McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Mechanical Engineering .
| 151. |
As the moisture content of sand increases |
| B. | permeability remains unchanged |
| D. | permeability decreases |
| E. | permeability increases |
| Answer» D. permeability decreases | |
| 152. |
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» D. all of the above | |
| 153. |
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» C. Gas holes | |
| 154. |
Which wood can be used for making patterns? |
| A. | Mathogany |
| B. | Pine wood |
| C. | Teak wood |
| D. | any of the above |
| Answer» D. any of the above | |
| 155. |
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 |
| E. | decreases as the section thickness of casting increases |
| Answer» E. decreases as the section thickness of casting increases | |
| 156. |
Contraction allowance for grey cast iron is (in mm/m) |
| A. | 21 |
| C. | 30 |
| E. | 10.5 |
| Answer» E. 10.5 | |
| 157. |
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» A. gypsum plaster | |
| 158. |
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» C. Defect free and castings with good surface is obtained | |
| 159. |
Melting point of copper |
| A. | 1444?C |
| C. | 1576?C |
| D. | 665?C |
| E. | 1083?C |
| Answer» E. 1083?C | |
| 160. |
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» D. any of the above | |
| 161. |
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» B. pressed casting | |
| 162. |
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» B. sodium carbonate with lime stone | |
| 163. |
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» A. excess of clay | |
| 164. |
Moisture content of the moulding sand is commonly |
| A. | 5% - 15% |
| B. | 1% - 4% |
| C. | 2% - 8% |
| Answer» C. 2% - 8% | |
| 165. |
Electric furnaces can usually operate upto a temperature of |
| A. | 1250?C |
| B. | 1700?C |
| C. | 2200?C |
| D. | 1000?C |
| Answer» B. 1700?C | |
| 166. |
Inoculants are added to aluminium mainly for |
| A. | grain refinement |
| B. | directional solidification |
| C. | purification |
| D. | all of the above |
| Answer» A. grain refinement | |
| 167. |
Permanent mould casting is also known as |
| A. | chill casting |
| B. | short casting |
| C. | gravity die casting |
| D. | slush casting |
| Answer» C. gravity die casting | |
| 168. |
In investment casting the pattern is made of |
| A. | wood |
| B. | urea formaldehyde |
| C. | wax |
| D. | none of the above |
| Answer» C. wax | |
| 169. |
Consumable patterns are made of |
| A. | polystyrene |
| B. | wax |
| C. | plaster of paris |
| D. | any of the above |
| Answer» A. polystyrene | |
| 170. |
The function of riser is |
| A. | to allow the heat of molten metal to dissipate to atmosphere |
| C. | to provide an opening through which molten metal is poured |
| D. | to give an indication that mould is filled |
| E. | to supply molten metal to casting as it tends to contract during solidification |
| Answer» E. to supply molten metal to casting as it tends to contract during solidification | |
| 171. |
According to Chvorinov's equation, the solidification time of castings is |
| A. | Directly proportional to square of the volume of the casting |
| C. | inversely proportional to the volume the casting |
| D. | inversely proportional to square of the volume of the casting |
| E. | directly proportional to the volume of the castings |
| Answer» A. Directly proportional to square of the volume of the casting | |
| 172. |
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» D. any of the above | |
| 173. |
Graphitic cast iron is |
| A. | hard |
| C. | non-machinable |
| D. | low in damping capacity |
| E. | high in compressive strength |
| Answer» E. high in compressive strength | |
| 174. |
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» D. any of the above | |
| 175. |
Investment casting is also known as |
| A. | lost wax casting |
| B. | lost pattern casting |
| C. | hot investment casting |
| D. | any of the above |
| Answer» D. any of the above | |
| 176. |
Which of the following is core hardening process? |
| A. | CO2 process |
| B. | Cold set process |
| C. | Furan system |
| D. | All of the above |
| Answer» D. All of the above | |
| 177. |
Blow holes in castings are due to |
| A. | high moisture content of the sand |
| B. | low permeability of sand |
| C. | excessive fine grains and gas producing ingredients |
| D. | any of the above |
| Answer» D. any of the above | |
| 178. |
When wooden patterns with metallic coating are to be used, the metal sprayed on wooden pattern could be |
| A. | bismuth |
| B. | zinc |
| C. | aluminium |
| D. | any of the above |
| Answer» D. any of the above | |
| 179. |
Shell moulding can be used for |
| A. | producing thin castings |
| B. | better surface finish |
| C. | tolerances of the order of 0.002 mm per mm |
| D. | all of the above |
