# The primary function of a riser is to

1.  feed molten metal to casting as it solidifies

2.   prevent atmospheric air form contaminating the metal in the mold

3.  allow the gases to easily escape from mold cavity

4.  allow molten metal to rise above the mod cavity

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feed molten metal to casting as it solidifies

Explanation :
No Explanation available for this question

# Chaplets are placed between molds in order to

1.  promote directional solidification

2.  help alloying the metal

3.  facilitate easy removal of core from casting

4.  prevent core movement due to buoyancy

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prevent core movement due to buoyancy

Explanation :
No Explanation available for this question

# A cube shaped casting solidifies in 5min. The solidification time in min for a cube of the same material, which is 8times heavier than the original casting, will be

1.  10

2.  20

3.  24

4.  40

4

20

Explanation :
No Explanation available for this question

# A cube shaped casting solidifies in 5min. The solidification time in min for a cube of the same material, which is 8times heavier than the original casting, will be

1.  10

2.  20

3.  24

4.  40

4

20

Explanation :
No Explanation available for this question

# Two cubical casting of the same metal and sizes of 2cm side and 4cm side are moulded in green sand, the expected time of solidification of larger casting will be

1.  16 min

2.  2 √8 min

3.  8 min

4.  4 min

4

8 min

Explanation :
No Explanation available for this question

# Two cubical casting of the same metal and sizes of 2cm side and 4cm side are moulded in green sand, the expected time of solidification of larger casting will be

1.  16 min

2.  2 √8 min

3.  8 min

4.  4 min

4

8 min

Explanation :
No Explanation available for this question

# A cubic casting of 50mm side undergoes volumetric solidification shrinkage and volumetric solid contraction of 4% and 6% respectively. No raiser is used. Assume uniform cooling in all direction. The side of cube after solidification and contraction

1.  48.32mm

2.  49.90mm

3.  49.94mm

4.  49.96mm

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48.32mm

Explanation :
No Explanation available for this question

# Shrinkage allowance on pattern is provided to compensate for shrinkage when

1.  the temp of liquid metal drops from pouring to freezing temp

2.  the metal changes from liquid to solid state at freezing temp

3.  the temp of solid phase drops from freezing to room temp

4.   the temp of metal drops from pouring to room temp

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the temp of solid phase drops from freezing to room temp

Explanation :
No Explanation available for this question

# When there is no room temp change, the total shrinkage allowance on a pattern is INDEPENDENT OF

1.  pouring temp of the liquid metal

2.  freezing temp of the liquid metal

3.  the component size

4.  Coefficient of thermal contraction of solidified metal

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pouring temp of the liquid metal

Explanation :
No Explanation available for this question

1.  1.14

2.  0.87

3.  1.31

4.  0.76

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