In melting of aluminium, the dross consists of
A.oxides of aluminium, magnesium etc.
B.sand and dust
C.lighter material
D.none of the above
Category: Foundry Technology Mcqs
The burnt on sand causes difficulty in
A.machining of castings
B.removal of castings from moulds
C.separation of sand and castings after pouring
D.all of the above
Local stress relief treatments are generally given to
A.non-ferrous castings
B.small castings
C.too large castings
D.all castings
Which parameter can be used for the measurement of melt in a foundry?
A.Thermo couple pyrometer
B.Optical pyrometer
C.Radiation pyrometer
D.none of the above
Oil fired furnaces are generally used for the melting of
A.cast steel
B.alloy steel
C.cast iron
D.non-ferrous metals
The order of dimensional accuracy in die casting is nearly
A.0.004 percent
B.0.04 percent
C.0.4 percent
D.4 percent
A slick is mainly used for
A.making openings in mould
B.providing openings in the mould
C.repairing and finishing of mould
D.removing pattern from the mould
Pure iron melts at 1500?C. Presence of carbon
A.reduces the melting point
B.increases the melting point
C.does not change the melting point
The melting unit is an integral part of
A.the cold chamber diecastings machine
B.the hot chamber die casting machine
C.both (A) and (B) above
Which of the following is the anti-penetration material introduced in the moulding sand?
A.Coad dust
B.Powdered quartz
C.Black oil
D.all of the above
