Two electric motors are being considered to drive a centrifugal pump. Each motor is capable of delivering 90 horsepower (output) to the pumping operation. It is expected that the motors will be in use 2,000 hours per year and the MARR = 5% per year. (1 hp = 0.746 kW) a. If electricity costs $X per kilowatt-hour, calculate the annual cost of electrical power for each motor b. What cost of electricity ($/kWh) makes the two pumps breakeven (i.e. have the same equivalent annual cost)? Assume repeatability and MVs = $0. c. Choose the graph to illustrate your answer to Part (b). d. Which motor should be selected? Click the icon to view the datatable for the additional information about two alternatives. Click the icon to view the interest and annuity table for discrete compounding when the MARR is 5% per year. a. The annual cost of electrical power for Motor A is $( XX). (Round to two decimal places.)

Two electric motors are being considered to drive a centrifugal pump. Each motor is capable of delivering 90 horsepower (output) to the pumping operation. It is expected that the motors will be in use 2,000 hours per year and the MARR = 5% per year. (1 hp = 0.746 kW) a. If electricity costs $X per kilowatt-hour, calculate the annual cost of electrical power for each motor b. What cost of electricity ($/kWh) makes the two pumps breakeven (i.e. have the same equivalent annual cost)? Assume repeatability and MVs = $0. c. Choose the graph to illustrate your answer to Part (b). d. Which motor should be selected? Click the icon to view the datatable for the additional information about two alternatives. Click the icon to view the interest and annuity table for discrete compounding when the MARR is 5% per year. a. The annual cost of electrical power for Motor A is $( XX). (Round to two decimal places.)

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

Two electric motors are being considered to drive a centrifugal pump. Each motor is capable of delivering 60 horsepower (output) to the pumping operation. It is expected that the motors will be in use 2,000 hours per year and the MARR = 8% per year. (1 hp = 0.746 kW) a. If electricity costs $X per kilowatt-hour, calculate the annual cost of electrical power for each motor b. What cost of electricity (S/kWh) makes the two pumps breakeven (i.e. have the same equivalent annual cost)? Assume repeatability and MVS = $0. c. Choose the graph to illustrate your answer to Part (b). d. Which motor should be selected? Click the icon to view the datatable for the additional information about two alternatives. Click the icon to view the interest and annuity table for discrete compounding when the MARR is 8% per year. a. The annual cost of electrical power for Motor A is $(xX). (Round to two decimal places.)
How much twisting moment in kg-m is required to drive the shaft of the motor couple to a pump with a rotational speed of 2000 rpm. The pump efficiency is 90% and can deliver 3000 gallons per minute of cold water to a height of 150 feet.
A fuel pump is delivering 50 gals/min of oil with a specific gravity of 0.75. The total head is 30 meters. Find the motor that is capable of handling this pump in horsepower. Assume pump efficiency of 70% and motor efficiency of 80%. Select from the available motors provided: 1hp, 1.25hp, 1.5hp, 2 hp.
What size pump is needed to supply 10 gpm to a cylinder when the electric motor is rotating at 1725 rpm? Assume 100% efficiency and state your answer in in3/rev to two decimal places.?
A centrifugal pump delivers 60 litres of water per second to a tank situated at a height of 20 metres. If the overall efficieney of the pump is 70%, find the power required for the pump. (Ans. 16-8 kW) 1.
A pump discharges 50 tons of water per hour to a height of 8 m, overall efficiency of the pumping system being 69%, what is the input and output power?
1. Determine the power delivered by the pump in kW 2. Determine the pressure head at point 2 in meters. 3. Determine the pressure head at point 1 in meters Thanks
A water pump develops a total head of 200 feet. The pump efficiency is 80% and the motor efficiency is 87.5%. If the power rate is 1.5 cents per kWh, what is the power cost for pumping 100 gal/hr?A. 34 cents per hourB. 1.34 cents per hourC. 2.34 cents per hourD. 3.34 cents per hour
4. An electric motor is used to drive the shaft of a small water pump. During a performance test, the torque on the motor shaft is found to be 8.23Nm when the motor is drawing 716 W of electrical power. What is the rpm of the pump shaft if it has an efficiency of 76%?
A fountain and a water tank will be powered by water from a nearby lake. The elevations and pipe connections are depicted in the diagram below. The fountain's jet water should reach a height of at least 2.5 m from the nozzle outlet. The tank, on the other hand, is elevated to allow gravity to distribute water. The table below contains the specifications for nozzles, suction and discharge pipes. What is the minimum power input to the pump in kW, assuming negligible minor head losses? Assume that the pump efficiency is 88 percent and the motor efficiency is 95 percent. The fountain's water is returned to the lake via a drainage system.
2. A pump draws water from a lake delivered to a height of 50 meters above the lake and encounters 15 meters of headloss. Determine the pump power requirement in Kilo-Watts to deliver a constant supply of 500 Liters per second? The correct answer has a margin of 1 from exact answer. Velocity head is neglected.
We have a system that must pump 195 GPM, at a height of 85 meters, and its losses byaccessories are 5% of their static load, please indicate the operating point and choose the impeller thatbest fits between the options of the graph A, B, C, D and F, indicate what is the expected returnof this pump, which would be the expected consumption in Hp.