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101. |
Shell patterns are often used for |
A. | pipe work |
B. | bends |
C. | drainage fittings |
D. | all of the above |
Answer» D. all of the above |
102. |
In carbondioxide moulding the pressure of carbondioxide is around |
B. | 500 kg/cm2 |
C. | 1.5 kg/cm2 |
D. | 15 kg/cm2 |
E. | 150 kg/cm2 |
Answer» C. 1.5 kg/cm2 |
103. |
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 |
E. | smaller grain size |
Answer» A. larger grain size |
104. |
Which of the following cast iron is resistant to attack by sea water? |
B. | Low nickel cast iron |
C. | Low sulphur cost iron |
D. | Low chromium cast iron |
E. | Low phosphorous cast iron |
Answer» D. Low chromium cast iron |
105. |
Shaving of die casted parts is the process of removal of |
A. | sprue |
B. | flash |
C. | runner |
D. | none of the above |
Answer» B. flash |
106. |
The lower portion of the moulding flasks are known as |
A. | Cheek |
C. | Cope |
E. | Drag |
Answer» E. Drag |
107. |
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» A. improve strength |
108. |
A pit furnace can be used for the melting of |
A. | cast iron |
B. | brass |
C. | aluminium |
D. | all of the above |
Answer» D. all of the above |
109. |
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» D. All of the above |
110. |
Metal moulds are used in all of the following EXCEPT |
A. | Investment casting |
B. | Permanent mould casting |
D. | Centrifugal casting |
E. | Die casting process |
Answer» A. Investment casting |
111. |
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» D. all of the above |
112. |
Alloy containing 70% nickel and 30% copper is known as |
A. | hastalloy |
C. | permalloy |
D. | monel metal |
E. | N-c alloy |
Answer» D. monel metal |
113. |
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» B. It is expensive to use electricity for melting of cast iron |
114. |
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» C. Wrought iron |
115. |
The solidification shrinkage of magnesium alloys is about |
A. | 4 percent |
B. | 1 percent |
D. | 0.1 percent |
E. | 14 percent |
Answer» A. 4 percent |
116. |
The drawback with metallic pattern is |
A. | excessive weight |
B. | expensive |
C. | difficult to shape |
D. | all of the above |
Answer» D. all of the above |
117. |
Which of the following is a screen? |
A. | Shovel |
C. | Slick |
D. | Riddle |
E. | Rearner |
Answer» D. Riddle |
118. |
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» B. Adhesiveness |
119. |
A cupola one metre in diameter and 4 metres in height will melt in one hour about |
B. | 0.5 tonnes of iron |
C. | 10 tonnes of iron |
D. | 5 tonnes of iron |
E. | 2 tonnes of iron |
Answer» E. 2 tonnes of iron |
120. |
Pure iron melts at 1500?C. Presence of carbon |
A. | does not change the melting point |
B. | reduces the melting point |
D. | increases the melting point |
Answer» B. reduces the melting point |
121. |
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» C. plate moulding |
122. |
A blind riser can be located |
A. | in cheek only |
B. | in either cope or drag |
C. | in drag |
D. | in cope |
Answer» B. in either cope or drag |
123. |
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» D. all of the above |
124. |
A blast furnace operates continuously for |
A. | weeks together |
B. | days together |
D. | hours together |
E. | months together |
Answer» E. months together |
125. |
When external features of the castings are important, which of the following method of casting is preferred? |
B. | Die casting |
C. | Slush casting |
D. | Carbondioxide casting |
E. | Dry sand casting |
Answer» C. Slush casting |
126. |
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» D. all of the above |
127. |
Addition of saw dust to moulding sand increases its |
A. | gas permeability |
B. | refractoriness |
C. | cohesiveness |
D. | all of the above |
Answer» A. gas permeability |
128. |
Swab is used for |
A. | applying water to the mould around the edge of the pattern |
B. | shaking pattern to facilitate its with drawl from the mould |
C. | repairing and finishing of mould |
D. | none of the above |
Answer» A. applying water to the mould around the edge of the pattern |
129. |
For annealing of aluminium it is heated to |
A. | 625?C |
B. | 325?C |
D. | 525?C |
E. | 425?C |
Answer» B. 325?C |
130. |
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» D. all of the above |
131. |
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» A. machining of castings |
132. |
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» B. the hot chamber die casting machine |
133. |
Refractories should have all the following properties EXCEPT |
A. | Long life |
B. | Heat insulation |
D. | High electrical conductivity |
E. | Minimum contraction and expansion due to temperature variations |
Answer» D. High electrical conductivity |
134. |
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» D. All of the above |
135. |
Which of the following metals has the lowest melting point? |
A. | Magnesium |
B. | Aluminium |
C. | Silver |
E. | Brass |
Answer» A. Magnesium |
136. |
Which of the following statement about core is incorrect? |
B. | core should be capable of collapsing after the molten metal has solidified around it |
C. | core should produce maximum amount of gas when in contact with molten metal |
D. | core should be capable of collapsing shortly after the molten metal has solidified around it |
E. | core should be permeable to escape of core gases |
Answer» C. core should produce maximum amount of gas when in contact with molten metal |
137. |
Rammer used for moulding the sand in large mould known as |
A. | Hand rammer |
B. | Peen rammer |
E. | Floor rammer |
Answer» E. Floor rammer |
138. |
All of the following operations on castings are carried out for surface appearance improvement EXCEPT |
A. | Galvanising |
B. | Chilling |
D. | Electroplating |
E. | Enamelling |
Answer» B. Chilling |
139. |
Wax patterns are used in |
A. | non-ferrous castings |
B. | investment casting process |
C. | machine moulding process |
D. | all of the above |
Answer» B. investment casting process |
140. |
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 |
E. | charcoal |
Answer» E. charcoal |
141. |
While selecting wood for patterns, one should |
A. | discard the rot |
B. | discard the seasoned wood |
C. | select the fresthy filled wood |
E. | select the cross-grained woods |
Answer» A. discard the rot |
142. |
A spoke shave is a |
A. | planing tool |
B. | sawing tool |
C. | boring tool |
E. | layout tool |
Answer» A. planing tool |
143. |
Oil used for core sand is |
A. | molasses |
B. | linseed oil |
C. | mineral oil |
D. | any of the above |
Answer» D. any of the above |
144. |
The percentage of sulphur in pig iron is generally |
A. | 0.8% to 0.9% |
C. | 0.01% to 0.3% |
D. | 0.3% to 0.55% |
E. | 0.6% to 0.79% |
Answer» C. 0.01% to 0.3% |
145. |
Solidification time for riser should be |
A. | less than that of the casting |
D. | same as that for the casting |
E. | more than that of the casting |
Answer» E. more than that of the casting |
146. |
Which of the following is very powerful carbide former in cast iron? |
A. | Chromium |
B. | Nickel |
D. | Vanadium |
E. | Silicon |
Answer» D. Vanadium |
147. |
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» A. symmetrical and regular shapes |
148. |
For aluminium alloys grain refinement can be achieved using |
A. | titanium |
B. | boron |
C. | zirconium |
D. | any of the above |
Answer» D. any of the above |
149. |
Pneumatic tools find application in foundries normally for |
A. | fin removal |
B. | surface finish |
C. | filling of cavities |
D. | none of the above |
Answer» A. fin removal |
150. |
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» D. none of the above |
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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