Foundry Metallurgy - Study Mode
[#56] The riser is designed such that the melt in the riser solidifies
Correct Answer
(C) After casting solidifies
[#57] What is the solidification temperature of malleable cast iron?
Correct Answer
(A) 1129° - 1398°C
[#58] 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
Correct Answer
(A) P-3, Q-2, R-4, S-1
[#59] When the cooling rate during solidification process is very slow then the growth of nuclei takes place by
Correct Answer
(A) Smooth interfacial growth
[#60] 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
Correct Answer
(B) P-4, Q-1, R-2, S-3