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Previ revio ous Years Gate Questio stion ns on Cas Casting ing 2007-20 -2013 - Engine ineerin ring Tutoria rials
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Previous Years Gate Questions on Casting 2007-2013 July 24, 2015 By Amit Thakur
Solved Gate Questions on Casting Question 1. A 200 mm long down sprue has an area of cross—section of 650 where the pouring basin meets the down sprue (i.e. at the beginning of the down sprue). A constant head of molten metal is maintained by the pouring basin. The molten metal flow rate is 6.5 . Considering the end of the down sprue to be open to atmosphere and an acceleration due to gravity of of the down sprue in
, the area
at its end (avoiding aspiration effect) should be
(A) 650.0
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Previous Years Gate Questions on Casting 2007-2013 - Engineering Tutorials
At down,
Question 2. Volume of a cube of side ‘l’ and volume of a sphere of radius ‘r’ are equal. Both the cube and the sphere are solid and of same material. They are big cast. The ratio of the solidification time of the cube to the same of the sphere is
(A)
(B) (C)
(D) GATE-ME-2007
Hint
Hint 2. (Ans D)
Solidification time
,
Required ratio
Question 3. Which of the following engineering materials is the most suitable material for the chamber die casting? (A) Low carbon steel (B) Titanium (C) Copper (D) Tin GATE-ME-2007
Hint
Hint 3. (Ans B)
For hot chamber die casting, titanium is used.
Question 4. While cooling, a cubical casting of side 40 mm undergoes 3%, 4% and 5% volume shrinkage during the liquid state, phase transition and solid state, respectively. The volume of the metal compensated from the riser is (A) 2 % (B) 7 % (C) 8 % (D) 9% GATE-ME-2008
Previous Years Gate Questions on Casting 2007-2013 - Engineering Tutorials
Hint 4. (Ans B)
The riser can compensate for volume shrinkage only in the liquid stage and transition stage and not in the solid state. Hence volume of metal that needs to be compensated from the riser =3+4=7%
Question 5. Match the items in Column I and Column II. Column I P. Metallic Chills Q. Metallic Chaplets R. Riser S. Exothermic Padding
Column II 1. Support for the core 2. Reservoir for the core 3. Control cooling of critical sections 4. Progressive solidification
Question 6. Two streams of liquid metal which are not hot enough to fuse properly result into a casting defect known as (A) Cold shut (B) Swell (C)Sand wash (D) Scab GATE-ME-2009
Hint
Hint 6. (Ans A)
Question 7. In gating system, the ratio 1:2:4 reprsents (A) Sprue base area : runner area : ingate area (B) Pouring basin area : ingate area : runner area (C) Pouring basin area : ingate area : Casting area (D) Runner area : ingate area : Casting area GATE-ME-2010
Hint
Hint 7. (Ans A)
Question 8. A cubic casting of 50 mm side undergoes volumetric solidification shrinkage and volumetric solid contraction of 4% and 6% respectively. No riser is used. Assumed uniform cooling in all directions. The side of the cube after solidification and contraction is (A) 48.32 mm (B) 49.90 mm (C) 49.94 mm (D) 49.96 mm GATE-ME-2011
Previous Years Gate Questions on Casting 2007-2013 - Engineering Tutorials
Volume of cube after solidification and contraction
Question 9. Green sand mould indicates that (A) Polymeric mould has been cured (B) Mould has been totally dried (C) Mould is green in colour (D) Mould contains moisture GATE-ME-2011
Hint
Hint 9. (Ans D)
Green sand mould indicates that mould is not baked or dried. i.e., it contains moisture.
Question 10. A cube shaped casting solidifies in 5 min. The solidification time in min for a cube of the same material, which is 8 times heavier than the original casting, will be (A) 10 (B) 20 (C) 24 (D) 40 GATE-ME-2013
Hint
Hint 10. (Ans B)
Weight is 8 times heavier
Cube of side ‘a’ http://engineering.myindialist.com/2015/previous-years-gate-questions-on-casting-2007-2013/#.V9Ynk1t97IU
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Previous Years Gate Questions on Casting 2007-2013 - Engineering Tutorials
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