218. For steel castings, the following type of sand is better
A.Fine grain
B.Coarser grain
C.Medium grain
D.All are equally good
219. As the size of castings increases, it is often better to use increasingly
A.Fine grain
B.Medium grain
C.Coarse grain
D.Any one of the above
220. The purpose of riser is to
A.Feed the casting at a rate consistent with the rate of solidification
B.Act as a reservoir for molten metal
C.Help feed the casting until all solidification takes place
D.Feed molten metal from pouring basin to gate
221. Slick is
A.A round sieve
B.A long, flat metal plate fitted with an offset handle
C.Used to make or repair corners in a mould
D.Used to scoop sand deep in mould
222. Hot tear refers to
A.Casting defect
B.Process of fabrication
C.Process of heat treatment
D.Weathering of non-ferrous materials
223. Slick in a foundry shop is used to
A.Make and repair corners in a mould
B.Thoroughly mix up moulding sand
C.Make venting holes in the mould
D.Prepare gates
224. True centrifugal casting
A.Is used to ensure purity and density at extremities of a casting
B.Is used to cast symmetrical objects
C.Is used to obtain high density and pure castings
D.Uses a heavy cast iron mould to act as chill
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