Principles of Technology

Fluid Resistance (4:2)

Review Worksheet

If you understand and can do these problems you should do well on the quiz.

1. List the appropriate formulas and units in the boxes below.

Fluid Resistance


Units (SI / English)



2. Water flows through a 10 foot pipe at a flow rate of 0.75 m3/sec. It undergoes a pressure drop of 150 N/m2. Find the resistance of the pipe.


3. The resistance in a fuel-transfer pipeline is 3 (lb/in2) / (gal/min). The line is 6.75 inches in diameter. Fuel moves through the line at a volume flow rate of 650 gal/min. Find the pressure difference along the length of the pipeline.


4. A fluid flows through a certain length of pipe at 0.075 m3/sec and undergoes a pressure drop of 2000 N/m2. Calculate the fluid resistance of the pipe.


5. In order to run water to all the trees in an orchard, would it be better to run just one pipe with a sprinkler at each tree, or hook the rows all up in a parallel system? WHY?


6. A hose has a resistance Rf equal to 0.5 (lb/in2) / (gal/min). What pressure drop across the hose is needed to produce a flow rate of 20 gal/min?


7. An air hose is 30 feet long, and has a flow rate of 5 gal/min. There's a pressure drop of 12 lb/in2.

7a. What is the flow rate of this hose?


7b. What will be the flow rate if an identical hose is connected, in series, to the first?


8. Water flowing through a pipe at 18 ft3/min has a pressure difference of 200 lb/in2 over a distance of 2.2 miles. Find the resistance (Rf) that causes the pressure difference.


9. An air compressor delivers air to a receiver tank at 135 lbs/in2. A 120 foot air hose with a pressure drop of 2.3 lbs/in2 for each 15 foot of length is connected to the tank. The hose operates an air tool.

9a. Find the pressure at the air tool in lbs/in2 and lbs/ft2.


9b. Find the resistance in the air hose if the tool requires 20 ft3/min of air to operate.



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