Quesiont is

'Explain Luder's band in detail. Make reference to the yield point, dislocation motion and solute atoms'

You are starting a new job at a plant that makes computer boards. You  are responsible for putting the components on the board and also to do soldering.   What should you be oriented on? What do you feel is key to your success at this new job? Why?

Define any two (i) PVC (ii) Glass Transition Temperature (iii) LDPE and (iv) Thermoplastics

A double-pipe heat exchanger is designed as an engine oil cooler. The flow rate of oil is 5 kg/s, and it will be cooled from 60°C to 40°C through annulus (ID = 0.10226 m, OD = 0.1143 m). Sea water flows through the tubes (ID = 0.02664 m, OD = 0.03340 m) and is heated from 10°C to 30°C. The number of bare tubes in the annulus is 3, and the length of the hairpin is 3 m. Assume that the tube wall temperature is 35°C. Design calculations give the number of hairpins as 85. Allowable pressure drop in the heat exchanger for both streams is 20 psi. Is this design acceptable? Outline your comments.

For a eutectoid steel, describe isothermal heat treatments that would be required to yield specimens having the following tensile strength-ductility (%RA) combinations:

(a) 900MPa and 30% RA

(b) 700MPa and 25% RA

What is the difference between superalloys and high-temperature stainless steel?

What are the materials used in an airplane engine for high-temperature purposes?

Explain the reason for using each material.

What are the most common alloying elements used in stainless steel materials?

What are the effects of each alloying elements on steel?

A squared cross- sectional bar of 3cm by 3cm is under a compressive stress of 300 MPa. The bar deforms elastically, what is the area of the cross section after deformation. Provide your answer in milimeters squared. (Do not type in the unit in your answer.) (E=30GPa, v=0.4)

(Maintenance Engineering) In assigning job priorities, it is important to consider some factors like

Compare and contrast the relative merits and demerits of Reactive maintenance and Predictive maintenance.

Consider the following combined cycle. The mass flow rate of air is 73 kg/s. Air enters the compressor at state 1 with Patm =1 atm and Tamb = 20°C. The compressor has a pressure ratio of 7.5 and an efficiency ?c = 0.85. Air enters the combustor and is heated to a temperature TH = 1250°C. The turbine has an efficiency of ?t,1 = 0.87. The air leaving the turbine enters the steam boiler where it transfers heat to the water in the Rankine cycle. The ratio of the mass flow rate of water in the Rankine cycle to air in the Brayton cycle is 0.1. The water leaving the boiler achieves temperature of 550°C. After boiling the water in the Rankine cycle, the remaining heat left in the Brayton cycle will be used to produce steam for industrial processes. The air enters the steam generator after leaving the boiler and is used to heat water from the inlet state of 5 atm, 20°C to saturated vapor. The temperature of the air leaving the steam generator is 180°C. In the Rankine cycle, the water enters the pump as saturated liquid at 55°C. The pump efficiency is ?p = 0.65 and the exit pressure of the pump is Pboiler = 8.0 MPa. The water enters the heat exchanger (boiler) where it is converted to steam by the heat transfer from the air. The steam turbine has an efficiency of ?t,2 = 0.84. The condenser transfers heat from the water to a river cooling water entering the condenser at Tamb = 20°C. Due to EPA regulations the temperature of the river water at the exit of the condenser cannot be more than 5°C higher than at the inlet.

a.) [20 points] Draw the T-S diagram and the line/component diagram for this combined cycle.

b.) [20 points] Determine all of the state points for this combined cycle. You may consider creating a table including all relevant points with at least the pressure, temperature, entropy and enthalpy.

c.) [10 points] Determine the mass flow rate of steam for industrial purposes produced in the steam generator.

d.) [10 points] Determine the efficiency of the Brayton cycle, the efficiency of the Rankine cycle, and the efficiency of the combined cycle (relative to producing power - do not include the value of the industrial steam that is produced).

e.) [10 points] What is the net power produced by the cycle?

f.) [10 points] If natural gas is used to energize the cycle and the cost of natural gas is NGc = 8$/million Btu determine the yearly fuel cost required to run the plant.

g.) [10 points] Determine the cost associated with producing the same amount of power using a conventional natural gas fired plant with efficiency ?conv = 0.34 and the same amount of steam using a natural gas fired boiler. What are the savings per year associated with using the combined cycle?

h.) [10 points] If natural gas produces 100 lbm of CO2 per million Btu, what is the environmental impact of using the combined cycle versus the conventional natural gas power plant (include power and industrial steam generated).

4-) Given the following data:

Drilling Fluid Density : 12 ppg

Well Depth: 10,000 ft.

Drill Bit Nozzle Sizes: 13-13-13

Pump Horsepower: 1800

Pump Volumetric Efficiency: 80%

Maximum Pump Pressure: 4,500 psi

Minimum Flow Rate: 350 gpm

Parasitic pressure losses of 2,173 psi and 1,388 psi are anticipated while circulating mud at flow rates 500 gpm and 390 gpm respectively.

a-) (10 points) Determine the parasitic pressure losses when the bit hydraulic horsepower is maximum.

b-) ( 5 points) Determine the optimum flow rate when the bit hydraulic horsepower is maximum.

c-) (5 points) Determine the pressure drop across bit nozzles when the bit hydraulic horsepower is maximum.

d-) (5 points) Determine the optimum sizes of three nozzles to be used for the next bit run, using the maximum bit hydraulic horsepower criteria.

2. A Carnot cycle using water as the working fluid operates within the wet region (saturated conditions). If the high pressure for the process is 500 psia and the low pressure is 20 psia, what is the thermal efficiency for the cycle?  State your answer as a percent to one decimal place. Example: 32.5

7. In a Rankine cycle steam enters the turbine at 900 psia and 1000^oF and exhausts at 1 psia. Determine the heat supplied to the cycle in BTU/lbm.

State your answer to one decimal place. Example: 123.5

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