A proposed water tank on the sixth floor (roof top) of the UTPA administration building would be used to supply pressurized water for the campus. A pump fills the tank at a rate of 15.6 kg/s. What size motor (hp) is needed to operate the pump given the data below? The motor size (hp) must be 20% greater than the required pump work. Note: Give the motor size as a positive value. The pump includes the riser pipe to the tank. There is no heat transfer from the pump to the surroundings (i.e., adiabatic conditions).

Pump Inlet Temperature = 20oC Pump

Inlet Pressure = 192 kPa

Pump Inlet Diameter = 11.7 cm

Pump Inlet Elevation = 24.7 m

Pump Exit Temperature = 20oC

Pump Exit Pressure = 269 kPa

Pump Exit Diameter = 5.4 cm

Pump Exit Elevation = 49.7 m

correct answer: 8.65 ± 5%

MFGE 336 Production Engineering

1.  List and describe the 2 mainly utilized locating methods

2. What are the three fundamental categories of workpiece location?

Please answer both question

Indicate the most appropriate viscoelastic property to be considered for the following applications:

Heat build-up during tensile fatigue of a polyethylene

Tire flatspotting

Optimal noise abatement characteristics of a machinery mount

Energy stored in a polymer after a creep test in shear

Monitoring the rate of cure of an epoxy resin

A single-dwell cam will do the following profile: rise 5 inches for 90 degree, return 5 inches for 90 degree, dwell 180 degree. Generate the displacment, velocity, acceleration, and jerk curves three times using simple harmonic, cycloidal, and eighth order polynomials for both rise and return. Discuss which result is best given your analysis of the three sets of acceleration and jerk curves.

Suppose you are the manager of a popular cosmetic company. Your top selling brand requires both chemicals and labor. Two production processes are available: Process 1 transforms 1 unit of labor and 2 units of chemicals into 3 oz of perfume. Process 2 transforms 2 units of labor and 3 units of chemicals into 5 oz of perfume. It costs your company $3 to purchase a unit of labor and $2 to purchase a unit of chemicals. Each year, up to 20,000 units of labor and 35,000 units of chemicals can be purchased. In the absence of advertising, you believe your company can sell 1,000 oz of perfume. To stimulate demand for your perfume, you can hire a model. The model is paid $100/hour. Each hour the model works for your company is estimated to increase the demand for the perfume by 200 oz. Each ounce of the perfume sells for $5. Formulate a mathematical model that, when solved, maximizes profits.

Do not present your work in Excel.

The isentropic efficiency of an ammonia, NH3, refrigeration plant is 0.88. The ammonia enters the compressor as dry saturated vapour at -16 ? and leaves the compressor in a superheated state at 11.67 bar. The refrigerant is then condensed and undercooled by 4K at constant pressure before being expanded at -16 ?.

(NEED TO USE STEAM TABLES FOR NH3, PLEASE ONLY ANSWER IF YOU HAVE A GOOD UNDERSTANDING OF REFRIGERTION)

a)Draw a schematic of the plant and the cycle on T-s and P-h coordinates.

Calculate:

b (i) the superheat temperature at the exit of the compressor

b (ii) the compressor work

b(iii) the refrigeration effect

b(iv) the coefficient of performance of the plant

b(v) the volume flow rate of the refrigerant measured at the compressor inlet for a plant refrigeration capacity of 500kW.

DATA Assume that the cp of ammonia at 11.67 bar is 4.86 kJ/kg

PLEASE DON'T JUST MAKE UP THE ANSWERS.

ANSWERS;

bi)118.1 oC

b(ii) 278.9 kJ/kg

b (iii) 1121.6 kJ/kg

b(iv) 4.02

b (v) 0.0493 m3 /s

How to model an inverted pendulum in matlab and simulink?

how to increase the separation efficiency for flash separator??

what is the effect of diameter and height of flash separation on its operation??

