McqMate
1. |
Permeability of moulding sand is increased due to/by |
A. | Hard ramming |
B. | Soft ramming |
D. | Clay |
Answer» B. Soft ramming |
2. |
In small castings which of the following allowance can be ignored? |
A. | Machining allowance |
B. | Rapping allowance |
C. | Draft allowance |
E. | Shrinkage allowance |
Answer» B. Rapping allowance |
3. |
The design of gate should be such as to |
A. | avoid erosion of cores and mould cavity |
B. | prevent scum, slag and eroded sand particles from entering the mould cavity |
C. | minimize turbulence and dross formation |
D. | all of the above |
Answer» D. all of the above |
4. |
Mixing coal dust with moulding sand results in |
A. | blackening of the mould |
B. | strong mould |
C. | good air venting |
D. | none of the above |
Answer» A. blackening of the mould |
5. |
The order of dimensional accuracy in die casting is nearly |
B. | 4 percent |
C. | 0.4 percent |
D. | 0.04 percent |
E. | 0.004 percent |
Answer» C. 0.4 percent |
6. |
Hairlines in die casted materials result from |
A. | chemical attack |
B. | mechanical erosion |
C. | thermal fatigue |
D. | all of the above |
Answer» C. thermal fatigue |
7. |
Flux used in cupola while melting cast iron is |
A. | lime stone |
B. | coke slurry |
C. | molasses |
D. | any of the above |
Answer» A. lime stone |
8. |
Which heat treatment is applicable to aluminium alloy castings? |
A. | Stabilizing |
B. | Solution heat treatment |
C. | Artificial ageing |
D. | all of the above |
Answer» D. all of the above |
9. |
Die casting is generally not used for |
A. | cast iron |
B. | zinc base alloys |
C. | aluminium base alloys |
E. | non-ferrous metals |
Answer» A. cast iron |
10. |
The principal ingredients of moulding sands are |
B. | silica sand, carbon, hydrocarbons and moisture |
C. | silica sand, clay and water |
D. | silica sand, dust and crabon |
E. | silica sand, carbon and water |
Answer» C. silica sand, clay and water |
11. |
The function of ejection pin in die casting is to |
A. | pushout casting off the die |
B. | provide movable core spaces |
C. | facilitate die casting of several components |
D. | none of the above |
Answer» A. pushout casting off the die |
12. |
Which of the following process is used for melting of steel? |
A. | L D process |
B. | Kaldo process |
C. | Duplex process |
D. | All of the above |
Answer» D. All of the above |
13. |
Slag and dross can be removed by |
A. | skimming from the molten metal |
B. | using bottom pouring ladle |
C. | using pouring basin in place of a pouring cup |
D. | any of the above |
Answer» D. any of the above |
14. |
Sand acquires a predetermined shape under pressure and retains the same when pressure is removed. This is due to the property of sand known as |
A. | Cohesiveness |
B. | Plasticity |
C. | Refractoriness |
D. | none of the above |
Answer» B. Plasticity |
15. |
Refractoriness in the moulding sand is due to the presence of |
A. | Clay |
B. | Additives and Binders |
C. | Silica |
Answer» C. Silica |
16. |
Heat treatment of castings is usually done for |
A. | refinement of grain structure |
B. | improving machinability |
C. | relieving internal stress |
D. | any of the above |
Answer» D. any of the above |
17. |
Average amount of sand required in a foundry for making one tonne of casting is nearly |
B. | 2 tonnes |
C. | 20 tonnes |
D. | 0.1 tonne |
E. | 0.2 tonne |
Answer» B. 2 tonnes |
18. |
On drying, wood |
A. | expands |
C. | shrinks |
D. | changes colour |
Answer» C. shrinks |
19. |
Aluminium is not a very good material for die casting because |
A. | it is very light but strong |
B. | its melting point is high, it erodes the die surface and tends to react chemically with die |
C. | it cools much slowly |
D. | none of the above |
Answer» B. its melting point is high, it erodes the die surface and tends to react chemically with die |
20. |
Warped castings may be produced due to |
A. | poor collapsibility of cores |
