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

a It was observed that natural frequency of a torsional pendulum when vibrating in vacuum is 280Hz. But, the damping frequency is 220Hz when the same pendulum is dipped in an oil of specific gravity 0.9. Find the value of damping factor of the oil. (Hint: There is no damping in case of vacuum)

b A vibratory system weighing 1.5tonnes has the the following successive amplitudes: 5.00, 3.15, 2.00, 0.75, 0.50, 0.30, 0.20, 0.10 mm respectively. The time gap between two successive cycles is 0.64s. Draw the displacement-time graph of the system. Also, calculate the damping ratio, natural frequency and stiffness of the associated spring

11. Solubility of O₂ _______________with the increase in temp.

Select one:

Increases

Decreases

No Change

12. For isokinetic sampling, static pressure at nozzle tip should be _____________than that of free stream

Select one:

Less

More

Equal

13The DO level in the water _________ from 12.30 pm to 3.30pm.

Select one:

Increasses

Decreases

Remains same

14. Which of the following particulate matter are collected in collection devices in steel industry?

Select one:

Oil

Acetic acid

Iron oxide

Boron

15. Eutrophication causes decrease in __________

Select one:

Dissolved hydrogen

Dissolved salts

Dissolved oxygen

All of the above

1 In Oxygen-Sag Curve, at the critical point, the rate of reaeration becomes ________ the rate of Deoxygenation

Select one:

Double

Equal to

Half

2. In general, adsorption of a gas on solid surface is_________process

Select one:

Endothermic

Exothermic

None

3. Which of the following tests can be performed in relatively shorter period of time?

Select one:

TOC

BOD

COD

All require same time

4. In Claus process, H₂S is converted to____________

Select one:

SO₃

disulphide

Elemental Sulphur

5. Which of the following Samples provide more meaningful data when the composition of waste varies with either time or flow?

Select one:

a.Grab

b.Composite

Both 'a' and 'b'

None

Saturated water vapor at 1000 kPa is throttled to 100 kPa. The velocity of the steam remains constant through the process. Determine the exit temperature of the water vapor. I know this is already awnsered in a solution for 1st edition but can someone help me understand what they do and how they picked the numbers they did from some table to get the exit temperature?