FLUID MECHANICS FUND. (LL)-W/ACCESS
4th Edition
ISBN: 9781266016042
Author: CENGEL
Publisher: MCG CUSTOM
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Textbook Question
Chapter 5, Problem 137P
Seawater is to be pumped into a large tank at a rate of 165 kg/mm. The tank is open to the atmosphere and the water enters the tank from a 80-rn-height. The overall efficiency of the motor-pump unit is 75 percent and the motor COHSUCS electricity at a rate of 3.2 kW. Take the correction factor to be I. If tile irreversible head loss in the piping is 7 m. the velocity of the water at the tank inlet is
(a) 2.34 m/s
(b) 4.05 m/s
(c)6.21 m/s
(d) 8.33 m/s
(e) 10.7 m/s
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ASAP
A centrifugal pump that is used in pumping water to a tank operates at a rate of 1 gpm. The pump is driven directly by an electric motor with an input power of 1.5 hp running at a speed of 1700 rpm. The total head loss of the system is 10 m. If the motor drives the pump at 2200 rpm, what is the rate of flow of the pump?
The pump is used to increase the pressure of water from 100 kPa to 900 kPa at arate of 160 L/min. If the shaft power input is 3 Kw, the efficiencyncy of the pump is
CHOICES:
a.0.660
b.0.711
c.0.532
d.0.747
The power developed by the pump is 30kw. What is the percent decrease in power if speed will decrease by 40%. ANSWER: 78.4%
Chapter 5 Solutions
FLUID MECHANICS FUND. (LL)-W/ACCESS
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Determine the flow rate of...Ch. 5 - The velocity profile for turbulent flow in a...Ch. 5 - The demand for electric power is usually much...Ch. 5 - Prob. 92PCh. 5 - Consider a fully filled hemisphere shaped tank...Ch. 5 - The velocity of a liquid flowing in a circular...Ch. 5 - Air at 250 kgrn3 enters a nozzle that has an...Ch. 5 - The air in a 5m5-m3-m hospital room is to be...Ch. 5 - The water level in a tank is 70 ft above the...Ch. 5 - A pressurized 2-rn-diameter tank of water has a...Ch. 5 - Underground water is being pumped into a pool...Ch. 5 - Prob. 100PCh. 5 - A very large tank contains air at 102 kPa at a...Ch. 5 - Water is flowing through a Venturi meter whose...Ch. 5 - Water flows at a rate of 0.011 m3/s in a...Ch. 5 - Air flows through a pipe at a rate of 120 L/s. The...Ch. 5 - A 3-rn-high large tank is initially filled with...Ch. 5 - Reconsider Prob. 5-105. 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