question 6. (1.5 Points) Which of the following describes the to higher length s

Question

question 6. (1.5 Points) Which of the following describes the to higher length scales? structure of materials from lower length-scales 1. Microstructure, atom, lattice. 2. Lattice, atom, amorphous A Lattice, nano-structure, molecule 4. Atom, molecule, grain. Question 7. (1.5 Points) The purpose of a riser when casting is to 1. provide extra weight. 2. promote inoculation. 3. degas, provide extra molten metal, and compensate for shrinkage. 4. none of the above. n 8 (15 Points) Elongation in the direction of loading results in an opposite change in dimension perpendicular to the loading. The is most closely associated with that phenomena 1, elastic modulus 2. strain hardening 3. slip system 4. Poisson ratio Question 9. (1.5 Points) Consider the command N15 G01 GS1 X1.30 Y3.50 21.50 F1500- which part of the command determines the coordinates of the tool? 1. N15 2. GoI G81 3. X1.30 Y3.50 21.50 4. F1500 Question 10. (4 Points) A 125 in diameter bar is subjected to a load of 13.0kN. Compute the engineering stress in the bar in MPa. 1. 88.54ksi 2. 164.2 MP 3. 16.42 MPa 4. 88.54 MPa Question 11. (1.5 Points) Generally speaking. are produced by the addition of chromium as an alloying element to carbon steel. 1. dual phase steels 2. stainless steels 3. advanced high strength steels 4. none of the above

Explanation / Answer

Question 6-

Among the given option option 3 is correct because nanostructure are transition between lattice and molecule.

Question 7)

When molten metal cools down it shrink, so to compensate the shrinkage extra molten metal is provided by riser. Hence option 3.

Question 8)

Poisson's ratio is ratio of lateral strain to longitudinal strain. Hence option 4.

Question 9)

N15 is the serial number.

G01 G81 is motion related command.

X1 30 Y3 50 Z1 50 is the coordinates of tool.

F1500 is feed.

Hence option 3.

Question 10)

Engineering stress = Load/ area

Load= 13 KN= 13000 N.

Area =?(D2)/4, D=1.25 in = 31.75 mm

So area = ?× (31.75)2/4= 791.73 mm2.

Engineering stress= 13000/791.73 = 16.42 N/mm2 or 16.42 Mpa.

So option 3.

Question 11.

Chromium when added to steel makes it corrosion resistant, and it is called stainless steel.

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