1. Which of the following is not a source of moulding sand?
a) Sea
b) Lakes
c) Desert
d) Forests
Answer: d
2. Which of the following is not a type of moulding sand?
a) Red sand
b) Natural sand
c) Synthetic sand
d) Loam sand
Answer: a
3. What is the percentage composition of clay in natural sand?
a) 22-31%
b) 3-10%
c) 5-20%
d) 18-29%
Answer: c
4. What is the percentage composition of water in natural sands?
a) 2-4%
b) 5-8%
c) 6-9%
d) 10-13%
Answer: b
5. What is mixed with natural sand to make it semisynthetic sand?
a) Bentonite
b) Barelelne
c) Cubane
d) Prismane
Answer: a
6. Which sand is used for casting cast irons and non-ferrous metals?
a) Loam Sand
b) Natural Sand
c) Synthetic Sand
d) Refractory sand grain
Answer: b
7. Natural sands are economical than synthetic sands.
a) True
b) False
Answer: a
8. What is the amount of clay content in Loam sand?
a) 30%
b) 40%
c) 50%
d) 60%
Answer: c
9. Which sand is used for making ferrous and non-ferrous alloys?
a) Natural sand
b) Synthetic sand
c) Loam sand
d) Refractory sand grain
Answer: b
10. A general loam sand mixture contains how many volumes of silica?
a) 10
b) 20
c) 30
d) 40
Answer: b
11. The figure below shows which foundry sand grain shape?
a) Round
b) Sub angular
c) Angular
d) Compound
Answer: c
12. The figure below shows which foundry sand grain shape?
a) Round
b) Sub angular
c) Angular
d) Compound
Answer: a
13. Round grain has higher permeability than angular grains.
a) True
b) False
Answer: a
14. The figure below shows which foundry sand grain shape?
a) Round
b) Sub angular
c) Angular
d) Compound
Answer: d
15. On increasing the binder content, what in the moulding sand gets reduced?
a) Hardenability
b) Strength
c) Permeability
d) Brittleness
Answer: c
16. Which of the following is bentonite?
a) Kaolinite
b) Sodium Montmorillonite
c) Illite
d) Limonite
Answer: b
17. Which of the following is not a clay binder?
a) Limonite
b) Illite
c) Limonite
d) Carsil
Answer: d
18. Clays are what type of binders?
a) Organic
b) Patented
c) Inorganic
d) Other binders
Answer: c
19. 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
Answer: b
20. 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
Answer: a
21. Which of the following clay binders are most commonly used?
a) Bentonite
b) Illite
c) Limonite
d) Kaolinite
Answer: a
22. What is the percentage composition of quartz in Western bentonite?
a) 5%
b) 10%
c) 15%
d) 20%
Answer: b
23. What is the percentage composition of quartz in Southern bentonite?
a) 5%
b) 10%
c) 15%
d) 20%
Answer: c
24. 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
Answer: d
25. What is the softening point of western montmorillonite?
a) Above 1800°F
b) Above 2000°F
c) Above 2200°F
d) Above 2400°F
Answer: a
26. Illite has a softening point of about 4500°F.
a) True
b) False
Answer: b
27. Which of the following is not a characteristic property of any moulding sand?
a) Flowability
b) Hardenability
c) Green strength
d) Dry strength
Answer: b
28. What does a mould having adequate green strength, does not have?
a) Ability to retain its shape
b) Ability not to get distorted
c) Ability not to collapse
d) Ability to retain hardness
Answer: d
29. Dry sand does not have the strength for what functions?
a) To withstand corrosion forces
b) To withstand pressure of molten metal
c) To be able to retain its shape
d) To be able to retain the hardenability
Answer: d
30. Hot strength is seen at what temperature?
a) Above 212°F
b) Above 312°F
c) Above 412°F
d) Above 512°F
Answer: a
31. Which of the following would not happen if hot strength is not enough?
a) The mould may get hardened
b) The mould may get enlarged
c) The mould may get eroded
d) The mould may crack
