(a) What is the difference between turning and milling? What is the difference between peripheral milling (slab milling) and face milling? (b) What are the main parameters in describing the profile of a thread? How to cut threads on a lathe? (c) Describe the differences between electrochemical machining (ECM) and elctrodischarge machining (EDM).
In: Mechanical Engineering
(a) Describe the process steps in sand casting? Compare to die casting, what are some major advantages and disadvantages of sand casting?
(b) Describe the process steps in investment casting?
(c) Describe the process of hot-chamber and cold-chamber die casting. What are the most attractive features for each process?
In: Mechanical Engineering
How linear Velocity and acceleration, and angular velocity and acceleration depends upon the engine rotation angle?
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(a) Describe the steps in conventional powder metallurgy shaping process. What are the advantages and disadvantages of this process? (b) How does the fabrication of thermoplastic polymer differ from the processing of thermosetting polymer? (c) What is the heat affected zone in welding? Why preheating is sometime performed in welding?
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(a) Bulk deformation processes include rolling, forging, extrusion and drawing. Describe each process. (b) What is the main difference between hot working and cold working? List at least two advantages and two disadvantages of cold working. (c) What is the neutral axis and what is springback in bending process?
In: Mechanical Engineering
In: Mechanical Engineering
Hyrdaulic jack for lifting articulator trailer conceptual design sketch. NOTE: THE OPERATOR MUST JACK FROM OUTSIDE THE TRAILER
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What is a patch, or micro strip, antenna and how does it work?
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how to find surface temperature of the flat plate which is subjected to air flow from one side and constant temperature on the other side using Ansys fluent ?
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The moon has a very low average atmospheric pressure of 3x10-15 bar (1 bar = 100,000 N/ m 2) and a gravity of 1.62 m/s². Assuming that the density of oil is 0.93 g/cm3, calculate the reading on a manometer of: (a) The atmospheric pressure of the moon in meters of oil (head) (b) The atmospheric pressure of the moon in meters of mercury (head), assuming mercury has a relative density of 13.6.
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this is a FEM question.
1a. Describe the procedure for calculating the maximum stress
for a quick heating of a machine.
1b. Suppose we have a vibrating machine component and that we know
the size and frequency of the interference. Explain how we can
calculate the maximum stress in the vibrating machine
component.
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3 Question 3: In an air standard Diesel cycle with compression ratio 14, the conditions of the air at the start of compression stroke are 1 bar and 300 K. After addition of heat at constant pressure, the temperature rises to 2774 K. Determine: a) the thermal efficiency of the cycle b) the net work done per kg of air and the c) mean effective pressure
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A two-cylinder, four-stroke gas engine has a bore of 380 mm and a stroke of 585 mm. At 240 rev/min the torque developed is 11.86 kNm. If the engine is supplied with a mixture of gas and air in the proportion of 1 to 7 by volume. The estimated volumetric efficiency is 85% and the Qnet,p of the gas is 38.6 MJ/m3. Calculate the brake thermal efficiency of the engine.
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Assume the water for a boiler is preheated using flue gases from the boiler stack. The flue gases are available at a rate of 0.25 kg/s at 150°C, with a specific heat of 1000 J/kg · K. The water entering the exchanger at 15°C at the rate of 0.05 kg/s is to be heated to 90°C. The heat exchanger is to be of the type with one shell pass and four tube passes. The water flows inside the tubes, which are made of copper (2.5 cm ID, 3.0 cm OD). The heat transfer coefficient on the gas side is 115 W/m2 · K, while the heat transfer coefficient on the water side is 1150 W/m2 · K. A scale on the water side and gas side offer an additional total thermal resistance of 0.000176 m2 · K/W. a. Determine the overall heat transfer coefficient based on the outer tube diameter. b. Determine the appropriate mean temperature difference for the heat exchanger. c. Estimate the required total tube length. d. Calculate the percent over surface design and the cleanliness factor.
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Describe all the steps necessary to determine the Miller indices for a given plane. Use a sketch of an example to demonstrate the process. Show all possible steps and be specific and complete
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