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Wednesday, June 28, 2017

GATE Manufacturing Engineering Previous Year Questions: Metal Casting Set-4

Gate Manufacturing Engineering Previous Year Questions [1997-2017]

Metal Casting: SET-4

31. Ceramics is used in making the moulds for [PI: 1991]
A. investment casting
B. die casting
C. shell mould casting
D. centrifugal casting

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32. The primary function of a riser is to [PI: 1992]
A. feed molten metal to casting as it solidifies
B. prevent atmospheric air from contaminating the metal in the mould
C. allow gases to easily escape from mould cavity
D. allow molten metal to rise above the mould cavity

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33. Chaplets are placed between mould in order to [PI: 1992]
A. promote directional solidification
B. facilitate easy removal of core from casting
C. help alloying the metal
D. prevent core movement due to buoyancy

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34. Increase in carbon content in plain carbon steels raise its [PI: 1992]
A. ductility and UTS
B. tensile strength and malleability
C. tensile strength and hardness
D. ductility and melting temperature

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35. According to Chvorinove's rule, the solidification time of casting is proportional to(Volume/surface area)^n, where 'n' equals to [PI: 1994]
A. 0.5
B. 1
C. 2
D. 4

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36. Which one of the following is not a property of a sand mould [PI: 2003]
A. Permeability
B. Collapsibility
C. Strength
D. Fluidity

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37. Chaplets are placed between mould and core surfaces in order to [PI: 2003]
A. reduce directional solidification
B. help local alloying of molten metal
C. help easy removal of core from casting
D. prevent core movement due to buoyancy

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38. Wood flour is added to core sand to improve [PI: 2004]
A. collapsibility of core
B. dry strength of core
C. shear strength of core
D. tolerance on casting

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39. An expandable pattern is used in [PI: 2005]
A. slush casting
B. squeeze casting
C. centrifugal casting
D. investment casting

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40. Cold shut defect in casting due to [PI: 2006]
A. sand sliding from the cope surface
B. internal voids or surface depressed due to excessive gas trapped
C. discontinuity resulting from hundred contraction
D. two streams of material that are too cold to fuse properly

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