The purpose of tempering Marensite is (a) to reduce toughness (b) to reduce duct

Question

The purpose of tempering Marensite is (a) to reduce toughness (b) to reduce ductility (c) to avoid crack formation (d) to induce residual stress 2. The Heat treatment process which is done above the critical temperatures A_3 and A_cm is (a) Normalizing (b) Tempering (c) Process annealing (d) Recrystallization annealing 3. Which of the following invariant reaction does not occur in Irce-carbon phase diagram (a) Eutectic (b) Eutectoide (c) Peritectic (d) Peritectoid 5. The process of making Ceramic products by applying head and pressure is called a. Slip casting b. Hydroplasting c. Comentation d. Simtering 6. the polymer which is engineering application is a. polypropylene b. PVC c. PKEEK d. polyethy kne 7. Name the polymers shown below

Explanation / Answer

1.

c) To avoid crack formation.

2.

a) Normalizing

3.

d) Peritectoid

4.

Height of pyramid, H = (a2 - (a2/3)2)0.5 = a/3

Distance between planes = a3 - 2H = a3 - 2a/3 = a/3

b) a/3

5.

d) Sintering

6. PVC is a common, strong but lightweight plastic used in construction.

b) PVC

7.

(i) Polytetrafluoroethylene (PTFE) polymer (Teflon and Fluon)

(ii) Polyphenols

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