A centrifugal pump with a 30 cm diameter impeller requires a power input of 45 kW when the flow rate is 12 kL/min against an 18 m head. The impeller is changed to one with a 25 cm diameter. Determine The expected flow rate. Actual head. Input power if the pump speed remains the same. (i) (ii) (iii)

A centrifugal pump with a 30 cm diameter impeller requires a power input of 45 kW when the flow rate is 12 kL/min against an 18 m head. The impeller is changed to one with a 25 cm diameter. Determine The expected flow rate. Actual head. Input power if the pump speed remains the same. (i) (ii) (iii)

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

See similar textbooks

Similar questions

A centrifugal pump delivers 227 m³/hr of water from a source 4 meters below the pump centre line to a pressure tank whose pressure is 2.8 kg/cm² . Friction loss estimates are 2 meters in the suction line and 1 metre in the discharge line. The diameter of the suction pipe is 250 mm and the discharge pipe is 200 mm. Find: a. The water horsepower b. The kW rating of the driving motor if the pump efficiency is 70%
A 3.5-hp pump delivers 1140 Ibf of ethylene glycol at 20°C in 12 seconds, against a head of 17 ft. Calculate the efficiency of the pump in %.
A turbine is discl ging 10 m3/s under a head of 22 m at 200 rpm. The efficiency is 90%. Determine the performance of turbine under a head of 44 m.
A Pelton wheel develops 1800 kW under a head of 120 m while running at 210 rpm and discharging of 2.5m ^ 3/s of water. If the head is reduced to 80 m, find the new discharge, power and speed of turbine A.
Two identical centrifugal pumps connected in series are used to pump water between two storage tanks that are open to the atmosphere, through a cylindrical pipe with ID of 0.1 m on both the discharge and suction side. The total equivalent length on the suction and discharge sides are 20m and 40m respectively. The change in static head is 7m. Pump Data: Q( m3/s) 0 0.01 0.02 0.03 0.04 Δh (m) 23 21.5 18.5 11 3 Assume the friction factor f to be 0.02 and is constant throughout the range of flowrates. a) Determine the operating point of the system. b) Determine the power requirement for the pumping system if the pump efficiency is 75%.
PAY ATTENTION TO THE QUESTION : What is the resulting flow rate in the system if three pumps are used in parallel? (a) 0.483 m^3/s (b) 0.364 m^3/s (c) 0.333 m^3/s (d) 0.563 m^3/s 1. The Head -flowrate curve for a centrifugal pump is given by: HP = 28 -30Q2 Where, HP is in meter and Q is in m3/s . This pump is used to pump water for a system with the following (H-Q) curve: HS = 8 + 150Q2 Where, HS is in meter and Q is in m3/s . IT SAYS : if theee pumps are used in parallel PAY ATTENTION Multiple choice choose correct answer
A pelton wheel is supplied with water under a head of 100 m at the rate 1000 litres/s. The bucket deflects the jet through an angle of 160°. The mean speed of bucket is 20 m/s. Find : Mass flow rate of water (i) (ii) Velocity of jet (iii) Power output H. V2 V2 160° C $ = 20° A V1 =Vw1
Q3.A Francis turbine has the dimensions of r=1.42 m, r,=2.00 m br=2.20 m and by=0.731m. Rotation speed of the turbine is 180 rpm. Three angles of velocities at the inlet and outled of the blade are defined as oaz= 35° and al=25° The flow rate of turbine is 340 m/s and the total head of the turbine is 80 m. Neglecting losses, www a) Draw the velocity three anges at inlet and outlet of the blade. b) Calculate blade angles at inlet and outlet of the blade, Power. Net head of turbine. c) Losses in water channel (Penstock). Note: Point (2) presents inlet and while point (1) presents outlet section of blade. Adjustable guide vane Blade n
I need the answer quickly
A centrifugal fan rotates at a speed of 1460r/min and must deliver 1, 3m^3/s of air of density 1,22kg/m^3 at a total pressure of 370pa. Assume the manometric efficiency of the fan is 55% and that the whirl velocity at the exit of the impeller is double that of the peripheral velocity. Ignore mechanical losses and calculate a) the peripheral velocity of the impeller. b) the diameter of the impeller c) the power required to drive the fan
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
A centrifugal pump pumps water at a flow rate of 7 m³/s to a height of 10 m. If the pump works at the best efficiency point, find the pump impeller diameter, pump speed, the best efficiency value of the pump, the head at the best efficiency value, and the specific speed of the pump, given that CQ=0.15 CH=6 CP=0.75.