Q. Arrange the following processes in INCREASING magnitude of surface roughness of the casting.
P. Investment casting
Q. Permanent mould casting
R. Pressure die casting
S. Sand casting
(A) R < S < Q < P
(B) P < S < Q < R
(C) R < P < Q < S
(D) Q < P < R < S
Ans: R < P < Q < S
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