| Answer» D. all of the above | |
| 180. |
In case of carbondioxide moulding, the binder used is generally |
| B. | coal dust |
| C. | graphite |
| D. | sodium silicate |
| E. | china clay |
| Answer» D. sodium silicate | |
| 181. |
Aluminium castings are not repaired by |
| A. | inert gas metal arc welding |
| B. | braze welding |
| C. | soldering |
| D. | All of the above |
| Answer» B. braze welding | |
| 182. |
First step in reclaiming the moulding and core sand is |
| A. | addition of moisture |
| B. | reproportioning of binder |
| C. | separation of metal particles |
| D. | any of the above |
| Answer» C. separation of metal particles | |
| 183. |
If ash content of coke used in cupola is high then |
| A. | melting rate will be low |
| B. | castings produced will have blow holes |
| C. | more of flux will be required |
| D. | carbon content of castings will be low |
| Answer» C. more of flux will be required | |
| 184. |
Non-uniform distribution of alloying components, inclusions and impurities in an ingot or casting are known as |
| A. | ageing |
| B. | bleeding |
| C. | innoculation |
| E. | segregation |
| Answer» E. segregation | |
| 185. |
Clay used for foundry sand should be |
| A. | kaolinite |
| B. | montmorillonite |
| C. | illite |
| D. | any of the above |
| Answer» D. any of the above | |
| 186. |
Phenolic thermo-setting plastics are finding application in pattern making because |
| A. | they do not absorb moisture |
| B. | they are resistant to wear |
| D. | they have all above qualities |
| E. | they are strong |
| Answer» D. they have all above qualities | |
| 187. |
The location of riser least depends on |
| A. | the size of core |
| C. | feasibility of directional solidification |
| D. | the metal to be cast |
| E. | design of casting |
| Answer» A. the size of core | |
| 188. |
In case of cast steel, the contraction allowance will be least for castings having dimensions |
| B. | upto 600 mm |
| C. | 1000 mm to 1800 mm |
| D. | 600 to 1000 mm |
| E. | above 1800 mm |
| Answer» E. above 1800 mm | |
| 189. |
The "Green sand" is termed so, because |
| A. | it is green in colour |
| B. | it contains moisture |
| C. | none of the above |
| Answer» B. it contains moisture | |
| 190. |
A designer would attempt to avoid bosses and pads in the casting because |
| A. | projections such as bosses and pads can not merge with thinner sections |
| B. | it is difficult to incorporate in pattern |
| C. | they being thicker will take longer to solidify and hence will suffer from residual stresses and coarse grains |
| D. | mould formation is difficult in pressence of boss |
| Answer» C. they being thicker will take longer to solidify and hence will suffer from residual stresses and coarse grains | |
| 191. |
Padding is |
| A. | a method for production of chilled castings |
| B. | an extra support for thin castings |
| C. | an extra metal added to the original uniform section of the casting |
| D. | none of the above |
| Answer» C. an extra metal added to the original uniform section of the casting | |
| 192. |
In case of cored aluminium castings, the contraction allowance is |
| A. | more than the normal allowance |
| C. | less than the normal allowance |
| E. | same as the normal allowance |
| Answer» C. less than the normal allowance | |
| 193. |
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» C. corrosion protection | |
| 194. |
Head storage capacity of moulding sand can be increased by adding? |
| A. | graphite |
| B. | chromite |
| C. | magnesium powder |
| D. | any of the above |
| Answer» B. chromite | |
| 195. |
Sand grains which give high mould strength are |
| A. | Sub-angular grains |
| B. | Rounded grains |
| D. | Sharp or Angular grains |
| Answer» D. Sharp or Angular grains | |
| 196. |
Oil fired furnaces are generally used for the melting of |
| A. | alloy steel |
| B. | cast steel |
| C. | cast iron |
| E. | non-ferrous metals |
| Answer» E. non-ferrous metals | |
| 197. |
Electric indirect are furnace is normally used for melting of |
| A. | alloy steels |
| B. | cast steels |
| C. | non-ferrous metals |
| D. | all of the above |
| Answer» C. non-ferrous metals | |
| 198. |
Wood used for pattern making has knots. This is likely to affect |
| A. | warping of the piece |
| B. | machinability of pattern |
| C. | moisture content of wood |
| D. | all of the above |
| Answer» D. all of the above | |
| 199. |
As a result of melting of cast iron in cupola, which of the following constituent undergoes least change in its percentage? |
| B. | Manganese |
| C. | Phosphorous |
| D. | Silicon |
| E. | Sulphur |
| Answer» C. Phosphorous | |
| 200. |
Investment casting can be used for which of the following alloys |
| A. | cobalt based satellite |
| B. | Tool steels |
| C. | Hynes super alloys |
| D. | All of the above |
| Answer» D. All of the above | |
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