MCQOPTIONS
Saved Bookmarks
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. |
The percentage of sulphur in pig iron is generally |
| A. | 0.8% to 0.9% |
| B. | 0.01% to 0.3% |
| C. | 0.3% to 0.55% |
| D. | 0.6% to 0.79% |
| Answer» D. 0.6% to 0.79% | |
| 2. |
Which of the following is very powerful carbide former in cast iron? |
| A. | Chromium |
| B. | Nickel |
| C. | Vanadium |
| D. | Silicon |
| Answer» E. | |
| 3. |
In copper alloy foundry which of the following is used to prevent the molten metal from being oxidized? |
| A. | phophorous |
| B. | bone ash |
| C. | calcium carbonate |
| D. | charcoal |
| Answer» F. | |
| 4. |
Which of the following operations improve wear resistance and mechanical properties of castings? |
| A. | Shot peening |
| B. | Chilling |
| C. | Nitriding |
| D. | All of the above |
| Answer» E. | |
| 5. |
The burnt on sand causes difficulty in |
| A. | machining of castings |
| B. | removal of castings from moulds |
| C. | separation of sand and castings after pouring |
| D. | all of the above |
| Answer» B. removal of castings from moulds | |
| 6. |
Die casting dies are generally made of |
| A. | aluminium alloys |
| B. | bronze |
| C. | cast iron |
| D. | alloy steels |
| Answer» F. | |
| 7. |
In case of consumable patterns |
| A. | labour charges are reduced |
| B. | core is not required |
| C. | moulds are unsplit |
| D. | all of the above |
| Answer» E. | |
| 8. |
For annealing of aluminium it is heated to |
| A. | 625?C |
| B. | 325?C |
| C. | 525?C |
| D. | 425?C |
| Answer» C. 525?C | |
| 9. |
Which of the following is used to increase refractoriness of sand? |
| A. | Graphite |
| B. | Silica flour |
| C. | Iron free zirconium |
| D. | all of the above |
| Answer» E. | |
| 10. |
For producing several similar parts from a single mould the moulding used is |
| A. | bench moulding |
| B. | floor moulding |
| C. | plate moulding |
| D. | none of the above |
| Answer» D. none of the above | |
| 11. |
A blind riser can be located |
| A. | in cheek only |
| B. | in either cope or drag |
| C. | in drag |
| D. | in cope |
| Answer» C. in drag | |
| 12. |
Shaving of die casted parts is the process of removal of |
| A. | sprue |
| B. | flash |
| C. | runner |
| D. | none of the above |
| Answer» C. runner | |
| 13. |
The disadvantage of hot blast cupola is |
| A. | low coke consumption |
| B. | reduced silicon loss |
| C. | reduced output silicon loss |
| D. | all of the above |
| Answer» E. | |
| 14. |
The solidification shrinkage of magnesium alloys is about |
| A. | 4 percent |
| B. | 1 percent |
| C. | 0.1 percent |
| D. | 14 percent |
| Answer» B. 1 percent | |
| 15. |
In carbondioxide moulding the pressure of carbondioxide is around |
| A. | 500 kg/cm2 |
| B. | 1.5 kg/cm2 |
| C. | 15 kg/cm2 |
| D. | 150 kg/cm2 |
| Answer» D. 150 kg/cm2 | |
| 16. |
A blast furnace operates continuously for |
| A. | weeks together |
| B. | days together |
| C. | hours together |
| D. | months together |
| Answer» F. | |
| 17. |
Which variety of cast iron can be forged? |
| A. | Grey cast iron |
| B. | High silicon cast iron |
| C. | Wrought iron |
| D. | All of the above |
| Answer» D. All of the above | |
| 18. |
Molybdenum upto 1.5% is added to cast iron to |
| A. | improve strength |
| B. | reduce wear resistance |
| C. | increase machinability |
| D. | all of the above |
| Answer» B. reduce wear resistance | |
| 19. |
Which of the following is a screen? |
| A. | Shovel |
| B. | Slick |
| C. | Riddle |
| D. | Rearner |
| Answer» E. | |
| 20. |
The lower portion of the moulding flasks are known as |
| A. | Cheek |
| B. | Cope |
| C. | Drag |
| Answer» F. | |
| 21. |
Shell patterns are often used for |
| A. | pipe work |
| B. | bends |
| C. | drainage fittings |
| D. | all of the above |
| Answer» E. | |
| 22. |
Use of flux in melting of magnesium |
| A. | separates out impurities |
| B. | prevents burning of magnesium alloys |
| C. | facilitates production of sound cstings |
| D. | all of the above |
| Answer» E. | |
| 23. |
Pure iron melts at 1500?C. Presence of carbon |
| A. | does not change the melting point |
| B. | reduces the melting point |
| C. | increases the melting point |
| Answer» C. increases the melting point | |
| 24. |
