Foundry Metallurgy - Study Mode
[#26] Riser is not required for the casting of
Correct Answer
(A) grey cast iron
[#27] Assertion 'a' : During casting of aluminium, grain refinement can be achieved by addition of certain alloying elements. Reason 'r' : The addition of the alloying elements may result in the formation of deoxidation products or intermetallic compounds which may act as nucleation sites for grain refinement.
Correct Answer
(A) Both 'a' and 'r' are true, but 'r' is not the reason for 'a'
[#28] In foundary practice, the fluidity of an alloy does not increase with increasing
Correct Answer
(B) channel size
[#29] Fly wheels, track wheels and gears can be produced by
Correct Answer
(B) semi centrifugal casting
[#30] In a casting, cold shut defect is caused by
Correct Answer
(A) low pouring temperature