CLASS TEST-3 CASTING AND SOLIDIFICATION Full Mark:30 Time: 50 minutes INSTRUCTIONS 1. 2. 3. 4. 5. Marking will be based on originality, your own analysis Answer from google will not be marked If two person answers are same, both will get ZERO. This is the test of originality (originated from you) and analytical ability Plagiarism is considered as academic offence Answer should be very brief and to the point SECTION A: Short answer type questions [ 10x2=20] 1. “Most of the metallic glasses which have been identified to date require rapid solidification processing” . What do you mean by metallic glass? Why rapid solidification is required for its formation? Ans; Amorphous metal.. To prevent crystallization 2. “Will it be possible to die cast gray cast iron”? Analyze May be . But die design 3. “Permanent mould casting is different from die casting”. Explain the statement Application of pressure 4. “Die cast product contain less gas porosity as compared to sand cast product”. Is it true? Analyze May be pressure 5. “ Zinc and its alloys are considered as most die-castable” . Is it correct. Analyze Low melting temp. fludidity 6. Will you able to prevent air entrapment/entrainment and gas porosity in die casting as well as squeeze casting? Analyze May be by altering plunger speed 7. Why squeeze casting may be applicable to cast Metal Matrix Composite? Pressure, Viscosity, distribution 8. Why many critical and value-added components in aerospace and other key industries are manufactured by the investment casting process? Dimensionlal tolerence 9. What is the difference between true centrifugal casting and semi-centrifugal casting? Explain the principle for design of centrifugal casting machine? 10. What way the application of thixocasting is different from Rheo-casting? Semisolid/From L to L-S, Reverse SECTION B; PROBLEMS 1. Design a suitable feeding and gating systems including riser for the following aluminium plate. [5] Dimension: Length 200 cm, width =100 cm, thickness: last two digits of your roll no. e.g 17MT30001 means thickness 1 cm. Given: density of Al =2.7 gm/cc, pouring time: 20 minutes. Sprue height = 10 cm, Assume any other value if requires. 2. What is the purpose of Chill in sand casting process? How will you able to design and place chill during the process? [3]. 3. ABC Ltd has been facing problem of gas porosity during fabrication of tube of length 600 cm. using true centrifugal casting process. Suggest suitable measure to control the same.[2] Gas ?
