t\'s manufacturing work Please do all the questions correctly 100%. Thank you lo
ID: 2250383 • Letter: T
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t's manufacturing work Please do all the questions correctly 100%. Thank you lon A - answor all questions (2 points each) The least expensive time to implement changes in a produet s a. The detailed design phase ototype phase c The conceptual phase d. Full production phase 2. Which is statement is FALSE of Jominy tests? a. The results from the test if a b. The metal hardness can be measured by a du c. The resulting hardenability curve hardness d. A metal sample is cooled quickly by will indicate if a material can be successfuly case hardened plots hardness versus distance from the quenched end submerging in water rpm? 3. A 30mm diameter piece of bar lathe has a r stock in a lathe has a surface speed of 200mms What is ts a. 2.1 rpm b. 127.3 rpm c. 13.3 rpm d. Not possible to calculate Which of the following is FALSE with respect to composites? The strength is affected by the ratio of the components used b. a. The orientation of the fibers can impact the final strength Glass fibers d. The matrix is always polymers c. are more expensive than carbon fibers bulk mechanical properties? 5. Which of the following materials has isotropic a. Single crystal diamond b. Fine grained polycrystalline copper c. Single crystal silicon d. A cylindrical ceramic specimen 6. Which of the following materials is expected to undergo the least strain in a uniaxial tension of 1MPa? a. Copper b. Steel c. Silicone rubber d. Aluminum 7. Which of the following processes is NOT part of the manufacture of silicon wafer substrates? a. Crystal growth b. Boule slicing c. Polishing d. Sputtering 8. Which of the following processes can be performed on a lathe a. Boring b. Pocketing c. Broaching d. None of the aboveExplanation / Answer
1) Option = C.
the least expensive phase where we can implement changes in design is the conceptual design phase. This is a primary phase in the design of any component. So if any changes in later stages like detailed design and prototype manufacturing incur a huge cost.
2) Option = A
The Jominy Test data illustrate the effect of alloying and microstructure on the hardenability of steels. Commonly used elements that affect the hardenability of steel are carbon, boron, Chromium, Manganese, Molybdenum, Silicon, and Nickel.
3) Option = B
Surface speed = V = 200 m/sec.
Diameter = D = 30 mm = 15 mm
Surface speed = V = (pi)*D*N / 60
200*60 = 3.14*30*N
N = 200*60/(3.14*30) = 127.3 rpm
4) Option = D.
Matrix materials are not always polymers. A wide variety of metals like Aluminum, titanium alloys are used as matrix materials. Ceramics are also being used as matrix materials.
5) Option = B.
In a single crystal, the physical and mechanical properties often differ with orientation. Polycrystalline materials often display isotropic nature. So fine-grained polycrystalline copper will have isotropic bulk mechanical properties. Ceramic materials are weak in compression, so ceramic do not show isotropic bulk mechanical properties.
6) Option = B
We know the modulus of elasticity E = Stress/ strain.
Consider there is a constant cross-section, so stress developed is the same in all materials.
Strain = (1/E).
Material which has the highest modulus of elasticity undergo least strain.
Steel has got the highest modulus of elasticity among given materials which are 200 Gpa, so it undergoes less strain.
7) Option =D
Sputtering is not a part of a process. Slicing, polishing and crystal growth are the processes which are used.
8) Option= A
Boring can be performed on the lathe. For broaching, we need a special tool and machine. Same is the case for pocketing.
9) Option = A
In shearing operation, the required load is always above the yield strength of the material so that it shears off.
10) Option = C.
Copper is not an alloy. It is an Individual mineral used for an alloying purpose. Brass and bronze are copper alloys and invar is an alloy of Iron and Nickel.
11) Option = C.
Networking of polymers is also known as cross-linking. Cross-linking makes difficult for the molecules to slide one over another compared to linear and branched networks. So it exhibits high stiffness.
12) Option = C.
Elliptical EDM electrodes are more often used for elliptical hole making.
13) Option = C.
The pattern is not a part of final sand casting system . Pattern is removed just before pouring of metal. SO it is not a part of the final sand casting system. Runner, Cope box and core remains in place.
14) Option = D.
A = P(1 + rt)
Where:
300000+45000 = 300000*(1+r*1)
Interest rate = r = 15%
15) Option = D
Murphy's law is a popular adage that states that "things will go wrong in any given situation, if you give them a chance,". Ic engines manufcatures use this to improve their performance.
16) Option = C.
it is said that compounded quarterly.
1 year = 12 months = 4 quartes.
Interest rate = 16%
Effective rate = 16 /4 = 4 %.
17) Option = B
Open die forging cannot produce complex, intricate shapes. Closed die forging does this job.
18) Option = B.
In sintering, the powder particles do not convert into a liquid. Just it initiates boding between compacted powder particles.
19) Option = D
Elastomers cannot be machined by EDM process. Elastomers are mostly polymers so they do not have any electrical conductivity unlike most of the metals. So they cannot be machined using EDM.
20) Option = B.
yes, extrusion is faster than any conventional machining process. Since it involves only pulling from one end of the opening.
Aluminium cannot be used as die material as it is very soft. Tool steel is used as die materials often.
Applied should be less than Fracture strength(FS) and above yield strength in order to obtain plastic deformation. If the applied load is greater than FS, the material simply fractures instead of being pulled.
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