B. | non-provision of camber allowance on the pattern |
C. | weak flasks |
D. | any of the above |
Answer» D. any of the above |
21. |
The most efficient shape of a series is that which |
A. | given a minimum heat loss |
B. | keeps the metal in molten state for longer period |
C. | both (A) and (B) above |
Answer» C. both (A) and (B) above |
22. |
The purpose of clay in a moulding sand is to |
A. | Act as a binder in the mould |
B. | Make the mould refractory |
E. | Mak the mould permeable |
Answer» A. Act as a binder in the mould |
23. |
A defect in castings in which a discontinuity is formed due to the imperfect fusion of two streams of metal in the mould cavity is known as |
A. | scabs |
B. | hot tears |
C. | cold shut |
E. | drops |
Answer» C. cold shut |
24. |
Of the following metals, the pouring rate should be minimum for |
A. | brass |
B. | cast iron |
C. | aluminium |
D. | steel |
Answer» C. aluminium |
25. |
Which of the following metal can be cast in plaster moulds? |
A. | Yellow brass |
B. | Manganese |
C. | Aluminium bronzes |
D. | All of the above |
Answer» D. All of the above |
26. |
High pouring rate leads to |
A. | mould erosion |
B. | rough surface |
C. | excessive shrinkage |
D. | any of the above |
Answer» D. any of the above |
27. |
The most suitable metals for die casting are |
A. | zinc and its alloys |
B. | copper and its alloys |
C. | aluminium and its alloys |
D. | none of the above |
Answer» A. zinc and its alloys |
28. |
All of the following are clamping tools EXCEPT |
A. | Pich dog |
B. | C-clamp |
C. | Hard screw |
D. | Brace |
Answer» D. Brace |
29. |
Pattern draft for external surfaces is (in mm/m) |
B. | 15 -- 50 |
C. | 10 -- 25 |
E. | 40 - 60 |
Answer» C. 10 -- 25 |
30. |
Sand is broadly specified by |
A. | grain size |
B. | colour |
C. | moisture content |
D. | all of the above together |
Answer» A. grain size |
31. |
Chaplets are made of |
A. | wood |
B. | metal |
C. | organic matter |
E. | core sand |
Answer» B. metal |
32. |
Clay content of green sand is usually |
A. | 5 to 10 percent |
B. | 1 to 3 percent |
C. | 30 to 50 percent |
E. | 18 to 30 percent |
Answer» E. 18 to 30 percent |
33. |
The sprue pin/sprue hole used for sand moulds is |
B. | Tapered downwards |
C. | Has no taper at all |
D. | Tapered upwards |
Answer» B. Tapered downwards |
34. |
Pig iron is obtained from iron ore, in a blast furnace by the process of |
A. | oxidation |
B. | desulphurisation |
D. | reduction |
E. | carbonation |
Answer» D. reduction |
35. |
Which of the following statement about gates is incorrect? |
B. | he size of gate depends upon the rate of solidification |
C. | More than one gate may be used to feed a fast freezing casting |
D. | A gate should not have sharp edges |
E. | A small gate is used for castings which solidify rapidly |
Answer» E. A small gate is used for castings which solidify rapidly |
36. |
In case of arc furnaces electric supply for electrodes consists of |
A. | low voltage and high current |
B. | low voltage and low current |
C. | high voltage and high current |
D. | high voltage and low current |
Answer» A. low voltage and high current |
37. |
The sand used for filling the bulk of the moulding flask |
B. | Facing sand |
C. | Dry-sand |
D. | Floor sand |
Answer» D. Floor sand |
38. |
In fluminium foundry, for removing dissolved hydrogen and the entrapped dross, the flux used is |
A. | nitrogen |
B. | helium |
C. | chlorine |
D. | any of the above |
Answer» D. any of the above |
39. |
Choose the correct statement in respect of die casting machine |
A. | In hot chamber die casting machine the metal is melted in the machine itself |
B. | In cold chamber die casting machine metal of low melting point is cast |
C. | In cold chamber die casting machine there is no need to cool the die from outside |
D. | none of the above |
Answer» A. In hot chamber die casting machine the metal is melted in the machine itself |
40. |
The thicker sections of casting will have a tendency to have |
