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Wednesday, June 28, 2017

GATE Manufacturing Engineering Previous Year Questions: Metal Casting Set-1

Gate Manufacturing Engineering Previous Year Questions [1997-2017]

Metal Casting: SET-1

1. Riser is designed so as to [ME: 1987]
A. freeze after the casting freezes
B. freezing before the casting freezes
C. freeze at the same as the casting
D. minimize the time of pouring
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2. The contraction allowance provided on the pattern and core boxes compensates for the following type of contraction [ME: 1988]
A. liquid contraction
B. solidification contraction
C. solid contraction
D. All the above three types of contractions
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3. Chills are used in moulds to [ME: 1989]
A. achieve directional solidification
B. reduce possibility of below holes
C. reduce the freeing time
D. smoothen the metal for reducing spatter
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4. Increase in water content in moulding sand causes [ME:1989]
A. flowability to go through a maxima
B. permeability to go through a maxima
C. compressive strength to go through a maxima
D. strength to go through maxima
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5. The pressure at the in-gate will be maximum will the gating system [ME: 1990]
A. 4:8:3
B. 1:3:3
C. 1:2:4
D. 1:2:1
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6. When there is no room temp change, the total shrinkage allowance on a pattern is independent of [ME: 1991]
A. pouring temp of the liquid metal
B. freezing temp of the liquid metal
C. the component size
D. coefficient of thermal contraction of solidified metal
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7. Converging passage is used for feeding the liquid molten metal into the mould to [ME: 1992]
A. increase the rate of feeding
B. quickly break off the protruding portion of the casting
C. decrease wastage of cast metal
D. avoid aspiration of air
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8. In green sand moulding process, uniform ramming leads to [ME: 1992]
A. less chance of gas porosity
B. uniform flow of molten into the mould
C. greater dimensional stability of the casting
D. less sane expansion type of casting defect
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9. Centrifugally casted products have [ME: 1993]
A. large grain structure with high porosity
B. fine grain structure with high density
C. fine grain structure with low density
D. segregation of slug toward the outer skin of the casting
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10. Light impurities in the molten metal are prevented from reaching the mould cavity [ME: 1996]
A. Strainer
B. Button well
C. Skim bob
D. All of the above
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