Answer: a
32. Why should the moulding sand be porous?
a) For gases to enter
b) For gases to escape
c) For water to enter
d) For water to escape
Answer: b
33. Which of the following is not a defect if permeability is not enough?
a) Brittleness
b) Gas holes
c) Mould blast
d) Surface blows
Answer: a
34. In green sand what is the amount of water used?
a) 5%
b) 10%
c) 15%
d) 20%
Answer: a
35. What is the amount of clay needed in green sand?
a) 5% – 10%
b) 5% – 15%
c) 15% – 30%
d) 25% – 40%
Answer: c
36. Parting sand is a type of moulding sand.
a) True
b) False
Answer: a
37. Which of the following is not refractory sand?
a) Olivine
b) Silica Sand
c) Dolomite
d) Barium Chloride
Answer: d
38. Which refractory sand has the best moulding material?
a) Silica sand
b) Magnesite
c) Zircon
d) Olivine
Answer: a
39. Ganister is another name for which sand?
a) Magnesite
b) Zircon
c) Silica sand
d) Dolomite
Answer: c
40. At what temperature, does quartz melt completely?
a) 1725°C
b) 1925°C
c) 1825°C
d) 2025°C
Answer: a
41. Which of the following is the most porous sand?
a) Silica sand
b) Zircon
c) Olivine
d) Dolomite
Answer: a
42. At what temperature does the silica sand start expanding thermally?
a) 918°F
b) 843°F
c) 1063°F
d) 1124°F
Answer: c
43. Which of the following factor is not to be considered while selecting a refractory?
a) Conductivity
b) Expansion
c) Size of the particle
d) Permeability
Answer: d
44. Which sand is generally used repetitively for mould making?
a) Silica sand
b) Zircon
c) Olivine
d) Dolomite
Answer: a
45. Which of the following sand is freely available?
a) Silica sand
b) Zircon
c) Olivine
d) Dolomite
Answer: a
46. Silica sand is expensive.
a) True
b) False
Answer: b
47. The size and shape of particles in the soil cannot reflect material composition and grain formation.
a) True
b) False
Answer: b
48. The grain size distribution of soil basically determines inter-particle forces and its packing.
a) True
b) False
Answer: a
49. Quartz grains are generally fine or small in shape and size during analysis of quartz.
a) True
b) False
Answer: b
50. Large particles in soil increase the chances of imperfection and brittle failure.
a) True
b) False
Answer: a
51. Which of the following equipment can be used for determining the grain size of soil particles?
a) Sprue
b) Gate
c) Runner
d) Sieve
Answer: d
52. Analysis of very small size grains of soil can also be possible by using sieves.
a) True
b) False
Answer: b
53. In a hydrometer test, a dispersing agent is mixed with water to increase its density.
a) True
b) False
Answer: a
54. It becomes easier to read the bottom part of the meniscus when the hydrometer is in a soil suspension.
a) True
b) False
Answer: b
55. In a hydrometer test, soil used should be dispersed first in order to eliminate particle coagulation.
a) True
b) False
Answer: a
56. The grain size distribution is mainly carried out to determine the strength and permeability of the soil.
a) True
b) False
Answer: a
57. Which of the following is not a bonding theory?
a) Electrostatic bonding theory
b) Hot strength theory
c) Surface tension theory
d) Block and wedge theory
Answer: b
58. In which of the following bonding theory, water molecules break down to form H+ and OH- ions?
a) Electrostatic bonding theory
b) Hot strength theory
c) Surface tension theory
d) Block and wedge theory
Answer: a
59. What does the clay particle absorb in electrostatic bonding theory?
a) Complete water
b) H+ ions
c) OH–ions
d) Sand grains
Answer: c
Explanation: The OH– ions are basically the base ions. The clay particles in electrostatic bonding theory, absorb the OH– ions because of the not satisfied valence bond.
