McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Mechanical Engineering .
| 1. |
A pattern is generally made up of how many pieces? |
| A. | 1 |
| B. | 2-3 |
| C. | 4-5 |
| D. | 6 |
| Answer» B. 2-3 | |
| Explanation: a pattern is basically a duplicate of the object that we intend to cast. patterns can be made up of wood, plastics or metals. a pattern is generally made up of two or three pieces, whereas it is casting which is in one piece. | |
| 2. |
How does pattern vary in size with casting? |
| A. | pattern is larger in size |
| B. | casting is larger in size |
| C. | both have same size |
| D. | size depends on other factors |
| Answer» A. pattern is larger in size | |
| Explanation: patterns are duplicates of the objects we desire to cast. these patterns can be made up of plastics, metals or wood. a pattern is slightly larger in size as compared to casting because a pattern carries various allowances and the core prints. | |
| 3. |
A pattern carries which allowance for internal and external surfaces? |
| A. | shrinkage allowance |
| B. | machining allowance |
| C. | distortion allowance |
| D. | draft allowance |
| Answer» D. draft allowance | |
| Explanation: draft allowance is also known by the name of tapering allowance, as the diameter of the cast goes on increasing in a trapezoidal shape from the bottom. a pattern has a draft allowance of an order of 1 and 3 degrees for external and internal surfaces respectively. | |
| 4. |
What is draft allowance also known as? |
| A. | shake allowance |
| B. | contraction allowance |
| C. | taper allowance |
| D. | rapping allowance |
| Answer» C. taper allowance | |
| Explanation: none. | |
| 5. |
Machining allowance does not depend on which of the following factor? |
| A. | solidifying contraction |
| B. | machining method |
| C. | shape and size of casting |
| D. | casting method |
| Answer» A. solidifying contraction | |
| Explanation: machining allowance does not depend on solidifying contraction as it is one of the form of shrinkage allowance. but, | |
| 6. |
How much does the distortion allowance vary? |
| A. | 1mm to 10mm |
| B. | 2mm to 20mm |
| C. | 1mm to 15mm |
| D. | 2mm to 15mm |
| Answer» B. 2mm to 20mm | |
| Explanation: in distortion allowance, the amount goes on to vary from 2mm to 20mm. this allowance depends on the shape of the casting that is being used. it also depends on the size of the cast and the material that is being employed for the casting. | |
| 7. |
Ferrous metals need more allowance than non-ferrous metals. |
| A. | true |
| B. | false |
| Answer» A. true | |
| Explanation: ferrous metals have dimensions on casting which have a larger size to provide stock than the dimensions of the casting of the non-ferrous metals. | |
| 8. |
A pattern is shaken by striking it with a wooden piece. A negative allowance is provided for this. Which allowance is it? |
| A. | machining allowance |
| B. | rapping allowance |
| C. | distortion allowance |
| D. | contraction allowance |
| Answer» B. rapping allowance | |
| Explanation: in rapping or shake allowance, the pattern is taken out of the mould and it is rapped or shaken, so as to free it from the adjoining sand. due to this, there may be a little increase in the size of the mould cavity. | |
| 9. |
The following figure depicts which allowance? |
| A. | machining allowance |
| B. | shrinkage allowance |
| C. | draft allowance |
| D. | shake allowance |
| Answer» C. draft allowance | |
| Explanation: the pattern is being taken out of the mould without the mould cavity getting damaged. the pattern is having a tapered shape, that is, it has a tapering allowance. | |
| 10. |
Which of the following is not used for the formation of the molding sand? |
| A. | silica sand |
| B. | binders |
| C. | additives |
| D. | coal |
| Answer» D. coal | |
| Explanation: the coal is a material which is not used in the formation of the molding sand as the particle size of the coal is high and there are chances that it will react with the possible gases that are produced during the pouring of the metal and result in casting defects. | |
| 11. |
The is responsible for the impact strength in the molding sand. |
| A. | aggregates |
| B. | refractoriness |
| C. | impurities |
| D. | permeability |
| Answer» A. aggregates | |
| Explanation: in a foundry, the molding sand | |
| 12. |
Molding sand can withstand chemical reactions on it and prove it to be beneficial for the casting formation. |
| A. | true |
| B. | false |
| Answer» B. false | |
| Explanation: molding sand is added with chemicals to enhance properties such as permeability, compressive strength etc., however, the chemical reactions happening is not viable for the formation of the casting as it might cause explosion or severe fatal effects in the casting. | |
| 13. |
The property ensures the removal of excess sand in the mould box. |
