1. . The degree or intensity of ramming _________
(A) Increases bulk density
(B) Decreases bulk density
(C) Does not change bulk density
(D) Can increase as well as decrease bulk density
2. . Permeability of green sand ________
(A) Increases with ramming
(B) Decreases with ramming
(C) Can increase and decrease as well with the amount of ramming
(D) Does not alter with ramming
3. . Natural molding sand have which of the following quality(/ies) ________
(A) Freely available in abundance
(B) Contains clay in a large amount
(C) Moisture content range is wider
(D) All of the mentioned
4. . R.P.M stands for which of the following molding process?
(A) Rotor Plastic Molding
(B) Raisin Pit Molding
(C) Rubber Plaster Molding
(D) Rough Print Molding
5. . The dried plaster mold have __________
(A) Low permeability
(B) High permeability
(C) Moderate permeability
(D) Same amount of permeability as other molds
6. . Pit molding is used for _________
(A) Low weighting castings
(B) Moderate weighting castings
(C) Heavy weighting castings
(D) Making castings that requires less time to process
7. . Which of the following is a principle binder used in carbon dioxide molding?
(A) Carbon
(B) Carbon Dioxide
(C) Sodium
(D) Sodium silicate
8. . Which of the following compound forms the bond between sand particles in carbon dioxide molding process?
(A) Sodium
(B) Amorphous silica
(C) Dehydrated water
(D) Carbon Monoxide
9. . Which of the following is the principal material used for Nobake molding process?
(A) Furan or Urethane
(B) Wood saw
(C) Clay-bentonite
(D) Water only
10. . In Nobake molding process, the chemical process of hardening of binder starts when ___________
(A) The sand is poured into the mixture
(B) The sand is taken out of the mixture
(C) The mixture is poured into the molding flask
(D) When the molten metal is poured into the cavity