Lesson 9 Self-Check Questions Self-Check Questions Download
1. Which one of the following is not a moulding process?
a. Green sand moulding
b. Red sand moulding
c. Plaster moulding
d. Carbon-dioxide moulding
2. The main advantage of using Carbon dioxide moulding is that
a. gases can be made to escape more easily
b. much hardened mould is obtained
c. gases formed react with carbon dioxide to form a colloidal solution
d. carbon % in the molten metal can be increased
3. In squeeze moulding machine the:
a. sand in the mould is rammed by applying uniform pressure with the help of a plate
b. compactness of sand is lowest at the surface of the plate while it increases towards the pattern
c. metal in the mould is introduced under pressure
d. machine table is vibrated so that the mould is squeezed
4. The sand is sprayed with great force for the purpose of ramming in which type of machine moulding?
a. Jolting
c. Squeezing
b. Jolt squeezing
d. Sand slinging
5. Sand slingers are the moulding machines in which
a. metal in the mould is introduced under pressure
b. carbon % in the molten metal can be increased
c. the machine table is jolted to obtaine uniform compactness of sand
d. particles of moulding sand are thrown on the pattern with a certain velocity
6. In carbon dioxide moulding, the bindle material used is
a. Sodium silicate
c. Dextrin
b. Sodium carbonate
d. Molasses
Possible answers to self check questions