Engineering :: Foundry Technology
|
|
|
|
|
71. |
Graphite is sprinkled on to the surface of green sand moulds to |
A. |
exclude the burn out effect |
B. |
improve surface finish |
C. |
minimize surface finish |
D. |
reduce the number of blow holes |
Answer: Option A
Explanation:
|
72. |
Which of the following is used to increase refractoriness of sand? |
A. |
Graphite |
B. |
Silica flour |
C. |
Iron free zirconium |
D. |
all of the above |
Answer: Option D
Explanation:
|
73. |
Which of the following is used as protective admixture in moulding sand for magnesium castings? |
A. |
Boric acid |
B. |
Sublimed sulphur |
C. |
Fluoric additives |
D. |
Any of the above |
Answer: Option D
Explanation:
|
74. |
Head storage capacity of moulding sand can be increased by adding? |
A. |
graphite |
B. |
chromite |
C. |
magnesium powder |
D. |
any of the above |
Answer: Option B
Explanation:
|
75. |
Addition of saw dust to moulding sand increases its |
A. |
gas permeability |
B. |
refractoriness |
C. |
cohesiveness |
D. |
all of the above |
Answer: Option A
Explanation:
|
76. |
Shatter test is a measure of |
A. |
sand toughness |
B. |
sand adhesiveness |
C. |
sand cohesiveness |
D. |
none of the above |
Answer: Option A
Explanation:
|
77. |
Which of the following is a screen? |
Answer: Option B
Explanation:
|
78. |
A slick is mainly used for |
A. |
making openings in mould |
B. |
providing openings in the mould |
C. |
repairing and finishing of mould |
D. |
removing pattern from the mould |
Answer: Option C
Explanation:
|
79. |
Swab is used for |
A. |
applying water to the mould around the edge of the pattern |
B. |
shaking pattern to facilitate its with drawl from the mould |
C. |
repairing and finishing of mould |
D. |
none of the above |
Answer: Option A
Explanation:
|
80. |
Which of the following facilitates shaking and lifting large pattern from the mould? |
A. |
Trowel |
B. |
Swab |
C. |
Bellows |
D. |
Ripping plate |
Answer: Option D
Explanation:
|
Read more:
|
|