60. For bonding action of clays, what is the amount of water needed?
a) 1.5%-8%
b) 3.5%-11%
c) 4.5%-12%
d) 5.5%-13%
Answer: a
61. What is the amount of sea coal needed in cast irons for small casting moulding sands?
a) 1%
b) 2%
c) 3%
d) 4%
Answer: a
62. What is the amount of sea coal needed in cast irons for large green casting moulding sands?
a) 10%
b) 15%
c) 20%
d) 25%
Answer: a
63. At what temperature is pitch distilled from soft coals?
a) 400°F
b) 500°F
c) 600°F
d) 700°F
Answer: c
64. Pitch maybe used up to what percent?
a) 1%
b) 2%
c) 3%
d) 4%
Answer: b
65. Which of the following increases the dry strength of the sand?
a) Iron oxides
b) Fuel oils
c) Cereals
d) Dextrin and molasses
Answer: d
66. Cereals improve flowability and lower collapsibility.
a) True
b) False
Answer: b
67. How much should fuel oil be added to increase the moulding ability of sand?
a) 0.01% – 0.1%
b) 0.02% – 0.2%
c) 0.03% – 0.3%
d) 0.04% – 0.4%
Answer: a
68. How much time does a centrifugal muller take to mix the core ingredients?
a) 20 – 50 seconds
b) 10 – 40 seconds
c) 50 – 80 seconds
d) 60 – 90 seconds
Answer: d
69. How much time does a normal muller take to mix the core ingredients?
a) 2 – 5 minutes
b) 3 – 6 minutes
c) 4 – 7 minutes
d) 5 – 9 minutes
Answer: b
70. What is the baked tensile strength of light to medium size malleable iron castings?
a) 4.5 kg/cm2
b) 5.5 kg/cm2
c) 6.5 kg/cm2
d) 7.5 kg/cm2
Answer: b
71. What is the dry tensile strength of core sand mixture for general purpose?
a) 15 kg/cm2
b) 16 kg/cm2
c) 17 kg/cm2
d) 18 kg/cm2
Answer: c
72. What is the dry compression strength of core sand mixture for general purpose?
a) 50 kg/cm2
b) 60 kg/cm2
c) 70 kg/cm2
d) 80 kg/cm2
Answer: c
73. What is the green compression strength of core sand mixture for general purpose?
a) 1/5 kg/cm2
b) 1/6 kg/cm2
c) 1/7 kg/cm2
d) 1/8 kg/cm2
Answer: c
74. What is the green compression strength of light to medium size malleable iron castings?
a) 0.05 kg/cm2
b) 0.06 kg/cm2
c) 0.07 kg/cm2
d) 0.08 kg/cm2
Answer: d
75. What is the water content in light to medium size malleable iron castings?
a) 3.2%
b) 4.2%
c) 5.2%
d) 6.2%
Answer: b
76. What is the amount of green permeability in light to medium size malleable iron castings?
a) 34 cc/min
b) 44 cc/min
c) 54 cc/min
d) 64 cc/min
Answer: b
77. In light to medium size malleable iron castings, lake sand constitutes of 30 parts.
a) True
b) False
Answer: b
78. Foundry sands cannot be obtained in which of the following states?
a) Uttar Pradesh
b) Punjab
c) Orissa
d) Bihar
Answer: d
79. Foundry sand is found in which part of Maharashtra?
a) Satara
b) Mumbai
c) Nagpur
d) Nasik
Answer: a
8. Which of the following is not a core sand property?
a) Dry strength
b) Hardness
c) Low collapsibility
d) Good Permeability
Answer: c
81. Good friability is one of the properties of core sand.
a) True
b) False
Answer: a
82. Which of the following is not a core sand ingredient?
a) Water
b) Wax
c) Granular refractories
d) Core binders
Answer: b
83. What is the melting point of Zircon?
a) 3450°F – 4620°F
b) 3750°F – 4820°F
c) 3850°F – 4820°F
d) 4400°F – 5320°F
Answer: a
84. What is the melting point of Olivin?
a) 3450°F – 4620°F
b) 3200°F – 3450°F
c) 3100°F – 3220°F
d) 3400°F – 3620°F
Answer: b
85. What is the melting point of Chamotte?
a) 3450°F – 4620°F
b) 3200°F – 3450°F
c) 3100°F – 3200°F
d) 3400°F – 3620°F
Answer: c
86. What is the melting point of Silica, for granular refractories?
a) 3453°F
b) 3206°F
c) 3119°F
d) 3467°F
Answer: c
87. For the granular refractories, what is the melting point of Carbon?
a) 6800°F
b) 6200°F
c) 6400°F
d) 6500°F
Answer: c
88. 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%
Answer: c
89. 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%
Answer: a
90. 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%
Answer: c
91. In dry sand moulding of steel casting, what is the bentonite percentage composition?
a) 1%
b) 2%
c) 4%
d) 5%
Answer: d
92. 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%
Answer: a
93. 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%
Answer: d
94. In synthetic sands of aluminium alloys, what is the bentonite percentage composition?
a) 2-5%
b) 3-5%
c) 4-5%
d) 5-6%
Answer: c
95. 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%
Answer: a
96. In magnesium alloys, what is the bentonite percentage composition?
a) 1%
b) 2%
c) 3%
d) 4%
Answer: d
97. In magnesium alloys, the water content in percentage is 10%.
a) True
b) False
Answer: b
98. Which of the following materials presents in clay which imparts plasticity in it?
a) Silica
b) Phyllosilicates
c) Calcium
d) Sodium
Answer: b
99. Which of the following components of soil are acts as chemical sponges in the soil?
a) Clay minerals
b) Silica
c) Sodium
d) Potassium
Answer: a
100. The attraction of clay minerals with water is a surface phenomenon which is called absorption.
a) True
b) False
Answer: b
101. Kaolinite clay mineral generally adsorbs fewer ions than that of other clay minerals.
a) True
b) False
Answer: a
102. The layer structure of kaolinite mineral totally consists of three tetrahedral silicate sheets.
a) True
b) False
Answer: b
103. Which of the following members of clay minerals is formed by the decompositions of micas?
a) Chlorite
b) Illite
c) Kaolinite
d) Vermiculite
Answer: d
104. Which of the following types of clay mineral includes potassium in the layer structure?
a) Chlorite
b) Vermiculite
c) Illite
d) Kaolinite
Answer: c
105. Palygorskite and sepiolite clay minerals generally have similar fibrous structures.
a) True
b) False
Answer: a
106. Ball clay is a type of clay which has zero percent moisture or water content in it.
a) True
b) False
Answer: b
107. Repeated freezing and melting of fire clay can improve the plasticity of the clay material.
a) True
b) False
Answer: a