A. | grains coarser than thinner sections |
B. | grains finer than thinner sections |
C. | grains of sme size as rest of the casting |
D. | none of the above |
Answer» A. grains coarser than thinner sections |
41. |
The moulding tool used for finishing/repairing the sand mould after pattern withdrawal is termed as |
B. | Slincks |
D. | Lifters or cleaners |
E. | Trowels |
Answer» D. Lifters or cleaners |
42. |
Which of the following test on castings is based on sound? |
B. | Magnetic particle inspections |
C. | Percussion test |
D. | Impact test |
E. | Radiographic |
Answer» C. Percussion test |
43. |
Presence of sulphur in cast iron |
A. | retards fluidity |
B. | promotes brittleness |
C. | promotes oxidation |
D. | all of the above |
Answer» D. all of the above |
44. |
Hand tool used in foundry shop for mixing and conditioning the foundry sand is termed |
A. | Shovel |
B. | Trowel |
C. | Riddle |
Answer» A. Shovel |
45. |
Shell moulding is uneconomical for |
A. | small castings |
B. | large scale production |
C. | small scale production |
D. | all of the above |
Answer» C. small scale production |
46. |
Shatter test is a measure of |
A. | sand toughness |
B. | sand adhesiveness |
C. | sand cohesiveness |
D. | none of the above |
Answer» A. sand toughness |
47. |
Cohesiveness of sand depends on |
A. | grain size and shape of sand particles |
B. | bonding material |
C. | moisture content |
D. | all of the above |
Answer» D. all of the above |
48. |
Which grain shape of sand particles is least preferred for foundry sands? |
B. | Round |
D. | Compound |
E. | angular |
Answer» B. Round |
49. |
In melting of aluminium, the dross consists of |
A. | oxides of aluminium, magnesium etc. |
B. | sand and dust |
C. | lighter material |
D. | none of the above |
Answer» A. oxides of aluminium, magnesium etc. |
50. |
The disadvantage in using wood as the material for pattern making is |
A. | it is lighter than the metal to be cast |
B. | its different strength along the grains and across the grains |
D. | its low cost |
E. | it gets warped when not stored properly |
Answer» E. it gets warped when not stored properly |
51. |
Distortion in castings can be reduced by |
A. | modifying design |
B. | providing sufficient machining allowance |
C. | improving foundry practice |
D. | all of the above |
Answer» D. all of the above |
52. |
Which of the following facilitates shaking and lifting large pattern from the mould? |
A. | Swab |
B. | Bellows |
D. | Trowel |
E. | Ripping plate |
Answer» E. Ripping plate |
53. |
In die castings, heavy local sections are usually avoided and replaced by |
A. | channel sections |
B. | corrugated forms |
C. | ribs |
D. | any of the above |
Answer» D. any of the above |
54. |
Which inoculant is used to produced ductile iron? |
A. | Graphite |
B. | Carbon |
D. | Fluorides |
E. | Magnesium |
Answer» E. Magnesium |
55. |
There is no need for the withdrawal of pattern from the mould in case of |
A. | patterus with core |
C. | wax patterns |
D. | hollow patterns |
E. | consumable patterns |
Answer» E. consumable patterns |
56. |
Annealing of aluminium castings |
A. | improves ductility |
B. | relieves micro stresses |
C. | reduces tensile strength |
E. | mechanical properties change |
Answer» B. relieves micro stresses |
57. |
The sand mass does not fall out of the moulding box but is held firmly in it when the moulding box is lifted. This is due to the property of |
A. | adhesiveness of sand |
B. | plasticity of sand |
D. | porosity of sand |
E. | refractoriness of sand |
Answer» A. adhesiveness of sand |
58. |
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» D. any of the above |
59. |
For grey cast iron the pouring temperature is |
A. | 1400 to 1465?C |
B. | 1455 to 1495?C |
D. | 1250 to 1290?C |
E. | 1510 to 1532?C |
Answer» E. 1510 to 1532?C |
60. |
Permeability of sand decreases as |
A. | permeability increases |
B. | moisture content increases |
