Exmp3-Two centrifugal pumps have the head and discharge characteristics as follows: Discharge Q litres/second 8 12 16 20 24 PUMP 1 Head Hm, (metres) 50.0 51.8 50.8 48.0 42.5 32.5 18.3 PUMP2 46.7 45.9 44.2 40.3 34.3 26.0 17.0 Head Hm, (metres) m2 Both pumps are installed together and are required to pump water through a pipe 150 mm diameter having f = 0.02. Calculate the heads %3D under which pumps are working and discharge in liters per second pumped by them if:

Exmp3-Two centrifugal pumps have the head and discharge characteristics as follows: Discharge Q litres/second 8 12 16 20 24 PUMP 1 Head Hm, (metres) 50.0 51.8 50.8 48.0 42.5 32.5 18.3 PUMP2 46.7 45.9 44.2 40.3 34.3 26.0 17.0 Head Hm, (metres) m2 Both pumps are installed together and are required to pump water through a pipe 150 mm diameter having f = 0.02. Calculate the heads %3D under which pumps are working and discharge in liters per second pumped by them if:

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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Q4) A) A radial, multistage, four impellers, keyed to the same shaft, centrifugal pump is manufactured for the following data:- • Discharge 45000 L/sec of water. • Head of mamometric is 60 m. • N=350 rpm. B2 =60° vt = 0.27 vị The losses in the centrifugal pump are 1/3 of the velocity head at outlet of the impeller. Determine:- • The absolute velocity of the water leaving impeller • The manometric efficiency • Diameter of the impeller. B) Draw typical velocity triangles at inlet and at outlet for low, medium and high specific speed Francis turbines as well as Kaplan turbines.
B-A pump has the following parameters N=2133.5 RPM, Ns = 40 RPM, D= 37.1 cm and is used to pump water up to 90 m(H) at maximum efficiency operation: write the answer only (a) At what speed should the pump be operated to pump water up to (76 m)? (b) What is the discharge in each case? (c) What is pumping power needed in each case? (d) What is consumed electrical power in each case if max = 90%? e- A pump discharges liquid at the rate of Q against a head of H. If specific weight of the liquid is w, find the expression for the pumping power.
A two-lobe rotary positive-displacement pump, similar to that of Fig., moves 0.45 cm3 of SAE 30 motor oil in each lobe volume Vlobe, as sketched. Calculate the volume flow rate of oil for the case where n. = 900 rpm.
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Q.5 A pump circulates water through a closed pipe network connecting a water heater and a heating coil (heat exchanger) in a room. The total length of the pipe is 28 m and the diameter is 32 mm. There are six 90°-elbows and a globe valve in the network. The head loss through the water heater and the heating coil are 1.6 m and 1.2 m respectively. The water flow rate is 0.88 Ls!. The system uses schedule-40 steel pipes with threaded fittings. Calculate the (i) flow velocity and the unit pressure loss in the pipe. (ii) increase in head across the pump. (iii) power input to the pump if the efficiency of the pump is 70%.
! Required Information NOTE: This is a multi-part question. Once an answer is submitted, you will be unable to return to this part. Several forces are acting on a bolt as shown in the diagram below. It is desired to determine the resultant of all of the forces acting on the bolt. The axis of the bolt is at a 45° angle with respect to the x-axis. The line of action of force Pis parallel to the x-axis. The magnitudes of the forces and the angles labeled are as follows: P=38 N S= 64 N T=31 N a=15° B= 65° Q=52 N 8= 25° T S After performing a visual examination of the problem, what assumptions can be made regarding the four given forces? Check all that apply.
1. Ifa pump discharges 70 GPM of water whose specific weight is 61.5 lb/ff° at local g= 31.9 t/s, find a. Mass flow rate Ib/min b. Time to fill a drum 100 in. diameter and 12 ft high, min.
3) Given: Q = 14 lit/sec; For the suction pipe: %3D diam. = 180mm with head loss = three times its %3D %3D velocity head; For the discharge pie: diam. = 142mm with head loss of twenty times its velocity head; pump elev. = 55m. Req'd: a) horsepower input of the pump if Efficiency = 88% %3D b) pressure at the discharge side of the pump. EL 109 m EL. 55 m EL 54 m RIVER
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A centrifugal pump is to discharge water against a net head of 15 m at a speed of 1000 r.p.m. The vanes are curved backward at 30 with the periphery. Obtain discharge for an impeller diameter of 300 mm, its width at outlet is 50 mm and manometric efficiency is 90%.
PROBLEM 5 An axial flow pump is required to deliver 1m3/s at 7m head while running at 960 rpm. Its outer diameter is 50 and hub diameter is 25 cm. Find the following: (1) flow velocity, which is assumed to be constant from hub to tip, and A. 4.59 m/s B. 6.791 m/s C. 60.7 m/s D. 39.3 m/s (2) power required to drive the pump if overall efficiency is 84%. A. 81.75 kW B. 12.03 kW C. 40.7 kW D. 60.9 kW
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