1. In light to medium size malleable iron castings, lake sand constitutes of 30 parts.
a) True
b) False
Explanation: In light to medium size malleable iron castings, lake sand constitutes only 20 parts and bank sand constitutes to 75 parts
2. In sand preparation, which of the following is not used as an additive?
a) Clay
b) Cereal
c) Wax
d) Moisture
Explanation: Among the following, clay and cereals are binders, hence used. Moisture too is needed for sand preparation, but in case of wax, it is not counted among additives.
3. Which of the following process deals with the amount of moisture to be added?
a) Sand mixing
b) Sand preparation
c) Sand conditioning
d) Sand tempering
Explanation: Sand tempering is linked with sand preparation, wherein the amount of moisture needed as an additive is added.
4. Which of the following process deals with preparation the mold sand?
a) Sand mixing
b) Sand preparation
c) Sand tempering
d) Sand conditioning
Explanation: Among sand mixing, sand preparation, sand tempering and sand conditioning, the process that deals with preparation of the mold sand is sand conditioning.
5. Which of the following process deals with mixing the molding sand elements?
a) Sand mixing
b) Sand preparation
c) Sand tempering
d) Sand conditioning
Explanation: In sand preparation, the process which is dealing with the basic preparation of mold sand is called as sand conditioning. The mixing of molding elements of sand is dealt by the process called sand preparation.
6. What is the temperature requirement of sand, for manufacturing?
a) Below 40°C
b) Below 50°C
c) Below 60°C
d) Below 70°C
Explanation: Among the basic conditions of sand, temperature condition is considered an essential factor. The temperature requirement of sand used for manufacturing should be below 40°C.
7. To avoid difficulties in making of molds, sand should be cooled below what temperature?
a) 100°F
b) 120°F
c) 140°F
d) 160°F
Explanation: In sand preparation, the requirement of temperature for production is less than 40°C. The said sand, being used for manufacturing, should be cooled down below 100°F to avoid later difficulties in making the molds.
8. What should be the accuracy of automatic moisture control for manufacturing sands?
a) ± 0.1%
b) ± 0.2%
c) ± 0.3%
d) ± 0.4%
Explanation: In any system, the accuracy in its working is considered to be one of the most essential features of that process. The accuracy of automatic moisture control for manufacturing sand must be ± 0.1%.
9. A low speed muller is used in mechanized foundries.
a) True
b) False
Explanation: In mechanized foundries, a high speed muller is essentially used which rotates in a horizontal direction.
10. How much time is taken by sand, for sand preparation in terms of muller time?
a) 33 to 50 percent of muller time
b) 14 to 29 percent of muller time
c) 25 to 40 percent of muller time
d) 46 to 62 percent of muller time
Explanation: Muller time is the time needed for the high speed muller to complete its function. For sand preparation, approximately 33 to 50 percent of muller time is needed.