Mechanical Engineer Portal

Mechanical Engineers Portal

Monday, June 26, 2017

Gate Manufacturing Engineering Previous Year Questions [1997-2017]

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

1. Riser is designed so as to [ME: 1987]
freeze after the casting freezes
freezing before the casting freezes
freeze at the same as the casting
minimize the time of pouring
2. The contraction allowance provided on the pattern and core boxes compensates for the following type of contraction [ME: 1988]
liquid contraction
solidification contraction
solid contraction
All the above three types of contractions
3. Chills are used in moulds to [ME: 1989]
achieve directional solidification
reduce possibility of below holes
reduce the freeing time
smoothen the metal for reducing spatter
4. Increase in water content in moulding sand causes [ME:1989]
flowability to go through a maxima
permeability to go through a maxima
compressive strength to go through a maxima
strength to go through maxima
5. The pressure at the in-gate will be maximum will the gating system [ME: 1990]
4:8:3
1:3:3
1:2:4
1:2:1
6. When there is no room temp change, the total shrinkage allowance on a pattern is independent of [ME: 1991]
pouring temp of the liquid metal
freezing temp of the liquid metal
the component size
coefficient of thermal contraction of solidified metal
7. Converging passage is used for feeding the liquid molten metal into the mould to [ME: 1992]
increase the rate of feeding
quickly break off the protruding portion of the casting
decrease wastage of cast metal
avoid aspiration of air
8. In green sand moulding process, uniform ramming leads to [ME: 1992]
less chance of gas porosity
uniform flow of molten into the mould
greater dimensional stability of the casting
less sane expansion type of casting defect
9. Centrifugally casted products have [ME: 1993]
large grain structure with high porosity
fine grain structure with high density
fine grain structure with low density
segregation of slug toward the outer skin of the casting
10. Light impurities in the molten metal are prevented from reaching the mould cavity [ME: 1996]
Strainer
Button well
Skim bob
All of the above
11. Which of the following materials requires the largest shrinkage allowance, while making a pattern for casting [ME: 1999]
Aluminium
Brass
Cast iron
Plain carbon steel
12. Disposable patterns are made of [ME: 2000]
Wood
Rubber
Metal
Polystyrene
13. Shrinkage allowance on pattern is provided to compensate for shrinkage when [ME: 2001]
the temp of liquid metal drops from pouring to freezing temp
the metal changes from liquid to solid state at freezing temp
the temp of solid phase drops from freezing to room temp
the temp of metal drops from pouring to room temp
14. In centrifugal casting, the lighter impurities are [ME: 2002]
uniformly distributed
forced towards the outer surface
trapped near the mean radius of the casting
collected at the centre of the casting
15. The primary purpose of sprue in the casting mould is to [ME: 2002]
feed the casting at the rate consistent with the rate of solidification
Act as a reservoir for molten metal
feed molten metal from the pouring basin to the gate
help feed the casting until all solidification takes place
16. Hardness of green sand mould increases with [ME: 2003]
increase in moisture content beyond 6 percent
increase in permeability
decrease in permeability
increase in both moisture content and permeability
17. Misrun is a casting defect which occurs due to [ME: 2004]
very high pouring temperature of the metal
insufficient fluidity of the molten metal
absorption of gases by the liquid metal
improper alignment of the mould flasks
18. An expendable pattern is used in [ME: 2006]
Slush casting
Squeeze casting
Centrifugal casting
Investment casting
19. Which of the following engineering materials is the most suitable candidate for hot chamber die casting [ME: 2007]
Low carbon steel
Titanium
Copper
Tin
20. Two stream of liquid metal which are not hot enough to fuse properly result into a casting defect known as [ME: 2009]
Cold Shut
Swell
Sand wash
Scab
Score =
Correct answers:

No comments:

Post a Comment

themechanicalguru.com. Powered by Blogger.