| A. | adhesiveness |
| B. | cohesiveness |
| C. | green strength |
| D. | compressive strength |
| Answer» A. adhesiveness | |
| Explanation: the adhesiveness is a property of molding sand to get the stick or adhere to foreign material such as sticking of molding sand with an inner wall of the molding box. hence, as the sand sticks to the box and the excess sand is removed. | |
| 14. |
Binding property of the sand increases because of the property. |
| A. | cohesiveness |
| B. | collapsibility |
| C. | flow ability |
| D. | permeability |
| Answer» A. cohesiveness | |
| Explanation: the cohesiveness is a property of molding sand by virtue which the sand grain particles interact and attract each other | |
| 15. |
The adhesiveness and cohesiveness are the same properties of the molding sand. |
| A. | true |
| B. | false |
| Answer» B. false | |
| Explanation: the adhesive property refers to the sticking of the sand particles to each other so that they can take up the desired shape. | |
| 16. |
Flow ability increases with increase in the green strength. |
| A. | true |
| B. | false |
| Answer» A. true | |
| Explanation: flowability or plasticity is the ability of the sand to get compacted and behave like a fluid. it will flow uniformly to | |
| 17. |
For melting of cast iron, which of the following furnace is used? |
| A. | rotary furnace |
| B. | cupola furnace |
| C. | pit furnace |
| D. | electric furnace |
| Answer» B. cupola furnace | |
| Explanation: cupola is a heavy furnace and has the capability to melt down heavy metals like cast iron. hence, the cupola furnace is mostly used to melt cast iron for casting purposes. | |
| 18. |
Why is sand bed prepared for melting of metal in Cupola furnace? |
| A. | it provides a refractory bottom |
| B. | it soaks the moisture from the metal |
| C. | it conducts the heat faster and uniformly |
| D. | none of the mentioned |
| Answer» A. it provides a refractory bottom | |
| Explanation: a sand bed needs to be prepared because it provides a necessary refractory bottom for molten metal and coke. | |
| 19. |
What is the function of slag hole in a cupola furnace? |
| A. | to tap the slag generated |
| B. | to generate the slag |
| C. | to allow outflow of gases |
| D. | all of the mentioned |
| Answer» A. to tap the slag generated | |
| Explanation: slag hole is a tapping hole in a | |
| 20. |
Incoming air pressure and quantity in cupola furnace are controlled by which of the following element? |
| A. | tuyeres |
| B. | tapping spout |
| C. | wind box |
| D. | blast pipe |
| Answer» C. wind box | |
| Explanation: the air enters the cupola through the tuyers. but the air blowers in the wind box controls the requisite pressure and quantity of air coming inside. | |
| 21. |
Which of the following chemical compound, is the most common flux added to the charge in a cupola furnace? |
| A. | coke |
| B. | methane |
| C. | carbon dioxide |
| D. | limestone |
| Answer» D. limestone | |
| Explanation: limestone (caco3) is used as flux in cupola furnace in a proportion of about 2-4% of the metal charge. | |
| 22. |
Which of the following metal has a melting point of about 1537oC and latent heat of fusion 65.0 cal/g? |
| A. | nickel |
| B. | copper |
| C. | zinc |
| D. | iron |
| Answer» D. iron | |
| Explanation: iron is the metal having a melting point of about 1537oc and latent heat of fusion of 65.0 cal/g. it has a mean specific heat of 0.141 cal/g-oc and heat required for melting 1 kg of iron is 1168 kj. | |
| 23. |
What is hearth in a furnace? |
| A. | the electrodes are often called hearth |
| B. | the walls of the furnace |
| C. | the bowl shaped bottom of the furnace |
| D. | the dome shaped roof of the furnace |
| Answer» C. the bowl shaped bottom of the furnace | |
| Explanation: the hearth is that bowl shaped bottom of the furnace. it is made up of a high refractory material (bricked and granular). | |
| 24. |
Why are flux added to the charge ( parent metal to be melted) during melting of a metal? |
| A. | to increase carbon content |
| B. | to increase refractoriness |
| C. | to add specific oxides |
| D. | to remove specific oxides |
| Answer» D. to remove specific oxides | |
| Explanation: the flux is a chemical substance, added to the metal while melting it to remove oxides present in the metal. | |
| 25. |
Which of the following is/are the advantage(s) of an Induction Furnace? |
| A. | higher yield |
| B. | cleaner melting |
| C. | compact installation |
| D. | all of the mentioned |
| Answer» D. all of the mentioned | |
| Explanation: advantages offered by induction furnace are higher yield, faster startup, cleaner melting, natural stirring and compact installation. | |
| 26. |
Which of the following metal has a melting point of about 420oC and latent heat of fusion 26.3 cal/g? |
| A. | nickel |
| B. | copper |
| C. | zinc |
| D. | iron |
