Chemical dipping of die casted parts is usually done for
A.flash removal
B.dimensional stability
C.corrosion protection
D.none of the above
Category: Foundry Technology Mcqs
The sand used for sprinkling on the patterns/parting surface of the mould is known as
A.Floor sand
B.Parting sand
C.Dry-sand
Moulding sand properties that depend upon size and shape of grains and bonding material are
A.permeability and plasticity
B.plasticity and adhesiveness
C.adhesiveness and cohesiveness
D.cohesiveness and permeability
Shell patterns are often used for
A.pipe work
B.bends
C.drainage fittings
D.all of the above
As compared to green sand in shell moulding cooling rate of cast metal is slow. Hence as compared to green sand castings, shell moulded castings will have
A.larger grain size
B.smaller grain size
Metal moulds are used in
A.green sand moulding
B.dry sand moulding
C.loam moulding
D.die casting process
The design of gate should be such as to
A.avoid erosion of cores and mould cavity
B.prevent scum, slag and eroded sand particles from entering the mould cavity
C.minimize turbulence and dross formation
D.all of the above
Aluminium is not a very good material for die casting because
A.it is very light but strong
B.its melting point is high, it erodes the die surface and tends to react chemically with die
C.it cools much slowly
D.none of the above
For grey cast iron the pouring temperature is
A.1510 to 1532?C
B.1455 to 1495?C
C.1400 to 1465?C
D.1250 to 1290?C
Which of the following is used as protective admixture in moulding sand for magnesium castings?
A.Boric acid
B.Sublimed sulphur
C.Fluoric additives
D.Any of the above
