A pump takes water at 60°F from a large reservoir and delivers it to the bottom of an open elevated tank 25 ft above the reservoir surface through a 3 inch ID pipe. The inlet to the pump is located 10 ft below the water surface, and the water level in the tank is constant at 160 ft above the reservoir surface. The pump delivers 150 gpm. If the total loss of energy due to friction in the piping system is 35 ft·lbf/lb, calculate the horsepower required to do the pumping. The pump and its motor have an overall efficiency of 55 percent. write out the equations you use. specificy what each variable stands for.

Explain the definition of AR (Augmented Reality) and suggest further problems about expanding services from it.

A sand particle has an average diameter of 1 mm and a shape factor of 0.90 and a specific gravity of 2.1, determine the terminal velocity of the particle settling in water at 20^oC (kinematic viscosity of water = 1.003 x 10^-6 m²/s and specific gravity = 1) Drag coefficient can be computed using the formula:

Cd= 24/Re +( 3/sqrtRe ) + 0.34

  Answer: 0.1419 m/s

Give a description of polymer silk

1) Why is considered as an advanced material?

2) Why does behave like an advanced material?

3) What are the applications where we can use it?

Acetic acid is to be extracted from benzene into water at 25C. 100 kg/h of a feed that is 0.0092 wt. fraction acetic acid and 0.9908 wt. fraction benzene is fed to a column. The inlet water is pure and flows at 25 kg/h. The desired outlet weight fraction is 0.00040 acetic acid in benzene. Assume total flow rates are constant, water and benzene are completely immiscible, eqilibrium is linear.

K=y/x = wt. fraction solute in extract/wt. fraction solute in raffinate = 30.488

Determine the weight fraction of acetic acid in the water and the required number of stages.

A model centrifugal pump with impeller diameter 365 mm is tested at its design operating condition. The test gives the following data when pumping water, speed = 870 rev/min head = 18.9 m capacity = 73.7 L/s efficiency = 89%.

A geometrically similar pump is to be designed to pump a fluid with relative density 0.78 against a head of 85 m with a flow of 450 L/s.

Determine:

A) The impeller size?

B) The speed?

C) The power input at the design point of the prototype pump?

To show how the R^4 dependence of the Poiseuille law affects flow rate, calculate the bulk fllow through a 12 in. long fire hose nozzle with an inner diameter of 2 in. delivering water with n= 0.01 = 0.01 poise from a pressue of 100 psi and exiting to a pressure 14.7 psi. Assume there is a pump which can provide the necessary volume and give the answer in gallons/min. Please show work. Thanks!

Use the phase rule to determine the degrees of freedom of each of the following equilibrium systems and give a possible set of variables that may be specified:

a: NaCl crystals suspended in an aqueous NaCl solution

b: Humid air in equilibrium with condensed water (dry air may be considered a single species)

c: a vapor-liquid mixture of four hydrocarbons

d: a gaseous mixture of H2,Br2, and HBr, given that the single reaction: H2 + Br2 <-> 2HBr, has proceeded to equilibrium

Health in the Workplace

Part 1

Don Hayward is employed as a chemical engineer at ABC Manufacturing. Although he does not work with hot metals himself, he supervises workers who are exposed to hot metals eight hours a day, five days a week. Don becomes concerned when several workers develop respiratory problems and complain about "those bad smelling fumes from the hot metals". When Don asks his superior, Cal Brundage, about air quality in the workplace, the reply is that the workplace is in full compliance with OSHA guidelines. However, Don also learns that OSHA guidelines do not apply to chemicals that have not been tested. A relatively small percentage of chemicals in the workplace have actually been tested. This is also the case with the vast majority of chemicals workers are exposed to at ABC.

Should Don do anything further, or should he simply drop the matter?

Part 2

Don goes to ABC's science library, talks to the reference librarian about his concerns, and does a literature search to see if he can find anything that might be helpful in determining why the workers have developed respiratory problems. He finds the title of an article that looks promising and asks the reference librarian to send for a copy. The librarian tells Don that the formal request must have the signed approval of Cal Brundage.

Don fills out the request form and sends it to Cal's office for approval. One month later the article has still not arrived. Don asks Cal about the request. Cal replies that he doesn't recall ever seeing it. He tells Don that it must have gotten "lost in the shuffle." Don fills out another form and this time personally hands it to Cal. Cal says he will send it to the reference librarian right away.

Another month passes by and the article has not arrived. Don mentions his frustration to the reference librarian. He replies that he never received a request from Cal.

What should Don do now?

Explain why polyacetylene is an electrical conductor whereas polyethylene.

1.7 kg/s NH3 and 20 m3/s air at 25 oC and 1 atm are fed into a reactor in which the ammonia is completely consumed. The product gas emerges at 300 oC. Calculate the rate at which heat must be transferred to or from the reactor, assuming operation at approximately 1 atm. You must show full systematic working.

The standard heat of reaction for the oxidation of ammonia is given below: 4 NH3(g) + 5 O2(g) ? 4 NO(g) + 6 H2O(v): ?Hor = -904.7 kJ/mol
Note: The enthalpy of NO at 300 oC, relative to 25 oC, is 8.453 kJ/mol

We have the reaction  
2 A(aq) +B(aq) + 3 C(aq) ? 2 D(aq) + 2 E(aq) + 3F(aq) .  
At 25^oC, we start with a solution that is 0.977 M in A(aq), 0.655 M in B(aq), and 0.911 M in C(aq). There is no D(aq), E(aq), or F(aq) present. Equilibrium is established, and at equilibrium, the concentration of C(aq) is 0.677 M. What is the value of the equilibrium constant, K, for this reaction? What is the value of ?G^o for this reaction? For this reaction, we have another experiment where we only start with D(aq), E(aq), and F(aq). At equilibrium, the concentrations of D(aq), E(aq), and F(aq) are, respectively, 0.211 M, 0.322 M, and 0.255 M. What is the concentration of B(aq) at equilibrium? The temperature is still 25^oC.

a) What are edge and screw dislocations and why are they important in metals?;

b-) Make a 2D sketch of an edge dislocation using the ball and stick model of the crystalline state and show its salient features such as extra-half plane, dislocation core, state of stress above and below the slip plane, and Burger’s vector. What does the Burgers vector designate?;

(c-) Why does dislocation slip take place on closed packed crystallographic planes and along close packed crystallographic directions? Why is screw dislocation slip easier than edge dislocation slip in metals? Why dislocation motion (slip) is not possible at room temperature in ionic solids such as NaCl?

- The dissolution of polymer can be thermodynamically described in 2 steps. Describe it.

- Describe the process of protein flocculation at its isoelectric point?

1. What are the main feed and product components of FOB(fuel oil block) and LOB(Lube oil block)?

2. Which particular unit does the following final product come from

a. gasoline

b. jet fuel

c. candle wax

d. naphtha

3. where does the refinery get their water from and how do they handle water disposal?

4. how do they process their chemical waste disposal?