C. | bonding content increases |
D. | all of the above |
Answer» D. all of the above |
61. |
On the interior surfaces the draft allowance is usually |
A. | 40 to 60 mm/metre |
B. | 10 to 20 mm/metre |
D. | 100 to 120 mm/metre |
E. | 200 to 225 mm/metre |
Answer» A. 40 to 60 mm/metre |
62. |
The hardness of the mould is affected by the proportion of ingredients in the sand and |
A. | degree of ramming |
B. | the temperature |
C. | shape of particles |
E. | refractoriness |
Answer» A. degree of ramming |
63. |
In furan process, furan resins are primarily used as |
A. | binders |
B. | chemicals for exothermic reactions |
C. | fluxes |
D. | none of the above |
Answer» A. binders |
64. |
The advantage of investment casting is |
A. | high degree of accuracy |
B. | adaptability to casting of most of the metals |
C. | complex shaped articles can be cast |
D. | all of the above |
Answer» D. all of the above |
65. |
Hot blast of air is supplied to the blast furnace through |
A. | spout |
B. | stoves |
C. | prop |
D. | tuyers |
Answer» D. tuyers |
66. |
Core prints are |
A. | made separately in the mould by hand |
B. | made in the mould be separate pattern |
C. | attached to pattern |
D. | none of the above |
Answer» C. attached to pattern |
67. |
In die casting |
B. | there is no need of air venting |
C. | there is no restriction of material, any material that can be poured can be cast |
D. | the product surface is smooth and clean without the parting line |
E. | the heat loss from molten metal is fast as the mould is metallic |
Answer» E. the heat loss from molten metal is fast as the mould is metallic |
68. |
The water content of green sand is usually |
B. | 1 to 2 percent |
C. | 20 to 25 percent |
D. | 6 to 8 percent |
E. | 12 to 18 percent |
Answer» D. 6 to 8 percent |
69. |
Tin coated low carbon steel chaplets are used in |
A. | ferrous foundries |
B. | non-ferrous foundries |
C. | both (A) and (B) above |
Answer» A. ferrous foundries |
70. |
Scabs may be caused by |
A. | low permeability of sand |
B. | high moisture content of sand |
C. | intermittent running of molten metal over the sand surface |
D. | any of the above |
Answer» D. any of the above |
71. |
The order of surface finish possible in die castings is |
A. | 0.08 microns |
C. | 0.008 microns |
D. | 0.0008 microns |
E. | 0.8 microns |
Answer» E. 0.8 microns |
72. |
The contraction allowance for magnesium is around |
A. | 5 mm/metre |
B. | 14 mm/metre |
D. | 25 mm/metre |
E. | 1 mm/metre |
Answer» B. 14 mm/metre |
73. |
Plaster patterns and core boxes are made of |
A. | White powder |
B. | Plaster of Paris |
C. | Gypsum cement |
D. | Bone china clay |
Answer» C. Gypsum cement |
74. |
Composition of cast iron can be better controlled when melted in |
A. | pit furnace |
B. | cupola |
C. | arc furnace |
D. | none of the above |
Answer» C. arc furnace |
75. |
By compacting the sand |
A. | both density as well as permeability decrease |
C. | density increases and permeability |
D. | both density as well as permeability increase |
E. | density decreases and permeability increases |
Answer» C. density increases and permeability |
76. |
In low temperature die casting the metals whose alloys are cast are |
A. | aluminium and zinc |
B. | zinc and copper |
C. | copper, zinc and lead |
D. | none of the above |
Answer» D. none of the above |
77. |
Moulding sand properties that depend upon size and shape of grains and bonding material are |
A. | plasticity and adhesiveness |
B. | cohesiveness and permeability |
C. | permeability and plasticity |
D. | adhesiveness and cohesiveness |
Answer» B. cohesiveness and permeability |
78. |
Pattern used in foundry shop is |
A. | Somewhat smaller in size than the casting |
D. | Somewhat larger in size than the casting |
E. | Equal in size to the casting |
Answer» D. Somewhat larger in size than the casting |
79. |
The advantage of investment casting is |
A. | Sound costings are produced |
