# Casting Questions and Answers – Molding Sand Mixtures for Casting

This set of Metal Casting Multiple Choice Questions & Answers (MCQs) focuses on “Molding Sand Mixtures For Casting”.

1. In the green sand moulding of steel casting, what is the bentonite percentage composition?
a) 1.5%
b) 2.5%
c) 3.5%
d) 4.5%

Explanation: In green sand mouldings of steel castings, the dextrin percentage is quite lower, it is around 0.5%. The bentonite percentage composition in green sand molding is calculated to be 3.5%.

2. In the green sand moulding of steel casting, what is the dextrine percentage composition?
a) 0.5%
b) 1.5%
c) 2.5%
d) 3.5%

Explanation: In green sand mouldings of steel castings, the dextrine percentage composition is calculated to be 0.5% and the bentonite percentage in the same green sand is higher than dextrin by around 3%.

3. In the green sand moulding of steel casting, what is the moisture percentage composition?
a) 1% – 2%
b) 2% – 3%
c) 3% -4%
d) 4% – 5%

Explanation: In green sand mouldings of steel castings, the moisture percentage composition is calculated to be 3%- 4% and the amount of bentonite present in the same green sand is around 3.5%.

4. In dry sand moulding of steel casting, what is the bentonite percentage composition?
a) 1%
b) 2%
c) 4%
d) 5%

Explanation: In dry sand mouldings of steel castings, the bentonite percentage composition is calculated to be 5% and in green sand, the bentonite percentage is calculated to be 3.5%.

5. In dry sand moulding of steel casting, what is the dextrine percentage composition?
a) 0.5%
b) 1.5%
c) 2.5%
d) 3.5%

Explanation: In dry sand mouldings of steel castings, the dextrine percentage composition is calculated to be 0.5%. In green sands, the dextrin content is also 0.5%, which is in green sand and in dry sand, the percentage of dextrine is same.

6. In green sand moulding of steel casting, what is the moisture percentage composition?
a) 2-3%
b) 3-4%
c) 4-5%
d) 5-6%

Explanation: In dry sand mouldings of steel castings, the moisture percentage composition is calculated to be 5-6%. In green sands, the moisture content is relatively lower than dry sands. It is around 3% to 4%.

7. In synthetic sands of aluminium alloys, what is the bentonite percentage composition?
a) 2-5%
b) 3-5%
c) 4-5%
d) 5-6%

Explanation: In synthetic sands of aluminium alloys, the bentonite percentage composition is calculated to be 4-5%. Whereas, in the case of green sands, the bentonite percentage is recorded to be around 3.5%.

8. In gray iron castings of facing sand mixtures, what is the bentonite percentage composition?
a) 2-3%
b) 3-4%
c) 4-5%
d) 5-6%

Explanation: In gray cast irons of facing sand mixtures, the bentonite percentage composition is calculated to be 2-3%. Whereas, in the case of green sands, the bentonite percentage is recorded to be around 3.5%.

9. In magnesium alloys, what is the bentonite percentage composition?
a) 1%
b) 2%
c) 3%
d) 4%

Explanation: In magnesium alloys, the bentonite percentage composition is calculated to be 4%. Whereas, in the case of green sands, the bentonite percentage is recorded to be around 3.5%.

10. In magnesium alloys, the water content in percentage is 10%.
a) True
b) False

Explanation: In magnesium alloys, the water content in terms of percentage is not 10%. The amount of water in terms of percentage composition is much lower than that. The composition of water around 2%.

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