McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Mechanical Engineering .
| 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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