This set of Metal Casting Multiple Choice Questions & Answers (MCQs) focuses on “Molding Sands Binders”.
1. On increasing the binder content, what in the moulding sand gets reduced?
a) Hardenability
b) Strength
c) Permeability
d) Brittleness
View Answer
Explanation: On increasing the binder content, the hardenability does not get affected. The strength and the brittleness to do not change, but on addition of too much of binder in the moulding sand, the permeability of the moulding sand gets reduced.
2. Which of the following is bentonite?
a) Kaolinite
b) Sodium Montmorillonite
c) Illite
d) Limonite
View Answer
Explanation: Bentonite sands are one of the most useful additive in casting sands, as it helps in enhancing its properties. Bentonite is classified into 2 types, namely, Sodium montmorillonite and Calcium montmorillonite.
3. Which of the following is not a clay binder?
a) Limonite
b) Illite
c) Limonite
d) Carsil
View Answer
Explanation: Carsil is a type of patented binder. Carsil is known to be a product of foseco and is therefore called as foseco-product, while the other three types mentioned above are all different types of clay binders.
4. Clays are what type of binders?
a) Organic
b) Patented
c) Inorganic
d) Other binders
View Answer
Explanation: Clay binders come under the category of inorganic binders. Clay binders are basically known to provide the casts with some good amount of binding properties and optimum moisture contents.
5. At what temperature does the clay dead burning take place?
a) 400°C – 500°C
b) 500°C – 600°C
c) 600°C – 700°C
d) 700°C – 800°C
View Answer
Explanation: Clay dead burning is a process that needs to be taken place at a comparatively higher temperature. The temperature at which the clay dead burning takes place is somewhere in between 500°C and 600°C.
6. What is the breadth size range of a clay particle?
a) 0.01-1 micrometres
b) 0.02-2 micrometres
c) 0.03-3 micrometres
d) 0.04-4 micrometres
View Answer
Explanation: The particles of clay are very small and need high precision microscopes to determine its size. Clay particles in their breadth have a particle size range in between 0.01 micrometres to 1 micrometres.
7. Which of the following clay binders are most commonly used?
a) Bentonite
b) Illite
c) Limonite
d) Kaolinite
View Answer
Explanation: Bentonite is the most commonly used clay binder because of its ability to produce strong bonds inside the moulding sands. Bentonite is classified into 2 types, namely, Sodium montmorillonite and Calcium montmorillonite.
8. What is the percentage composition of quartz in Western bentonite?
a) 5%
b) 10%
c) 15%
d) 20%
View Answer
Explanation: Bentonite is classified into 2 types, namely, Sodium montmorillonite and Calcium montmorillonite. Western bentonite also called Sodium montmorillonite is known to have a percentage composition 10% of quartz.
9. What is the percentage composition of quartz in Southern bentonite?
a) 5%
b) 10%
c) 15%
d) 20%
View Answer
Explanation: Bentonite is classified into 2 types, namely, Sodium montmorillonite and Calcium montmorillonite. Southern bentonite also called as Calcium montmorillonite is known to have a percentage composition 15% of quartz.
10. What is the softening point of western montmorillonite?
a) 800°F – 1150°F
b) 1200°F – 1650°F
c) 1750°F – 2100°F
d) 2100°F – 2450°F
View Answer
Explanation: Bentonite is classified into 2 types, namely, Sodium montmorillonite and Calcium montmorillonite. Western bentonite also called as Sodium montmorillonite is known to have its softening point in the range of 2100°F – 2450°F.
11. What is the softening point of western montmorillonite?
a) Above 1800°F
b) Above 2000°F
c) Above 2200°F
d) Above 2400°F
View Answer
Explanation: Bentonite is classified into 2 types, namely, Sodium montmorillonite and Calcium montmorillonite. Southern bentonite also called as Calcium montmorillonite is known to have its softening point above 1800°F
12. Illite has a softening point of about 4500°F.
a) True
b) False
View Answer
Explanation: Illite is a decomposition product due to weathering, and is found in natural moulding sands. It has its softening temperature at about 2500°F.
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