In a single stage impulse turbine, the nozzles discharge the fluid on to the blades at an angle of 25 o to the plane of rotation, and the fluid leaves the blades with an absolute velocity of 300 m/s at an angle of 120 o to the direction of motion of the blades. If the blades have equal inlet and outlet angles and there is no axial thrust, estimate the blade angle, power produced per kg/s of fluid, and diagram efficiency. Steam at 7 bar and 300 o C expands to 3 bar in an impulse stage. The nozzle angle is 20 o , the rotor blades have equal inlet and outlet angles, and the stage operates with the optimum blade speed ratio. Assuming that the isentropic efficiency of the nozzles is 0.9, and that the velocity at entry to the stage is negligible, deduce the blade angle used and the mass flow required for this stage to produce 75 kW. A ten-stage axial flow compressor provides an overall pressure ratio of 5:1 with an overall isentropic efficiency of 0.87, when the temperature of the air at inlet is 15 o C. The work is divided equally between the stages. A 50 per cent reaction design is used, with a blade speed of 220 m/s and a constant axial velocity through the compressor of 170 m/s. Estimate the blade angles.

A vertical shaft Kaplan turbine operating under a head of 9.8 m has a runner diameter of 9.3 m. At the maximum optimum point, the turbine runs at 51.7 rpm and develops 45,000 kW power discharging 535 m 3 /s water. Determine the values of unit speed, unit discharge, unit power and specific speed of the turbine. If the critical value of cavitation coefficient for the runner is 0.95, determine the location of the runner with respect to the tail race water level. The atmospheric and saturated vapour pressures may be taken as 9.8 m and 2.5 m respectively. Will the runner be located below or above the tail race water level? [ 59 . 153 ? u N , 989 . 1 ? u Q , 96 . 16 ? u P , 51 . 632 ? s N , 01 . 2 ? ? s H , below] 2. Calculate the diameter, speed and specific speed of a propeller turbine runner to develop 6,250 kW under a head of 5 m, given that the speed ratio Ku based on the outer diameter is 2.10, flow ratio ?=0.65. Assume the diameter of the boss (hub) is 0.35 times the external diameter of the runner and overall efficiency is 85 %. [D = 5.81 m, N = 68.37 rpm, Ns= 722.93] 3. A hydraulic turbine develops 130 kW at 230 rpm under a head of 16 m. Determine the scale ratio and the speed of a similar machine which will generate 660 kW when working under a head of 25 m. [Scale ratio (D2/D1) = 1.612, N2 = 178.35 rpm]

A centrifugal pump has the following characteristic: outer diameter of impeller 800 mm,

width of impeller vanes at outlet 100 mm, angle of impeller vanes at outlet 40 o . The impeller

runs at 550 rpm and delivers 0.98 m 3 /s of water under an effective head of 35 m. A 500 kW

motor is used to drive the pump. Determine the manometric, mechanical and overall

efficiencies of the pump. Assume water enters the impeller vanes radially at inlet.

[ ?mano = 81% , ?m = 83% ?o = 67%].

5. A centrifugal pump has an impeller 0.29 m diameter running at 960 rpm with an effective

outlet vane angle of 28 o . The velocity of the flow (assumed uniform throughout the system)

is 2 m/s. The static suction lift 2.8 m. The energy losses in metres of water are: suction pipe

0.61 m, in impeller 0.49 m, and in volute casing 0.88 m. From these particulars, calculate

the readings of vacuum or pressure gauges placed at (i) inlet of the pump (ii) impeller outlet

(in clearance space between impeller and volute), iii pump outlet or delivery flange located

0.2 m above the centreline of the pump.

[ (i) – 3.614 m, (ii) 6.01 m (iii) 10.89 m ]

6. Water is to be pumped out of a deep well under a total head of 95 m. A number of identical

pumps of design speed 1000 rpm and specific speed 900 rpm with a rated capacity of 150

litres/s are available. How many pumps will be needed and how should they be connected.

[ 3 pumps, connected in series ]

The quantity of water available for a hydroelectric station is 273 m3/s under a head of 18 m. Assuming the speed of the turbines to be 150 rpm and the efficiency 82%. determine the least number of identical machines that be needed if (i) Francis turbines whose Ns must not exceed 395, (ii) Kaplan turbines whose Ns must not exceed 690 are chosen, What would be the individual power output of the unit in the cases [ i. Francis P = 9,532 kW, no. of turbines = 5, ii. Kaplan P = 29087 kW, no. = 2 ]