b) A thin layer of water flows down along the surface of a hill. The water is exposed to theatmosphere. Which of the following head may increase as the water flows down?Pressure headElevation headc) As a diver submerges deeper into the ocean, the buoyancy he feels should...Remain the sameTotal head (m)140120d) Mark the best efficiency point of the following pump when the impeller size of 10 inches.10080604020NPSH, (m)ONATotal head (n)450NPSH, (n)400350€30025020010020IncreaseImpeller diameter10 in 31-36-4146 15110150 6 in.8 in9 in007 in y315 HP500 25 50 75 100 12536 41 1463 HP46200Decrease40054 56 57 586 in58.715 HP:6007 in5846800Capacity (L/min)20 HPKinetic head25 HP5157100030 HP7.5 HP 10 HP150 175 200 225 250 275 300 325 350 3758 in 9 in10 in25 50 75 100 125 150 175 200 225 250 275 300 325 350 375Capacity (gal/min)2X3-103500 RPM40 HP50 HP12001400NoneFIGURE 13.28 Complete pump performance chart for a 2 X 3 10 centrifugal pumpat 3500 rpm.

b) A thin layer of water flows down along the surface of a hill. The water is exposed to the atmosphere. Which of the following head may increase as the water flows down? Pressure head Elevation head Kinetic head c) As a diver submerges deeper into the ocean, the buoyancy he feels should... Remain the same Increase Decrease None d) Mark the best efficiency point of the following pump when the impeller size of 10 inches.

b) A thin layer of water flows down along the surface of a hill. The water is exposed to the atmosphere. Which of the following head may increase as the water flows down? Pressure head Elevation head Kinetic head c) As a diver submerges deeper into the ocean, the buoyancy he feels should... Remain the same Increase Decrease None d) Mark the best efficiency point of the following pump when the impeller size of 10 inches.

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Question 1 (Pumps, pumping and water clarification) 1.1 List five different ways in which the pumping of fluids can be accomplished. 1.2 In a winze inclined at 30° to the horizontal, 36 kilolitres per hour must be pumped through a column of 300 m from the bottom to the top of the winze by means of a centrifugal pump. Assume the following: • Velocity is not to exceed 1,5 m/s • Coefficient of pipe friction = 0,01 • Pump and drive efficiency = 78% • Motor efficiency = 90% Determine: a) the size of column required b) the power of the electric motor to drive the pump
oblems: 1. A horizontal pipe, 1 ft. in diameter, tapers gradually to 8 in. in diameter. If the flow is 500 cu ft. of water per minute, what is the difference between the pressures at the two sections? Ans. PA - PB = 443.63lb per sq ft 2. Water flows through a horizontal pipe at a velocity of 50 ft. per sec. Owing to the pipe gradually expanding to a larger size, the velocity decreases to 35 ft. per sec. What is the difference between the pressures at two points, one in each size of pipe? Ans. Pg - PA = 1,236. 75 lb per sq ft
If the net positive suction head (NPSH) requirement for the pump is not satisfied, then Select one: O a. No flow will take place Ob. Efficiency will be low O C. Excessive power will be consumed O d. Cavitation will be formed
- The pump is pumping 28.31 lps of water. What is the input power (kilowatt) to the pump if the efficiency of the pump is 80%. (1 ft= 0.304 m), (1 in = 25 mm) (r.d. of Hg = 13.56) Jin. Jin. 6in. Mcreury -
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] How much hydraulic power would a pump produce when operating at 125 bars anddelivering 1.25 LPS of oil. What power rated electric motor would be selected to drive thispump if its overall efficiency is 88%.
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estimate the volume flow rate of water through the siphon
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Diffrentiate between pumps and turbines