A cupola one metre in diameter and 4 metres in height will melt in one hour about |
| A. | 0.5 tonnes of iron |
| B. | 10 tonnes of iron |
| C. | 5 tonnes of iron |
| D. | 2 tonnes of iron |
| Answer» F. | |
| 25. |
Metal moulds are used in all of the following EXCEPT |
| A. | Investment casting |
| B. | Permanent mould casting |
| C. | Centrifugal casting |
| D. | Die casting process |
| Answer» B. Permanent mould casting | |
| 26. |
As compared to green sand in shell moulding cooling rate of cast metal is slow. Hence as compared to green sand castings, shell moulded castings will have |
| A. | larger grain size |
| B. | smaller grain size |
| Answer» B. smaller grain size | |
| 27. |
Generally for the melting of cast iron, electric furnaces are not used because |
| A. | cast iron is in the form of broken pieces |
| B. | It is expensive to use electricity for melting of cast iron |
| C. | the rate of heating required for melting cast iron connot be provided by electric furnaces |
| D. | cast iron requires higher temperature for heating |
| Answer» C. the rate of heating required for melting cast iron connot be provided by electric furnaces | |
| 28. |
The property of the foundry sand which enables it to adhere to the surface of other materials is termed |
| A. | Cohesiveness |
| B. | Adhesiveness |
| C. | Either of (A) or (B) |
| Answer» C. Either of (A) or (B) | |
| 29. |
A pit furnace can be used for the melting of |
| A. | cast iron |
| B. | brass |
| C. | aluminium |
| D. | all of the above |
| Answer» E. | |
| 30. |
Alloy containing 70% nickel and 30% copper is known as |
| A. | hastalloy |
| B. | permalloy |
| C. | monel metal |
| D. | N-c alloy |
| Answer» E. | |
| 31. |
The drawback with metallic pattern is |
| A. | excessive weight |
| B. | expensive |
| C. | difficult to shape |
| D. | all of the above |
| Answer» E. | |
| 32. |
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» E. | |
| 33. |
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» E. | |
| 34. |
Flux used in cupola while melting cast iron is |
| A. | lime stone |
| B. | coke slurry |
| C. | molasses |
| D. | any of the above |
| Answer» B. coke slurry | |
| 35. |
Hairlines in die casted materials result from |
| A. | chemical attack |
| B. | mechanical erosion |
| C. | thermal fatigue |
| D. | all of the above |
| Answer» D. all of the above | |
| 36. |
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» D. | |
| 37. |
Die casting is generally not used for |
| A. | cast iron |
| B. | zinc base alloys |
| C. | aluminium base alloys |
| D. | non-ferrous metals |
| Answer» B. zinc base alloys | |
| 38. |
The principal ingredients of moulding sands are |
| A. | silica sand, carbon, hydrocarbons and moisture |
| B. | silica sand, clay and water |
| C. | silica sand, dust and crabon |
| D. | silica sand, carbon and water |
| Answer» D. silica sand, carbon and water | |
| 39. |
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 |
| D. | drops |
| Answer» D. drops | |
| 40. |
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» E. | |
| 41. |
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» E. | |
| 42. |
On drying, wood |
| A. | expands |
| B. | shrinks |
| C. | changes colour |
| Answer» D. | |
| 43. |
Permeability of moulding sand is increased due to/by |
| A. | Hard ramming |
| B. | Soft ramming |
| C. | Clay |
| Answer» C. Clay | |
| 44. |
Which heat treatment is applicable to aluminium alloy castings? |
| A. | Stabilizing |
| B. | Solution heat treatment |
| C. | Artificial ageing |
| D. | all of the above |
| Answer» E. | |
| 45. |
The order of dimensional accuracy in die casting is nearly |
| A. | 4 percent |
| B. | 0.4 percent |
| C. | 0.04 percent |
| D. | 0.004 percent |
| Answer» D. 0.004 percent | |
| 46. |
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» C. it cools much slowly | |
| 47. |
The purpose of clay in a moulding sand is to |
| A. | Act as a binder in the mould |
| B. | Make the mould refractory |
| C. | Mak the mould permeable |
| Answer» B. Make the mould refractory | |
| 48. |
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» B. strong mould | |
| 49. |
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» C. Refractoriness | |
| 50. |
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» E. | |