The solidification shrinkage of carbon steel is around
A.0.1 to 0.2 percent
B.0.5 to 1 percent
C.2 to 4 percent
D.8 to 10 percent
Category: Foundry Technology Mcqs
Permeability of sand decreases as
A.permeability increases
B.moisture content increases
C.bonding content increases
D.all of the above
Blow holes in castings are due to
A.high moisture content of the sand
B.low permeability of sand
C.excessive fine grains and gas producing ingredients
D.any of the above
The contraction allowance for pattern depends on
A.composition of the metal
B.method of moulding used
C.pouring temperature
D.all of the above
There is no need for the withdrawal of pattern from the mould in case of
A.wax patterns
B.hollow patterns
C.patterus with core
D.consumable patterns
Which of the following is very powerful carbide former in cast iron?
A.Silicon
B.Vanadium
C.Chromium
D.Nickel
Which of the following holes appear on the surface of the casting when it is machined?
A.Blow holes
B.Pin holes
C.Gas holes
D.Slag holes
In case of carbondioxide moulding, the binder used is generally
A.sodium silicate
B.china clay
C.coal dust
D.graphite
Which of the following statement about gates is incorrect?
A.he size of gate depends upon the rate of solidification
B.A small gate is used for castings which solidify rapidly
C.More than one gate may be used to feed a fast freezing casting
D.A gate should not have sharp edges
The residual stresses in casting occur due to
A.sand particles being taken into molten metal while pouring
B.the insufficient gate size
C.the differential solidification rate of thin and thick sections of casting
D.none of the above