| Answer» C. zinc | |
| Explanation: zinc is the metal having a melting point of about 420oc and latent heat of fusion of 26.3 cal/g. it has a mean specific heat of 0.101 cal/goc and heat required for melting 1 kg of zinc is 285 kj. | |
| 27. |
Which of the following metal has a melting point of about 660oC and latent heat of fusion 92.7 cal/g? |
| A. | aluminium |
| B. | lead |
| C. | magnesium |
| D. | tin |
| Answer» A. aluminium | |
| Explanation: iron is the metal having a melting point of about 660oc and latent heat of fusion of 92.7 cal/g. it has a mean specific heat of 0.237 cal/goc and heat required for melting 1 kg of iron is 1022 kj. | |
| 28. |
Gas-Fired burner is used in which of the following furnace? |
| A. | induction furnace |
| B. | reverberatory furnace |
| C. | cupola furnace |
| D. | crucible furnace |
| Answer» B. reverberatory furnace | |
| Explanation: reverberatory furnace use gas- fired burner, located higher in the furnace transferring heat by radiation to the wall and roof. | |
| 29. |
What is inoculation of cast iron? |
| A. | addition of sulphur alloys |
| B. | addition of silicon alloys |
| C. | addition of oxides |
| D. | addition of parent metal’s ore |
| Answer» B. addition of silicon alloys | |
| Explanation: inoculation of cast iron is the addition of certain silicon alloys to molten iron to produce changes in graphite distribution. | |
| 30. |
Why is inoculation done certain times during melting of cast iron? |
| A. | to enhance its mechanical properties |
| B. | to reduce the liquid shrinkage of metal |
| C. | to enhance the surface finishing |
| D. | all of the mentioned |
| Answer» A. to enhance its mechanical properties | |
| Explanation: a certain amount of silicon alloys are added to the molten metal to | |
| 31. |
Which of the following is/are not used to melt material in casting(foundry) industries? |
| A. | cupola furnace |
| B. | induction furnace |
| C. | ladle furnace |
| D. | crucible furnace |
| Answer» C. ladle furnace | |
| Explanation: all of listed are the furnaces used by metal foundry industries to melt down metal for casting purposes, except ladle furnace. | |
| 32. |
Which type of sand is used in shell moulding? |
| A. | black sand |
| B. | wet and fine sand |
| C. | dry and fine sand |
| D. | any of the sand |
| Answer» C. dry and fine sand | |
| Explanation: dry and fine sans is used in shell moulding. it is completely free if clay (90-140 gfn). | |
| 33. |
Which is the most widely used resin in shell moulding? |
| A. | phenol formaldehyde |
| B. | ethanol formaldehyde |
| C. | phenol |
| D. | ethanol |
| Answer» A. phenol formaldehyde | |
| Explanation: phenol formaldehyde is used as resin in shell moulding. it acts like a thermoplastic material. | |
| 34. |
Which of the following statement is true? |
| A. | the size of the casting can be adjustable |
| B. | the size of the casting is not limited |
| C. | the size of the casting obtained by shell moulding is limited |
| D. | none of the mentioned |
| Answer» C. the size of the casting obtained by shell moulding is limited | |
| Explanation: the size of the casting is limited and is usually up to 200kg. | |
| 35. |
Cylinder and cylinder heads for air cooled IC engines are casted using which technique? |
| A. | precision investment casting |
| B. | shell moulding |
| C. | permanent mould casting |
| D. | die casting |
| Answer» B. shell moulding | |
| Explanation: cylinders, cylinder head, automation parts, cast tooth etc are casted using shell moulding. | |
| 36. |
In precision investment casting, to make the mould the prepared pattern is dipped into a slurry. From which material is this slurry is made up of? |
| A. | ethyl silicate |
| B. | sodium silicate |
| C. | both ethyl and sodium silicate |
| D. | neither ethyl nor sodium silicate |
| Answer» C. both ethyl and sodium silicate | |
| Explanation: the slurry in which prepared pattern is dipped into is made by suspending fine ceramic particles in ethyl silicate or sodium silicate. | |
| 37. |
Another name of Gravity Die Casting is? |
| A. | centrifugal casting |
| B. | permanent mould casting |
| C. | precision investment casting |
| D. | hot chamber process |
| Answer» B. permanent mould casting | |
| Explanation: since, metal enters the mould under gravity, hence permanent, mould casting is also known as gravity die casting. | |
| 38. |
In PIC, any wax remnants are dissolved with the help of hot vapors of a solvent. Which solvent is used for this purpose? |
| A. | ethanol |
| B. | chlorofluorocarbon |
| C. | trichloroethylene |
| D. | any of the above |
| Answer» C. trichloroethylene | |
| Explanation: before preheating of the prepared mould, any of the wax remnants are dissolved with the help of a solvent such as trichloroethylene. | |
| 39. |
Which of the following is a limitation of die casting, but is overcome in vacuum die casting? |
