MCQOPTIONS
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MCQOPTIONS
This section includes 657 Mcqs, each offering curated multiple-choice questions to sharpen your Testing Subject knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Consumable patterns are made of |
| A. | polystyrene |
| B. | wax |
| C. | plaster of paris |
| D. | any of the above |
| Answer» B. wax | |
| 2. |
Clay used for foundry sand should be |
| A. | kaolinite |
| B. | montmorillonite |
| C. | illite |
| D. | any of the above |
| Answer» E. | |
| 3. |
Phenolic thermo-setting plastics are finding application in pattern making because |
| A. | they do not absorb moisture |
| B. | they are resistant to wear |
| C. | they have all above qualities |
| D. | they are strong |
| Answer» E. | |
| 4. |
Shrinkage cavity in a casting may be formed due to |
| A. | haphazard solidification of metal |
| B. | improperly sized gating |
| C. | high pouring temperatures |
| D. | any of the above |
| Answer» E. | |
| 5. |
Aluminium castings are not repaired by |
| A. | inert gas metal arc welding |
| B. | braze welding |
| C. | soldering |
| D. | All of the above |
| Answer» C. soldering | |
| 6. |
Moisture content of the moulding sand is commonly |
| A. | 5% - 15% |
| B. | 1% - 4% |
| C. | 2% - 8% |
| Answer» D. | |
| 7. |
Chemical dipping of die casted parts is usually done for |
| A. | flash removal |
| B. | dimensional stability |
| C. | corrosion protection |
| D. | none of the above |
| Answer» D. none of the above | |
| 8. |
A casting process which can produce cylinders by inserting cores into molten metal poured in the mould is |
| A. | Semi permanent mould casting |
| B. | pressed casting |
| C. | permanent mould or gravity die casting |
| D. | none of the above |
| Answer» C. permanent mould or gravity die casting | |
| 9. |
According to Chvorinov's equation, the solidification time of castings is |
| A. | Directly proportional to square of the volume of the casting |
| B. | inversely proportional to the volume the casting |
| C. | inversely proportional to square of the volume of the casting |
| D. | directly proportional to the volume of the castings |
| Answer» B. inversely proportional to the volume the casting | |
| 10. |
The advantage of permanent mould casting is |
| A. | reduced labour charges |
| B. | reduced mould cost |
| C. | dense, fine grained structure |
| D. | all of the above |
| Answer» E. | |
| 11. |
As the moisture content of sand increases |
| A. | permeability remains unchanged |
| B. | permeability decreases |
| C. | permeability increases |
| Answer» E. | |
| 12. |
In case of malleable iron castings, the contraction allowance on pattern |
| A. | is independent of section thickness |
| B. | increass as the section thickness of casting increases |
| C. | decreases as the section thickness of casting increases |
| Answer» F. | |
| 13. |
Graphitic cast iron is |
| A. | hard |
| B. | non-machinable |
| C. | low in damping capacity |
| D. | high in compressive strength |
| Answer» F. | |
| 14. |
The function of riser is |
| A. | to allow the heat of molten metal to dissipate to atmosphere |
| B. | to provide an opening through which molten metal is poured |
| C. | to give an indication that mould is filled |
| D. | to supply molten metal to casting as it tends to contract during solidification |
| Answer» F. | |
| 15. |
Inoculants are added to aluminium mainly for |
| A. | grain refinement |
| B. | directional solidification |
| C. | purification |
| D. | all of the above |
| Answer» B. directional solidification | |
| 16. |
Which parameter can be used for the measurement of melt in a foundry? |
| A. | Thermo couple pyrometer |
| B. | Optical pyrometer |
| C. | Radiation pyrometer |
| D. | none of the above |
| Answer» E. | |
| 17. |
Melting point of copper |
| A. | 1444?C |
| B. | 1576?C |
| C. | 665?C |
| D. | 1083?C |
| Answer» F. | |
| 18. |
In investment casting the pattern is made of |
| A. | wood |
| B. | urea formaldehyde |
| C. | wax |
| D. | none of the above |
| Answer» D. none of the above | |
| 19. |
When sulphur is to be removed from cast iron while melting the same in cupola, the flux used is |
| A. | molasses |
| B. | sodium carbonate with lime stone |
| C. | zinc sulphate with lime stone |
| D. | none of the above |
| Answer» C. zinc sulphate with lime stone | |
| 20. |
Permanent mould casting is also known as |
| A. | chill casting |
| B. | short casting |
| C. | gravity die casting |
| D. | slush casting |
| Answer» D. slush casting | |
| 21. |
Which of the following holes appear on the surface of the casting when it is machined? |
| A. | Pin holes |
| B. | Slag holes |
| C. | Gas holes |
| D. | Blow holes |
| Answer» D. Blow holes | |
| 22. |
Contraction allowance for grey cast iron is (in mm/m) |
| A. | 21 |
| B. | 30 |
| C. | 10.5 |
| Answer» F. | |
| 23. |
In case of plaster moulding the mould is prepared in |
| A. | gypsum plaster |
| B. | slacked lime |
| C. | lime + cement |
| D. | any of the above |
| Answer» B. slacked lime | |
| 24. |
Electric furnaces can usually operate upto a temperature of |
| A. | 1250?C |
| B. | 1700?C |
| C. | 2200?C |
| D. | 1000?C |
