Continuous passing of Co2 through the mould can decrease the strength of mould and results in a weak mould.

Related MCQs

• How much time (in a minute) is usually required for the passing of Co2 through the mould?
• It is very safe to use Co2 in Co2 moulding, so it eliminates the use of any shielding apparatus.
• Moisture from the mould can be removed by using of dryer or heater in Co2 moulding.
• Sometimes over-gassing can cause the sticking of pattern to the mould in Co2 moulding.
• Co2 moulding is mainly used for the increase in strength and hardness of the moulds and cores.
• Co2 moulding process is an ideal process, where speed and flexibility is the prime requirement.
• How much percentage of sodium silicate (Na2SiO3) is added to the sand mixture in Co2 moulding?
• Which of the following additives are added to the sand in Co2 moulding for the improvement in collapsibility of the sand?
• Co2 moulding is a kind of sand moulding, but it is not economical than the green sand moulding.
• Additives can be used for the non-ferrous application to avoid the poor collapsibility of the mould.