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