| Answer» C. 2200?C | |
| 25. |
In case of copper, the pouring temperature is around |
| A. | 1160?C |
| B. | 1060?C |
| C. | 1260?C |
| D. | 1450?C |
| Answer» B. 1060?C | |
| 26. |
Which statement is not true for green sand moulding? |
| A. | Moulds are cheapest |
| B. | Preparation of moulds is less time consuming |
| C. | Defect free and castings with good surface is obtained |
| D. | none of the above |
| Answer» D. none of the above | |
| 27. |
Swelling of castings may occur due to |
| A. | insufficient ramming |
| B. | rapid pouring of molten metal |
| C. | insufficient weight on the moulds during pouring |
| D. | any of the above |
| Answer» E. | |
| 28. |
A mould cracks after drying. It indicates |
| A. | excess of clay |
| B. | lack of clay |
| C. | coarse irregular grains |
| D. | none of the above |
| Answer» B. lack of clay | |
| 29. |
Rough surface of casting may result from |
| A. | high permeability of sand |
| B. | large grain size |
| C. | soft ramming |
| D. | any of the above |
| Answer» E. | |
| 30. |
Solidification time for riser should be |
| A. | less than that of the casting |
| B. | same as that for the casting |
| C. | more than that of the casting |
| Answer» F. | |
| 31. |
Lowest pouring temperature alloy is |
| A. | Phosphor bronze |
| B. | Cupro nickel alloy |
| C. | Monel metal |
| D. | Tin bronze |
| Answer» D. Tin bronze | |
| 32. |
High pouring rate leads to |
| A. | mould erosion |
| B. | rough surface |
| C. | excessive shrinkage |
| D. | any of the above |
| Answer» E. | |
| 33. |
For grey cast iron the pouring temperature is |
| A. | 1400 to 1465?C |
| B. | 1455 to 1495?C |
| C. | 1250 to 1290?C |
| D. | 1510 to 1532?C |
| Answer» F. | |
| 34. |
Addition of saw dust to moulding sand increases its |
| A. | gas permeability |
| B. | refractoriness |
| C. | cohesiveness |
| D. | all of the above |
| Answer» B. refractoriness | |
| 35. |
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» B. copper and its alloys | |
| 36. |
The melting unit is an integral part of |
| A. | the cold chamber diecastings machine |
| B. | the hot chamber die casting machine |
| C. | both (A) and (B) above |
| Answer» C. both (A) and (B) above | |
| 37. |
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» E. | |
| 38. |
Heating of core is necessary while using which of the following core binder? |
| A. | Phenol formaldehyde resin |
| B. | Phenolic alcohols |
| C. | Furan-base binder |
| D. | All of the above |
| Answer» E. | |
| 39. |
When external features of the castings are important, which of the following method of casting is preferred? |
| A. | Die casting |
| B. | Slush casting |
| C. | Carbondioxide casting |
| D. | Dry sand casting |
| Answer» D. Dry sand casting | |
| 40. |
Wax patterns are used in |
| A. | non-ferrous castings |
| B. | investment casting process |
| C. | machine moulding process |
| D. | all of the above |
| Answer» C. machine moulding process | |
| 41. |
Rammer used for moulding the sand in large mould known as |
| A. | Hand rammer |
| B. | Peen rammer |
| C. | Floor rammer |
| Answer» F. | |
| 42. |
Pneumatic tools find application in foundries normally for |
| A. | fin removal |
| B. | surface finish |
| C. | filling of cavities |
| D. | none of the above |
| Answer» B. surface finish | |
| 43. |
While selecting wood for patterns, one should |
| A. | discard the rot |
| B. | discard the seasoned wood |
| C. | select the fresthy filled wood |
| D. | select the cross-grained woods |
| Answer» B. discard the seasoned wood | |
| 44. |
Sweep patterns are used to prepare mould of |
| A. | symmetrical and regular shapes |
| B. | unsymmetrical and regular shapes |
| C. | unsymmetrical and irregular shapes |
| D. | none of the above |
| Answer» B. unsymmetrical and regular shapes | |
| 45. |
Refractories should have all the following properties EXCEPT |
| A. | Long life |
| B. | Heat insulation |
| C. | High electrical conductivity |
| D. | Minimum contraction and expansion due to temperature variations |
| Answer» E. | |
| 46. |
Oil used for core sand is |
| A. | molasses |
| B. | linseed oil |
| C. | mineral oil |
| D. | any of the above |
| Answer» E. | |
| 47. |
Which of the following statement about core is incorrect? |
| A. | core should be capable of collapsing after the molten metal has solidified around it |
| B. | core should produce maximum amount of gas when in contact with molten metal |
| C. | core should be capable of collapsing shortly after the molten metal has solidified around it |
| D. | core should be permeable to escape of core gases |
| Answer» D. core should be permeable to escape of core gases | |
| 48. |
All of the following operations on castings are carried out for surface appearance improvement EXCEPT |
| A. | Galvanising |
| B. | Chilling |
| C. | Electroplating |
| D. | Enamelling |
| Answer» C. Electroplating | |
| 49. |
A spoke shave is a |
| A. | planing tool |
| B. | sawing tool |
| C. | boring tool |
| D. | layout tool |
| Answer» B. sawing tool | |
| 50. |
For aluminium alloys grain refinement can be achieved using |
| A. | titanium |
| B. | boron |
| C. | zirconium |
| D. | any of the above |
| Answer» E. | |