Applied Fluid Mechanics (7th Edition)
Applied Fluid Mechanics (7th Edition)
7th Edition
ISBN: 9780132558921
Author: Robert L. Mott, Joseph A. Untener
Publisher: PEARSON
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Chapter 7, Problem 7.21PP

The specifications for an automobile fuel pump state that it should pump 1.0 L of gasoline in   40 s with a suction pressure of 150 mm of mercury vacuum and a discharge pressure of 30 kPa. Assuming that the pump efficiency is 60 percent, calculate the power drawn from the engine. See Fig. 7 .25 The suction and discharge lines are the same size. Elevation changes can be neglected.

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1. A centrifugal pump delivers 300,000 liters per hour of water to a pressurized tank whose pressure is 280 kPa. The source of water is 5 meter below the pump. The diameter of the suction pipe is 300 mm and the discharge pipe is 250 mm. Calculate the kW rating of the driving motor assuming the pump efficiency to be 72%.
Seven hundred gpm of water are being discharged by a centrifugal pump 5 ft. above the pump inlet. The inlet pressure is 4-in Hg above atmospheric and the discharge pressure is 29 psia. Assume the pump input is 8 hp, if the pump has an 8-inch diameter inlet and a 4-inch diameter discharge: 1.How much pressure loss in the pump? a. 28.4 ft-lbf/lb b. 5 ft-lbf/lb c. 4.7 ft-lbf/lb d. 38.1 ft-lbf/lb 2. How much is the velocity loss in the pump? a. 28.4 ft-lbf/lb b. 45.3 ft-lbf/lb c. 4.7 ft-lbf/lb d. 38.1 ft-lbf/lb 3. If the pump speed is increased from 1600 to 2400 rpm, what will be the new net flow rate in the pump? a. 800 gpm b. 1050 gpm c. 1400 gpm d. 1965 gpm 4. Find the new brake horse power if the pump speed in increased from 1600 to 2400 rpm. a. 64 hp b. 20.25 hp c. 8 hp d. 30.375 hp
A system requires a pump to deliver 30 gal/min at 1500 lbf/in2 at an engine speed of 2000 rpm. calculate theoretical pump displacement, engine torque to drive the unit, and horsepower.

Chapter 7 Solutions

Applied Fluid Mechanics (7th Edition)

Ch. 7 - A submersible deep-well pump delivers 745 gal/h of...Ch. 7 - In a pump test the suction pressure at the pump...Ch. 7 - The pump shown in Fig. 7.19 is delivering...Ch. 7 - The pump in Fig. 7.20 delivers water from the...Ch. 7 - Repeat Problem 7.14, but assume that the level of...Ch. 7 - Figure 7.21 shows a pump delivering 840L/min of...Ch. 7 - Figure 7.22 shows a submersible pump being used to...Ch. 7 - Figure 7.23 shows a small pump in an automatic...Ch. 7 - The water being pumped in the system shown in Fig....Ch. 7 - A manufacturer's rating for a gear pump states...Ch. 7 - The specifications for an automobile fuel pump...Ch. 7 - Figure 7.26 shows the arrangement of a circuit for...Ch. 7 - Calculate the power delivered to the hydraulic...Ch. 7 - Water flows through the turbine shown in Fig....Ch. 7 - Calculate the power delivered by the oil to the...Ch. 7 - What hp must the pump shown in Fig. 7.30 deliver...Ch. 7 - If the pump in Problem 7.26 operates with an...Ch. 7 - The system shown in Fig. 7.31 delivers 600 L/min...Ch. 7 - Kerosene (sg = 0.823 ) flows at 0.060m3/s in the...Ch. 7 - Water at 60 F flows from a large reservoir through...Ch. 7 - Figure 7.34 shows a portion of a fire protection...Ch. 7 - For the conditions of Problem 7.31 and if we...Ch. 7 - In Fig. 7.35 kerosene at 25 F is flowing at 500...Ch. 7 - For the system shown in Fig. 7.35 and analyzed in...Ch. 7 - Compute the power removed from the fluid by the...Ch. 7 - Compute the pressure at point 2 at the pump inlet.Ch. 7 - Compute the pressure at point 3 at the pump...Ch. 7 - Compute the pressure at point 4 at the press...Ch. 7 - Compute the pressure at point 5 at the press...Ch. 7 - Evaluate the suitability of the sizes for the...Ch. 7 - The portable, pressurized fuel can shown in Fig....Ch. 7 - Professor Crocker is building a cabin on a...Ch. 7 - If Professor Crocker's pump, described in Problem...Ch. 7 - The test setup in Fig. 7.39 measures the pressure...Ch. 7 - If the fluid motor in Problem 7.44 has an...Ch. 7 - A village with a need for a simple irrigation...Ch. 7 - As a member of a development team for a new jet...Ch. 7 - A fire truck utilizes its engine to drive a pump...Ch. 7 - A home has a sump pump to handle ground water from...Ch. 7 - In Problem 6.107 an initial calculation was made...Ch. 7 - A creek runs through a certain part of a campus...Ch. 7 - A hot tub is to have 40 outlets that are each 8 mm...Ch. 7 - A large chipper/shredder is to be designed for use...
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