✓ CORRECT
C. Dynamic Number
D. Duct Nominal
Q17. The Manning equation is primarily used for:
A. Pressure pipes
B. Open channel and gravity flow ✓ CORRECT
C. High-pressure steam
D. Compressed air
Q18. Hydraulic radius is defined as:
A. Pipe radius divided by 2
B. Cross-sectional area divided by wetted perimeter ✓ CORRECT
C. Pipe diameter
D. Half the pipe circumference
Q19. Which fluid property most affects pipe sizing for viscous fluids?
A. Color
B. Density
C. Dynamic viscosity ✓ CORRECT
, D. Temperature alone
Q20. Kinematic viscosity is:
A. Dynamic viscosity × density
B. Dynamic viscosity / density ✓ CORRECT
C. Density / pressure
D. Pressure / velocity
Q21. Water hammer is caused by:
A. Slow valve opening
B. Sudden change in flow velocity ✓ CORRECT
C. High pipe temperature
D. Low pressure
Q22. Which material is most resistant to corrosion for chemical service?
A. Carbon steel
B. Cast iron
C. CPVC or lined pipe ✓ CORRECT
D. Galvanized steel
Q23. Cavitation in pumps and pipes occurs when:
A. Pressure exceeds maximum
B. Local pressure drops below vapor pressure ✓ CORRECT
C. Flow is too slow
D. Temperature is too high
Q24. What does 'head loss' refer to in pipe sizing?
A. Loss of pipe material
B. Energy loss per unit weight of fluid ✓ CORRECT
C. Pressure increase
D. Pipe length reduction
Q25. Minor losses in a piping system are caused by:
A. Pipe friction
B. Fittings, valves, and bends ✓ CORRECT
C. Fluid viscosity
D. Pipe material
Q26. The continuity equation states that in a pipe, as diameter decreases:
A. Velocity decreases
A. Pipe color
B. Fluid velocity and pressure drop ✓ CORRECT
C. Pipe material
D. Pipe thread type
Q2. Which formula is commonly used to calculate pipe flow velocity?
A. V = Q / A ✓ CORRECT
B. V = P × D
C. V = F / T
D. V = Q × D
Q3. In pipe sizing, 'Q' typically represents:
A. Pressure
B. Diameter
C. Flow rate ✓ CORRECT
D. Velocity
Q4. The Darcy-Weisbach equation is used to calculate:
A. Pipe material strength
B. Pressure drop due to friction ✓ CORRECT
C. Pipe wall thickness
D. Flow temperature
Q5. What is the standard unit for volumetric flow rate in the imperial
system?
A. m³/s
B. GPM (gallons per minute) ✓ CORRECT
C. LPM
D. CFH
Q6. Nominal pipe size (NPS) refers to:
, A. The exact outer diameter
B. A standardized designation that approximates pipe size ✓ CORRECT
C. The wall thickness
D. The pipe length
Q7. Which of the following increases pressure drop in a pipe?
A. Larger diameter
B. Shorter length
C. Higher flow velocity ✓ CORRECT
D. Lower fluid viscosity
Q8. Reynolds number is used to determine:
A. Pipe material
B. Whether flow is laminar or turbulent ✓ CORRECT
C. Pipe schedule
D. Valve type
Q9. Laminar flow occurs when Reynolds number is:
A. Greater than 4000
B. Between 2300 and 4000
C. Less than 2300 ✓ CORRECT
D. Greater than 10000
Q10. Turbulent flow typically occurs at Reynolds numbers above:
A. 1000
B. 2300
C. 4000 ✓ CORRECT
D. 10000
Q11. Which pipe schedule has thicker walls: Schedule 40 or Schedule 80?
A. Schedule 40
B. Schedule 80 ✓ CORRECT
C. Both are the same
D. Depends on material
Q12. The Hazen-Williams formula is most commonly used for:
A. Gas flow
B. Water flow in plumbing systems ✓ CORRECT
C. Steam flow
D. Oil flow
,Q13. Equivalent length method converts:
A. Pressure to flow
B. Fittings into equivalent lengths of straight pipe ✓ CORRECT
C. Diameter to flow rate
D. Velocity to pressure
Q14. Which fitting has the highest resistance (highest equivalent length)?
A. 90° long-radius elbow
B. Tee (flow-through)
C. Tee (branch flow) ✓ CORRECT
D. Gate valve (fully open)
Q15. Pipe schedule number indicates:
A. Pipe length
B. Wall thickness relative to diameter ✓ CORRECT
C. Pipe material grade
D. Flow capacity
Q16. What does 'DN' stand for in metric pipe sizing?
A. Design Number
B. Diameter Nominal ✓ CORRECT
C. Dynamic Number
D. Duct Nominal
Q17. The Manning equation is primarily used for:
A. Pressure pipes
B. Open channel and gravity flow ✓ CORRECT
C. High-pressure steam
D. Compressed air
Q18. Hydraulic radius is defined as:
A. Pipe radius divided by 2
B. Cross-sectional area divided by wetted perimeter ✓ CORRECT
C. Pipe diameter
D. Half the pipe circumference
Q19. Which fluid property most affects pipe sizing for viscous fluids?
A. Color
B. Density
C. Dynamic viscosity ✓ CORRECT
, D. Temperature alone
Q20. Kinematic viscosity is:
A. Dynamic viscosity × density
B. Dynamic viscosity / density ✓ CORRECT
C. Density / pressure
D. Pressure / velocity
Q21. Water hammer is caused by:
A. Slow valve opening
B. Sudden change in flow velocity ✓ CORRECT
C. High pipe temperature
D. Low pressure
Q22. Which material is most resistant to corrosion for chemical service?
A. Carbon steel
B. Cast iron
C. CPVC or lined pipe ✓ CORRECT
D. Galvanized steel
Q23. Cavitation in pumps and pipes occurs when:
A. Pressure exceeds maximum
B. Local pressure drops below vapor pressure ✓ CORRECT
C. Flow is too slow
D. Temperature is too high
Q24. What does 'head loss' refer to in pipe sizing?
A. Loss of pipe material
B. Energy loss per unit weight of fluid ✓ CORRECT
C. Pressure increase
D. Pipe length reduction
Q25. Minor losses in a piping system are caused by:
A. Pipe friction
B. Fittings, valves, and bends ✓ CORRECT
C. Fluid viscosity
D. Pipe material
Q26. The continuity equation states that in a pipe, as diameter decreases:
A. Velocity decreases
