Bissoy.com
Doctors Medicines MCQs Q&A

Co2 moulding is mainly used for the increase in strength and hardness of the moulds and cores.

Co2 moulding is mainly used for the increase in strength and hardness of the moulds and cores. Correct Answer True

Mould is prepared by adding sodium silicate binder. Co2 gas is supplied to the mould for sufficient time. It reacts with sodium silicate and produces silica gel which has better bonding properties. Due to this strength and hardness of the large sized moulds and cores can be increased.

Related Questions

Steel moulds used in the process of moulding for the manufacturing of bricks are less durable than the brick moulds.
Co2 moulding is a kind of sand moulding, but it is not economical than the green sand moulding.
For the removal of cores from the moulding box, caustic bath can be used which is very fast in processing the large and complex cores.
Dry sand moulds have high strength than the green sand moulds to form large castings.
Which of the following tests are microhardness tests? P. Brinell Hardness Q. Rockwell Hardness R. Knoop Hardness S. Vickers Hardness
What are the temperature and pressure conditions in compression moulding technique in the moulding of phenolic moulding powder?
Which one of the following sets is incorrect to show the inter-relationships among price elasticity coefficient, change in price and change in total revenue ? Price elasticity coefficient Change in price Change in Total Revenue 1) Zero Increase Decrease Increase Decrease (2) Less than 1 Increase Decrease Decrease Increase (3) Equal to 1 Increase Decrease No change No change (4) More than 1 Increase Decrease Decrease Increase  
In permanent mould casting method, metallic cores are mainly used instead of sand cores.
Statement (I): Both sand and metal moulds can be used for centrifugal casting. Statement (II): In this process, sand moulds are recommended when chilling tendency is to be prevented. 
In the mechanized foundry, a roller conveyor is used for the transportation of moulds, on which moulds are transferred by rolling.