Why is motor impeller rotation so critical for 3-phase centrifugal pumps?Select the best answerWastewater could backwash into the potable water supplyImpellers spinning in the wrong direction will create a vacuum in the linePumping efficiency plummets when the impeller spins in the wrong directionIt can indicate if the power is in the wrong phase

The introduction establishes the scene by emphasizing how crucial it is to comprehend the role that…

Answered: Why is motor impeller rotation so…

Understanding Business

12th Edition

ISBN:9781259929434

Author:William Nickels

Publisher:William Nickels

Chapter1: Taking Risks And Making Profits Within The Dynamic Business Environment

Section: Chapter Questions

Problem 1CE

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A wheel tractor-scraper is carrying a 50,000 lb load while operating on a level grade. Assume no power derating is required for equipment condition, altitude, and temperature. What minimum value of coefficient of traction between the tractor wheels and the traveling surface is needed to overcome an equivalent rolling resistance of 12%? For the fully loaded condition 40% of the weight is distributed to the drive axle. Operating weight of the scraper when empty is 70,000 lb.6.4 (5 pts) A wheel tractor-scraper is carrying a 50,000 lb load while operating on a level grade. Assume no power derating is required for equipment condition, altitude, and temperature. What minimum value of coefficient of traction between the tractor wheels and the traveling surface is needed to overcome an equivalent rolling resistance of 12%? For the fully loaded condition 40% of the weight is distributed to the drive axle. Operating weight of the scraper when empty is 70,000 lb.
Consider the mixing process shown in the figure. A mixing chamber initially contains 4 liters of a clear liquid. Clear liquid flows into the chamber at a rate of 10 liters per minute. A dye solution having a concentration of 0.25 kilograms per liter is injected into the mixing chamber at a constant rate of liters per minute. When the mixing process is started, the well-stirred mixture is pumped from the chamber at a rate of 10 + r liters per minute. (a) Develop a mathematical model for the mixing process. Let Q represent the amount of dye in kilograms in the mixture. (dQ/dt)=? (b) The objective is to obtain a dye concentration in the outflow mixture of 0.1 kilograms per liter. What injection rate r is required to achieve this equilibrium solution? r = ? Would this equilibrium value of r be different if the fluid in the chamber at time t=0 contained some dye? yes, no or maybe? (c) Assume the mixing chamber contains 4 liters of clear liquid at time t. How many minutes will it take…
a) A centrifugal pump has an impeller with dimensions r₁ = 75 mm, r2 = 150 mm, b₁ = 50mm, b2 = 30 mm, ẞ1 = ẞ2 = 30°. For a discharge of 70 L/s and shockless entry to vanes. compute (a) the speed, (b) the head, (c) the torque, and (d) the power. Neglect losses (α1 = 90°).
Assuming that you were hired as process engineer in a manufacturing company. Upon reporting for work, you noticed that some chain drive equipment are having too much slack. Adjusting the slack by stopping the equipment would be detrimental to the achievement of production target. You decided to have it corrected when the company goes into its scheduled preventive maintenance shutdown. What improvements would you do to correct and prevent this problem from happening? Explain your answer.
69) please help with this Output from a process contains 0.02 defective unit. Defective units that go undetected into final assemblies cost $25 each to replace. An inspection process, which would detect and remove all defectives, can be established to test these units. However, the inspector, who can test 22 units per hour, is paid $10 per hour, including fringe benefits. Should an inspection station be established to test all units? Assume that the line will operate at the same rate (i.e., the current production rate) regardless of whether or not the inspection operation is added. b. What would be the benefit (or loss) from establishing the inspection process? Note: Input the amount as a positive value. Round your answer to 2 decimal places.
A 10 station automated assembly system produces an ideal cycle time (Tc) of 14 seconds/cycle. When a defective part enters any assembly station it sometimes causes a station jam or stoppage. Defective parts occur at a rate of 0.07 and a jams due to defective parts occur at a rate of 0.4. When a jam occurs, it takes on average 74 seconds to clear and restart the station. Determine the production rate of acceptable parts (Rap) to the nearest 1 part/hour.
The Worthington Gear Company installed a bank of 10 robots about three years ago. The robots greatly in-creased the firm’s labor productivity, but recently attention has focused on maintenance. The firm does no pre-ventive maintenance on the robots because of the variability in the breakdown distribution. Each machine hasan exponential breakdown (or interarrival) distribution with an average time between failures of 200 hours. Eachmachine hour lost to downtime costs $30, which means that the firm has to react quickly to machine failure.The firm employs one maintenance person, who needs 10 hours on average to fix a robot. Actual maintenancetimes are exponentially distributed. The wage rate is $10 per hour for the maintenance person, who can be putto work productively elsewhere when not fixing robots. Determine the daily cost of labor and robot downtime.
A copier machine has a mean time between failures of 400 operating hours. Repairs typicallyrequire an average of 10 hours from the time that the repair call is received until service is completed. Determine the availability of this copier
What is an Interactive Single Variable process control loop? in details
Suppose that a (pA = 0.1, ps = 0.2, A = 1 min)-BSSQ Q is operating in steady state. Calculate E[|Q(x)|*].
There is a 4 percent error rate at a specific point in a production process. If an inspector is placed at this point, all the defects can be detected and eliminated. The inspector would cost $9 per hour and could inspect units in the process at the current production rate of 46 per hour. If no inspector is hired and defects are allowed to pass this point, there is a cost of $10 per defective unit to correct the defects later on. Assume that the line will operate at the same rate (i.e., the current production rate) regardless of whether the inspector is hired or not. a. if the inspector is hired, what will be the inspection cost per unit? b. if an inspector is not hired, what will be the defective cost per unit? c. should an inspector be hired based on costs alone?
Each breakdown of a graphic plotter table atAirbus Industries costs $50. Find the expected daily breakdown cost, given the following data:

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