A shaft inside the sleeve of a journal bearing is being rotated at 1500 rpm. The shaft is 6.00 cm in diameter and is rotating in a bearing sleeve that is 6.02 cm in diameter and 40 cm long. The clearance is filled with oil having properties of ?=0.003 m2 /s and SG=0.88.

a. Find the torque required to rotate the shaft.

b. Find the power required to rotate the shaft. (Answer: 44.1 kW)

c. Discussion: How do the torque and power change when the clearance is halved? How do the torque and power change when the bearing rotates at twice the speed? Note that this discussion requires that problems should be solved using variables and numbers are substituted as a last step. Doing this allows trends to be easily observed.

This is problem 8-13 from El-Wakil’s Powerplant Technology book – Consider a combined gas-steam turbine cycle with both machines ideal. Air enters the compressor at 1 atm and 500 degree R. 200 percent theoretical air gases enter the gas turbine at 2400 degree R. The pressure ratio for both compressor and turbine is 5.624. No intercooling, reheat, or regeneration are used in the gas-turbine cycle. The turbine exhaust is used directly without supplementary firing and leaves to the stack at 1000 degree R. Steam is produced at 1000 psia and 1000 degree F. The condenser pressure is 1 psia. No feedwater heating is used and the pump work may be ignored, Draw the flow and T-s diagrams labeling points correspondingly , and calculate (a) the heat added, per pound mass of air,(b) the steam flow per pound mass of air, (c) the combined work, in Btus per pound mass of air, (d) the combined plant efficiency, and (e) the plant efficiency if the steam cycle is inoperative.

Describe the pig iron manufacturing process (incl. reaction equations)

A pump must suck a well as deep as 20 m, water temperature 25 ° C, how the arrangement puts the pump depth so that water can be pumped perfectly, count and use the required table

1. A turbo pump works at 1200 rpm rotation, with the ability to raise water as high as 200 m as much as 650 liters / minute, which is driven by an electric motor. But because the electric voltage should be 220 volts decreased so that the pump shaft spindle only 1000 rpm with the character of the pump. The pump efficiency assumption is 85%.

a. How much power is needed if the voltage is still normal 220 volt.

b. With the actual condition of the pump turn down to 1000 rpm how much water can be drained if water remains to be raised as high as 200 m.

c. How much water can be raised if the amount of water remains as much as 650 liters / minute.

d. What is the power requirement in the actual condition.

A piston–cylinder device initially contains 2 kg water in 1 m3 at 500 kPa. The system then cools down and the volume drops to half and pressure of 300 kPa. At this state, the piston is resting on a set of stops, and the mass of the piston is such that a pressure of 500 kPa is required to move it. (a) Show the process on a P-v, T-v and P-T diagrams with respect to saturation lines and determine, (b) the final temperature, (c) the work done during this process, and (d) the total heat transfer. full step plz

Question 2

a) List and describe the five processes that cause wear at the interface of the tool and chip and the interface of tool and work in machining. What are the two major factors which enhance tool wear mechanisms? Explain in detail.

b) List and describe the three main processes that cause grinding wheel wear. Define Grinding Ratio and explain in detail, the relationship between grinding ratio, surface finish, and wheel speed using a plot.

Question 3

a) In an Electrochemical Machining process, the feedstock is made of an aluminium alloy (Ultimate Tensile Strength = 572 MPa, Tensile Yield Strength = 503 MPa). The desired time to machine a hole (?=10 mm) through a 20 mm-thick part is 2.1 min at a feed rate of 0.18 mm/s. What are:

(i) the efficiency of the process in %, and

(ii) the current requirement in amps to achieve this machining time target?

b) Describe in detail the process of circular sawing with the aid of a freehand sketch. What are the two major mechanisms by which circular sawing is achieved and what materials are commonly used as circular saws of each type?

Question 3

a) In an Electrochemical Machining process, the feedstock is made of an aluminium alloy (Ultimate Tensile Strength = 572 MPa, Tensile Yield Strength = 503 MPa). The desired time to machine a hole (?=10 mm) through a 20 mm-thick part is 2.1 min at a feed rate of 0.18 mm/s. What are:

(i) the efficiency of the process in %, and

(ii) the current requirement in amps to achieve this machining time target?

b) Describe in detail the process of circular sawing with the aid of a freehand sketch. What are the two major mechanisms by which circular sawing is achieved and what materials are commonly used as circular saws of each type?

1)Why we want to choose 1-2 heat exchange
2) Benefits of using many tubes in the heat exchange
3) material use for tube
4)shell tube
5) why we use 1 inch two pass
6) the length of tube we use is 6ft
7)U tube - Coose BEU and AEU
8)tube sheet
9) buffle

Question 4)

a) Explain in some detail the meaning of thermal radiation. Your answer should include the difference between radiation from other forms heat transfer.

b) What is the stefan-Boltzmann law. How does this relate to the heat transfer by radiaion?

themes of gas metal arc welding...
I need by report....
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pleasee give more details about that you can take 5 hour

How can I make calculations and design a toy car running at a speed of 10m/s and which should cover a maximum distance of 30m? The design should consist of springs, gears, shafts, rack, and pinion. Urgent help needed.

Air at 1 atm flowing at a rate of 0.1 kg / s has to be cooled from 400 to 300K in a tube of 10 cm in diameter with a uniform wall temperature of 250 K. Determine the length of the tube.