22. Loam sand contains . . . . . . . . of moisture
23. The riser is designed such that the melt in the riser solidifies
24. What is the solidification temperature of malleable cast iron?
25. Match the defect with appropriate cause.
List-I
List-II
P. Hot tear
1. Inadequate riser
Q. Porosity
2. Loosely rammed sand mould
R. Sand inclusions
3. Mould restraint
S. Shrinkage cavity
4. Gas entrapment
List-I | List-II |
P. Hot tear | 1. Inadequate riser |
Q. Porosity | 2. Loosely rammed sand mould |
R. Sand inclusions | 3. Mould restraint |
S. Shrinkage cavity | 4. Gas entrapment |
26. When the cooling rate during solidification process is very slow then the growth of nuclei takes place by
27. Match the features observed in castings listed in Group I with the most appropriate reasons listed in Group II.
Group I
Group II
P. Macrosegregation
1. Inoculation
Q. Fine grained structure
2. Gas evolution and shrinkage
R. Porosity
3. Temperature gradients and supercooling
S. dendrites
4. Density difference and convection currents
Group I | Group II |
P. Macrosegregation | 1. Inoculation |
Q. Fine grained structure | 2. Gas evolution and shrinkage |
R. Porosity | 3. Temperature gradients and supercooling |
S. dendrites | 4. Density difference and convection currents |
28. Casting alloys with a large freezing range tend to result in
P. shrinkage cavity
Q. distributed shrinkage porosity
R. liquid metal with poorer fluidity
S. liquid metal with superior fluidity
P. shrinkage cavity
Q. distributed shrinkage porosity
R. liquid metal with poorer fluidity
S. liquid metal with superior fluidity