| A. | the air left in the cavity when the die is closed |
| B. | the moisture left in the cavity when the die is closed |
| C. | the air left in the cavity when the die is open |
| D. | the moisture left in the cavity when the die is open |
| Answer» A. the air left in the cavity when the die is closed | |
| Explanation: in die casting the major problem is the air left inside the cavity when the die is closed, but in the case of vacuum die casting this air is evacuated out. | |
| 40. |
Pattern used in shell moulding is normally made up of? |
| A. | wax |
| B. | metal |
| C. | wood |
| D. | plastic |
| Answer» B. metal | |
| Explanation: metal is the most used material to make patterns for a process of shell moulding. | |
| 41. |
The casting process that does not require a core to produce a hollow casting is? |
| A. | shell moulding |
| B. | hot-chamber die casting |
| C. | permanent mould casting |
| D. | true centrifugal casting |
| Answer» C. permanent mould casting | |
| Explanation: permanent mould casting is the only process that does not require cores to be used for hollow projections. | |
| 42. |
Squeeze casting method was developed in which country? |
| A. | japan |
| B. | india |
| C. | america |
| D. | russia |
| Answer» D. russia | |
| Explanation: russia was the country in which squeeze casting was first developed. | |
| 43. |
The tundish is a |
| A. | pouring vessel |
| B. | riser |
| C. | type of core |
| D. | machine name |
| Answer» A. pouring vessel | |
| Explanation: tundish is a refractory lined intermediate pouring vessel. | |
| 44. |
Which of the type of centrifugal casting methods is used to produce ‘non- symmetrical’ shaped castings? |
| A. | true centrifugal casting |
| B. | semi centrifugal casting |
| C. | centrifuging |
| D. | non centrifugal casting |
| Answer» C. centrifuging | |
| Explanation: more than a single object is connected radially through a central sprue in centrifuging. but the castings need not be symmetrical always, unlike other centrifugal casting processes. | |
| 45. |
True centrifugal casting method is usually used to make |
| A. | bent pipes |
| B. | hollow pipes |
| C. | bolts |
| D. | nuts |
| Answer» B. hollow pipes | |
| Explanation: true centrifugal casting method is usually used to make ‘hollow pipes and tubes’. | |
| 46. |
Which of the following forces provides continuous pressure on the metal in centrifugal casting? |
| A. | spring force |
| B. | centrifugal force |
| C. | gravitational force |
| D. | frictional force |
| Answer» B. centrifugal force | |
| Explanation: in centrifugal casting, mould is rotated rapidly about its central axis as the metal is poured into it. because of the centrifugal force, continuous pressure is applied to the metal as it solidifies. the slag and the other inclusions being lighter gets separated from the metal and segregates toward the centre. | |
| 47. |
Which of the following methods of casting is best suited for casting of hollow pipes and tubes? |
| A. | investment casting |
| B. | permanent mould casting |
| C. | die casting |
| D. | centrifugal casting |
| Answer» D. centrifugal casting | |
| Explanation: specifically, true centrifugal casting is generally used for the making of hollow pipes and tubes, which are axi- symmetric with a concentric hole. molten metal is accumulated at the inward surface of the mould by the rotation of the mould and then the solidification of a melt is taking place. | |
| 48. |
5 CENTRIFUGAL CASTING |
| A. | true |
| B. | false |
| Answer» B. false | |
| Explanation: in centrifugal casting, there is no requirement of any core for the making of the concentric hole. as the metal is always pushed outward because of the centrifugal force, application of core is eliminated. only the oxides and slag part separate from the metal and segregate at the centre. | |
| 49. |
The axis of rotation of the mould should be horizontal for the casting of long pipes in centrifugal casting. |
| A. | true |
| B. | false |
| Answer» A. true | |
| Explanation: in centrifugal casting, the axis of rotation of the mould can be horizontal, vertical or any angle in between. generally, very long pipes are cast with a horizontal axis, whereas short pieces are more conveniently cast with a vertical axis, as it requires less area for the casting operation. | |
| 50. |
In centrifugal casting, only sand moulds can be used due to the problem of sticking of metal. |
| A. | true |
| B. | false |
| Answer» B. false | |
| Explanation: not only sand moulds, the metallic moulds can also be used in the centrifugal casting process for large scale production. as inducing of high temperature of metallic mould can be avoided by water circulation through it and sticking problem can also be solved by casting of non-sticking materials. | |
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