Starting from the general expression of the Navier-Stokes equations in cylindrical coordinates, provide the form of the equations for an axisymmetric, steady flow. Explicitly write down the continuity equation as well as the momentum equation in all relevant directions in terms of partial derivatives. (Hint: How much is uθ for this flow? Explain why. How much is ∂/∂θ ?

IMPORTANT NOTE: Please have the answer complete, clear and computer generated!!

A closed rectangular tank 1.2 m high, 2.4 m long and 1.5 m wide is two-thirds full of gasoline (specic gravity 0.8). Calculate the acceleration which may be imparted to the tank so that the bottom front end of the tank is just exposed. Also calculate the total forces on each end of the tank and show that the dierence between these forces equals the unbalanced force necessary to accelerate the liquid mass in the tank.

A rectangular tank 1.5 m wide, 3 m long and 1.8 m deep contains water to a depth of 1.2 m. Find the horizontal acceleration that may be imparted to the tank in the direction of its length so that

1. the water is just about to spill

2. the front bottom corner of the tank is just exposed.

3. the bottom of the tank is exposed to its midpoint.

For (2) and (3) above, compute the volume of the water that would spill out from the tank. Also compute the total forces on each end of the tank in each of the cases and show that the dierence between these forces equals the unbalanced force necessary to accelerate the liquid mass in the tank.

Is it possible to obtain an average coefficient of friction greater than unity in metal cutting? What about orthagonal metal cutting?

QUESTION 16 – COOLING TOWERS AND EVAPORATIVE CONDENSERS Water flows at 5000 kg/h and 40°C into a cooling tower and is cooled to 26°C. The unsaturated air enters the tower at 20°C with a relative humidity of 0.4. It leaves as saturated air at 30°C. The pressure is constant at 1 bar throughout. Calculate (a) the mass flow of air per hour. (b) the mass of water evaporated per hour.

A centrifugal pump lifts water against a head of 36m, the manometric efficiency being 80%. The suction and delivery pipes are both 150mm bore, the impeller is of 375mm and 25mm wide at the outlet; its exit blade angle is 250 and the specific rotational speed is 1320 rev/min. If the total loss by friction in the pipeline at this speed is estimated at 9m, calculate the probable rate of discharge at this speed.

A 0.2 m3 rigid tank contains 5 kg of water (in any phase or phases) at 600 kPa. Which of the following values is closest to the temperature of the water in the tank?

a)159 ℃

b)389

c)381

d)246

e)152

1-Sketch and explain difference among typical metal, ceramic and polymer behavior through stress-strain diagram.Sketch and explain difference among typical metal, ceramic and polymer behavior through stress-strain diagram.

Text Book- The Science and Engineering of Materials, Askeland et al. (seven edition)

Home Work- # 6 for Chapter 6

please sovle the question and type the answer in the computer

thanks,

An embossing press in which a single-acting cylinder is used for ejecting the processed parts, with the help of circuit diagrams, describe how the cylinder can be activated using 2/2 and 3/2 valves. Compare the two diagrams with regard to extension and retraction of the piston rod and draw your conclusions. Also, calculate the advancing pressure (p) for a piston rod whose diameter d = 60 mm and with a load weight F = 5 kN. Ignore the resistances for this calculation.

A solid and hollow shaft, connected by a coupling, transmit power. The outside diameters of the shafts are the same and the inside diameter of the hollow shaft is 75% of its outside diameter. The solid shaft is three times as long as the hollow shaft. Take the modulus of rigidity for both shafts as 80 GPa. (a) If the angle of twist for the solid shaft is 1 degree, find the angle of twist for the hollow shaft. (b) If the maximum shear stress for the solid shaft is 30 MPa, find the maximum stress in the hollow shaft.

A compound thin cyclinder has a common diameter of 100 mm and the inner cylinder has a thickness of 2.5 mm. The radial pressure between the two cylinders is 200 kPa and the difference between the two common diameters before shrinkage was 4.305×10-3 mm. Determine (a) the thickness of the outer cylinder (b) the resultant hoop stresses in both cylinders if the compound cylinder is subjected to an internal pressure of 180 kPa. (E = 200 GPa)

There has been a lot of interest about replacing gasoline with ethanol, but is this really a good idea? We’re going to compare a blend of ethanol (70% ethanol and 30% gasoline by volume) to gasoline. Calculate the lower heating value (LHV) of a 70% ethanol/30% isooctane mixture in terms of kJ/mol of fuel. Assume complete combustion. How does this compare to the tabulated value for gasoline (isooctane)? Assuming a 20% thermal efficiency, if you need to get 100 kW of power from an engine, how much of each fuel (in mol/s) do you need? If you have a stoichiometric mixture of the ethanol/gasoline blend and air in your 100 kW engine, how much CO2 are you emitting in g/s? How does this compare to the same engine running a stoichiometric mixture of 100% gasoline and air?

6. The power of a test in hypothesis testing is given by:

Select one:

a. 1+ß

b. 1-ß

c. (1+ß)/ ( 1-ß)

d. 1/ß

7. The power of a test in hypothesis testing is given by:

Select one:

a. 1+ß

b. 1-ß

c. (1+ß)/ ( 1-ß)

d. 1/ß

8. Which of the following is a disciplined procedure for systematic evaluation of the impact of potential failures and thereby determining a priority of possible actions that will reduce the occurrence of such failures?

Select one:

a. Pareto diagrams

b. Matrix plot

c. FMECA

d. Fish bone diagram

9. The difference between the company’s level and that of the best practice for that performance measure is identified as the gap. The analysis that focuses on methods and processes to reduce that gap and thereby improve the company’s competitive position is known as____________ .

Select one:

a. Balanced scorecard analysis

b. None of these

c. Gap analysis

d. QFD

10. Vendor certification occurs when the vendor has reached the stage at which it consistently meets or exceeds the purchaser’s expectations?

Select one:

a. true

b. false

26. Select the odd one out

Select one:

a. Zone control

b. Paint strips

c. Imbedded wire

d. dead reckoning

27. An AGV has an average speed of 50 m/min. how much distance it can travel in an hour given that it is working in a factory layout in which it has availability factor of 0.9 and traffic factor of 0.95

Select one:

a. 3 km

b. 2.5 km

c. 3.5 km

d. 2 km

28. In which of the automated storage systems the storage chambers moves

Select one:

a. Transfer line

b. Dollies

c. Carousel

d. ASRS

29. which of the following G code is used for giving cutter radius comensation

Select one:

a. G44

b. G40

c. G41

d. G43

30. Which of the device make it possible to use a single microprocessor to capature data from n number of sensors

Select one:

a. Operational amplifiers

b. ADC

c. Multiplexer

d. DAC