Engineering :: Foundry Technology
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61. |
Oil used for core sand is |
A. |
molasses |
B. |
linseed oil |
C. |
mineral oil |
D. |
any of the above |
Answer: Option D
Explanation:
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62. |
The principal ingredients of moulding sands are |
A. |
silica sand, carbon and water |
B. |
silica sand, clay and water |
C. |
silica sand, dust and crabon |
D. |
silica sand, carbon, hydrocarbons and moisture |
Answer: Option B
Explanation:
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63. |
Which of the following sand must possess high refractoriness? |
A. |
Backing sand |
B. |
Parting sand |
C. |
Facing sand |
D. |
all of the above |
Answer: Option C
Explanation:
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64. |
Clay used for foundry sand should be |
A. |
kaolinite |
B. |
montmorillonite |
C. |
illite |
D. |
any of the above |
Answer: Option D
Explanation:
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65. |
Which grain shape of sand particles is least preferred for foundry sands? |
A. |
Round |
B. |
angular |
C. |
Compound |
Answer: Option A
Explanation:
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66. |
Which of the following is used on moulds for magnesium castings to prevent metal mould reactions? |
A. |
Boric sulphur |
B. |
Molasses |
C. |
Charcoal |
D. |
all of the above |
Answer: Option A
Explanation:
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67. |
Which of the following is used to obtain fine surface finish in ferrous castings? |
A. |
Ground pitch |
B. |
Sea coal |
C. |
Gilsonite |
D. |
any of the above |
Answer: Option D
Explanation:
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68. |
The burnt on sand causes difficulty in |
A. |
machining of castings |
B. |
removal of castings from moulds |
C. |
separation of sand and castings after pouring |
D. |
all of the above |
Answer: Option A
Explanation:
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69. |
Which of the following is the anti-penetration material introduced in the moulding sand? |
A. |
Coad dust |
B. |
Powdered quartz |
C. |
Black oil |
D. |
all of the above |
Answer: Option D
Explanation:
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70. |
The amount of coal dust added to moulding sand depends on |
A. |
shape of the casting |
B. |
thickness of the casting |
C. |
temperature of pouring |
D. |
none of the above |
Answer: Option B
Explanation:
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