B. | Inricate shapes can be cast |
C. | Close tolerances can be achieved |
D. | All of the above |
Answer» D. All of the above |
80. |
The tool used to make small holes in the sand mould to allow passage of gases/steam is known as |
A. | Vent wire |
B. | Draw screw |
C. | Draw spike |
Answer» A. Vent wire |
81. |
Graphite is sprinkled on to the surface of green sand moulds to |
A. | reduce the number of blow holes |
B. | minimize surface finish |
D. | exclude the burn out effect |
E. | improve surface finish |
Answer» D. exclude the burn out effect |
82. |
If dross and slag along with the liquid metal reach the mould cavity they produce the defect known as |
A. | misrun |
B. | inclusions |
C. | blow holes |
D. | all of the above |
Answer» B. inclusions |
83. |
The permeability of moulding sand depends on |
A. | grain size |
B. | grain shape |
C. | moisture content |
D. | all of the above |
Answer» D. all of the above |
84. |
Highest melting point metal is |
B. | cast iron |
C. | Tungsten |
D. | Steel |
E. | Nickel |
Answer» C. Tungsten |
85. |
Chaplets are |
B. | core binders |
C. | core supports |
D. | mould seats to support core |
E. | core projections |
Answer» C. core supports |
86. |
Which of the following is measuring and layout tool? |
A. | Trammels |
B. | Combination square |
C. | Marking gauge |
D. | all of the above |
Answer» D. all of the above |
87. |
The method in which green sand is generally used is |
A. | pit moulding |
B. | plate moulding |
C. | bench moulding |
D. | none of the above |
Answer» A. pit moulding |
88. |
The amount of machining allowance on castings depends on |
A. | size and shape of the casting |
B. | casting orientation |
C. | characteristics of the metal |
D. | all of the above |
Answer» D. all of the above |
89. |
Which of the following process uses organic binder? |
A. | Shell moulding |
B. | Furan process |
C. | Phenolic isocyanate process |
D. | All of the above |
Answer» D. All of the above |
90. |
Gold melts at |
A. | 1063?C |
B. | 3300?C |
C. | 1444?C |
E. | 2100?C |
Answer» A. 1063?C |
91. |
Which wood is difficult to machine? |
A. | Kiln dried wood |
C. | Old and used wood |
D. | Freshly failed wood |
E. | Seasoned wood |
Answer» D. Freshly failed wood |
92. |
Coke used in cupola is in the form of |
A. | coal dust |
B. | pulverized coal |
C. | lumps |
D. | any of the above |
Answer» C. lumps |
93. |
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» B. thickness of the casting |
94. |
Which of the following statement is correct? |
A. | Less sand is used per tonne of non-ferrous castings than for steel |
D. | More sand is used per tonne of non-ferrous castings than for steel |
Answer» A. Less sand is used per tonne of non-ferrous castings than for steel |
95. |
Skeleton patterns are generally used for |
A. | hollow castings |
B. | small casting |
C. | large castings |
E. | non-ferrous castings |
Answer» C. large castings |
96. |
Sodium silicate in sand in often used as |
A. | binder |
B. | permeability promotion agent |
C. | substitute of clay |
D. | refractory material |
Answer» A. binder |
97. |
Which of the following defect may occur due to improper design of gating system? |
A. | Cold shuts |
B. | Rough surfaces |
C. | Misruns |
D. | any of the above |
Answer» D. any of the above |
98. |
Pit furnace can be used for the melting of |
A. | cast iron |
B. | aluminium |
C. | brass |
D. | any of the above |
Answer» D. any of the above |
99. |
Shell moulding is a process in which |
A. | a mould comprising thin shell is produced by mixing dry silica and resin binder |
C. | a thin shell is cast in sand mould |
E. | a strong core is prepared |
Answer» A. a mould comprising thin shell is produced by mixing dry silica and resin binder |
100. |
Die casting dies are generally made of |
A. | aluminium alloys |
B. | bronze |
D. | cast iron |
E. | alloy steels |
Answer» E. alloy steels |
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