Bissoy.com
Doctors Medicines MCQs Q&A

Which of the following is the main drawback of using the shell mould casting method?

Which of the following is the main drawback of using the shell mould casting method? Correct Answer Limited size of casting parts

In shell moulding process, a dump box is used in which a heated metallic pattern is inserted with the sufficient amount of coating sand, then the dump box is rotated by which the pattern has adhered to the coating sand and then the pattern is extracted out by melting. In this process, due to limited size of the dump box, only limited size of casting parts can be produced.

Related Questions

At the mould exit of a continuous caster, the metal consisting of a solidified shell with a liquid metal core exits at the rate of 35 kg S-1. Given that the latent heat of fusion is 3 × 105 J kg-1 and the total rate of heat removal by the mould is 4.2 × 106 W, the mass fraction of solid at the mould exit is . . . . . . . .
Assume that both while solid and liquid remain at the melting point, they are in the mould.
The casting processes that require expendable moulds are
P. Investment casting
Q. Low pressure casting
R. Shell moulding
S. Slush casting
In permanent mould casting, the mould is pre-heated to its operating temperature before the actual use of mould.
Over-curing or under-curing of the shell mould, leads to the generation of sophisticated problems in the shell mould.
A 250 mm by 250 mm ingot casting, 1.5 m high and at 1225 K temperature, is stripped from its mold. The casting is made to stand on end on the floor of a large foundry whose wall, floor and roof can be assumed to be at 300 K temperature. Make calculation for the rate of radiant heat interchange between the casting and the room. The casting material has an emissivity of 0.85
When a pattern is to be withdrawn from the mould, it is first shaken, by striking over it from side to side, so that its surface may be free of the adjoining sand wall of the mould. That causes the size of the mould cavity increases a little and a negative allowance is to be provided in the pattern to compensate the same, is known as:
Continuous passing of Co2 through the mould can decrease the strength of mould and results in a weak mould.
The occurrence of casting defect ‘rat tail’ is possible because of 1. Soft ramming of sand 2. The continuous large flat surface on the mould 3. The excessive hardness of the mould Which of the above reasons is correct?
In permanent mould casting, the temperature at which the mould is used does not depend on _____
In plaster mould casting the mould is made from?