if the pilot light on a gas water heater will not stay lit... what seem to be the problem?

From an iron-carbon phase diagram, plotted in terms of weight percent carbon:

A) What is the composition in weight percent of the iron-carbon alloy that has the lowest melting temperature? What is this melting temperature?

B) What is the composition in weight percent of the iron-carbon alloy that has the eutectoid composition? What is the eutectoid temperature?

C) What is the lowest temperature and weight percent carbon at which any iron-carbon alloy shows any amount of delta phase?

D) A particular iron-carbon alloy shows a final microstructure after slow cooling that consists of 80% proeutectoid ferrite and 20% pearlist. What is the carbon composition of this alloy, in weight percent?

E) At what temperature would the alloy from part d become all single-phase austentite on heating?

F) At what temperature would the alloy from part d become all liquid on heating?

The following information is for a proposed project that will provide the capability to produce a specialized product estimated to have a short market (sales) life before new technology, known to be in the R&D stage, makes it obsolete:

• Capital investment of $1,000,000, composed of $420,000 of depreciable equipment and $580,000 of non-depreciable capital (land, working capital, etc.)

• Assume that the depreciable property is in the MACRS (GDS) three-year property class.

• The study period is 3 years

• Annual operating and maintenance costs are $636,000 in the first year and increase at a rate of 6% per year.

• The estimated salvage value at the end of year 3 is $280,000

• The effective tax rate (combined federal and state) is 38%

• Assume that the recovered capital (salvage value – book value) is taxed at the same rate as taxable revenue

• After tax MARR is 10% Based on an after-tax analysis using net present value, what is the minimum amount of uniform annual revenue required to justify the project economically?

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Consider a vapor power cycle as shown below. Steam enters the first turbine stage at 12 MP a, 480 oC, and expands to 2 MP a. Some steam is extracted at 2 MP a and fed to the closed heater. The remainder expands through the second-stage turbine to 0.3 MP a, where an additional amount is extracted and fed into the open heater operating at 0.3 MP a. The steam expanding through the third-stage turbine enters the condenser at a pressure of 6 kP a and leaves the condenser as saturated liquid at 6 kP a. Liquid water leaves the closed heater at 210 oC, 12 MP a, and condensate exiting as saturated liquid at 2 MP a is trapped into the open heater. Saturated liquid at 0.3 MP a leaves the open heater. Assume all pumps and turbine stages operate isentropically. Determine for the cycle: (a) the heat transfer to the working fluid passing through the steam generator, in MW, (b) the heat transfer from the working fluid passing through the condenser, in MW, (c) the thermal efficiency (%), and (d) sketch a T ?s diagram for the entire cycle with labeled states, isobars, and process directions

Sketch and label the parts of a standard roller chain.

1. Two samples of a low hardness steel were tested using a Rockwell C hardness tester and the Rockwell B scale at the same lab on the same day. The difference between the average hardness of the two samples was 0.5 Rockwell C. Do you think there is a significant difference in the hardness? Justify your answer.

2. Two manufacturers produce a steel. Manufacturer B claims their steel is better than manufacturer A because their average Rockwell B hardness is 68.4 HRBW while that of manufacturer B is 60.5 HRBW. Do you think there is a significant difference in their hardness? Justify your answer. Hint: Use the specification!!

3. Find an important engineering failure that involves some of the topics discussed in MSE 350. Describe the failure, why it occurred, the damage (human, environmental, and economic) and the changes that could have been made in the design to avoid the failure. Was the failure caused by lack of engineering knowledge at the time, engineering error, or management/government error? Discuss!!

4.

For each of the following common items, identify what they are commonly made of, the material type (composite, metal, semiconductor, polymer <thermoplastic, thermoset or elastomer>, ceramic, glass. Describe why that material type is used. Include at least two references for your answers (websites are fine, but try and find good ones). If more than one material type is used in the items, include them all! Be careful to use proper engineering vocabulary when answering this question!

Abrasives for grinding metal

Automobiles

Integrated circuits

Airplanes

Bridges

Solar panels

Latex paint

Soda bottles

Polyvinylchloride (PVC) plumbing pipes

The dry and wet-bulb temperatures of atmospheric air at 95 kPa are 25C and 20C, respectively. Determine (a) the specific humidity, (b) the relative humidity), and (c) the enthalpy of the air in kj/kg dry air.

Design a straight ended helical torsion spring for a static load 200 N-m at a deflection of 45 deg with a safety factor of 1.8. Specify all parameters necessart to manufacture the spring state all assumntions. You make the following design choices:

*Use unpeened oil tempered wire with 40mm long, straight ends. The coil is loaded to close it

* Design safety factory Nyd=1.8

*spring index C=11

*Yield Strength Factor K=0.85

*length of the ends L1=40 mm=L2

*Material choice = ASTMA299wire

The data listed below are claimed for a powercycle operatingbetween reservoirs at 527_C and 127_C. For each case,determine if any principles of thermodynamics would be violated.

(a) QH = 700 kJ, Wcycle = 400 kJ, QC = 300 kJ.

(b) QH = 640 kJ, Wcycle = 300 kJ, QC = 240 kJ.

(c) QH = 640 kJ, Wcycle = 400 kJ, QC = 300 kJ.

1. What would be the maximum concentration of Toluene (PEL 200 ppm) that an atmosphere could contain if your air purifying respirator has been tested with the following results: mask concentration of nontoxic gas 10 ppm.

2. A respirator cartridge that has an orange stripe on a black label would indicate use in what situation?

please type answer. some are written on paper and are hard to read

Problem 3: Fit the following data with a parabola. Use both Newtonian and Lagrangian interpolating polynomials. x 0.75 2 3 4 6 8 8.5 y 1.2 1.95 2 2.4 2.4 2.7 2.6

1. If 0.05kg of a gas occupying a volume of 0.03m3 at 1.025 bar is compressed reversibly until the pressure is 6.15 bar. Calculate the final temperature, the work done on the gas and the heat flow to or from the cylinder wall when;
a. the process is according to a law PV^1.4=K 
b. the process is isothermal
c. the process takes place in a perfectly thermally insulated cylinder.

-What type(s) of effects are the radiation protection standards trying to prevent?

type the answer please

A certain amount of viscous fluid is placed onto a flat surface. Determine the pi terms that describe the fluid spreading out over the plate as time progresses. For example, these pi terms would describe honey spreading out over a countertop after a drop of it was spilled, or oil spreading on a garage floor after leaking out of a container.

When a safeguard is said to be "muted", what does that means?