F 06000ME365122001 Pages: 3

Reg No.: Name:
APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY
Fifth Semester B.Tech Degree Regular and Supplementary Examination December 2020

Course Code: ME365
Course Name: ADVANCED METAL CASTING
Max. Marks: 100 Duration: 3 Hours
PARTA
Answer any three full questions, each carries 10 marks. Marks
1 a) Explain the following types of sand used in casting process. (3)

(1) Green sand (2) Loam sand (3) Parting sand
b) With neat sketch explain the following sand testing techniques (3)
(1) Moisture content test (2) Grain fineness test
c) Explain the following properties of moulding sand. (4)
(1) Refractoriness (2) Dry strength (3) Hotstrength (4) Flow ability
2 2) Explain the term “mould wall movement”. List any 4 causes of mould wall (3)
movement.
b) List any 4 advantages and disadvantages of sand casting process. (4)
c) Write short notes on mould surface coatings. List any 4 functions of mould (3)
surface coatings.
3 a) With neat sketch explain the basic elements in a Gating system. (4)
b) Ina gating system the mould dimensions are 50X25X15 cm, cross sections of (4)
the gate are ऽलः and height of the liquid metal above the gate is 15 cm.Find
the time required to fill the cavity by using top and bottom gating.
c) List any 4 functions of risers. (2)
4 ஐ What are the uses of chills, insulators and exothermic compounds? (3)
b) A cylindrical riser must be designed for a sand casting mould. The casting itself (4)
is a steel rectangular plate with dimensions 7.5 cm X 12.5 cm X 2 cm.
Previous observations have indicated that the solidification time for the casting
is 1.6 Minute. The cylinder for the riser will have a diameter to height ratio as
1.Determine the dimensions of the riser so that its solidification time is 2
minute.

c) Explain the hydraulic principles involved in Gating system design. (3)

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