Marks 1
In carbon dioxide molding process, the binder used is
Match the items in the first column to their functions in the second column.
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Chills are used in casting moulds to
A cube shaped casting solidifies in $$5$$ min. The solidification time in min for a cube of the same material, which is $$8$$ times heavier than the o...
In sand casting fluidity of the molten metal increases with
Which of the following casting processes uses expandable pattern and expandable mold
Solidification time of a metallic alloy casting is
Hot chamber die casting is NOT suited for
In hollow cylindrical parts made by centrifugal casting, the density of the part is
Cold shut is a defect in casting due to
An expandable pattern is used in
Wood flour is added to core sand to improve:
Which one of the following is NOT a property of a sand mold?
Shell molding is an investment casting process $$(T/F)$$
Bentonite is commonly used bonding material for dry sand cores
Investment casting uses ......... (wax / resin coated sand) as pattern material and is preferred for small parts with ................. (simple/intric...
The primary function of a riser is to
Increase in carbon content in plain carbon steels raise its
Investment casting uses ...... A........... as pattern material and is preferred for small parts with .......... B.........designs.
A. wax / resin co...
Chaplets are placed between mold in order to
The optimum pouring time for a casting depends on several factors. One important factor among them is
Ceramic slurry is used in making the molds for
Pressure die casting deals with casting metals of relatively ............. A ............. melting point and provides ........ B.......... production ...
Low permeability molds and low pouring temperature of the molten metal causes ......................... defect in castings.
For casting of turbine blades made of high temp and high strength alloys, the most suitable process is
The problem of shrinkage cavity is more likely to occur while casting ......... A ............ B.......... a chill block
(A.) metal / plastic , (B.) w...
Negative allowance is provided on the pattern to take care of
For the same material, powder metallurgy process is superior to casting for
Poor collapsibility of the mold leads to .......... type of casting defect in aluminium castings.
The process by which shell like castings (like toys) are made is
Green strength in powder metallurgy refers to the strength of
Marks 2
Schematic diagram of pouring basin and sprue of a gating system is shown in the Figure. Depth of molten metal in the pouring basin is $$100$$ $$mm$$ a...
Two cast iron blocks $$P$$ and $$Q,$$ each of $$500$$ $$mm$$ length, have the same cross-sectional area. Block $$P$$ has rectangular cross-section of ...
In a metal casting process, molten copper alloy is poured into a sand mould. The level of molten metal in the pouring basin is at a height of $$300$$ ...
For a given volume of a riser, if the solidification time of the molten metal in riser needs to be quadrupled, the surface area of the riser should be...
A mold having dimensions $$100 \times 90 \times 20$$ (all in $$mm$$) is filled with molten metal througgh a gate with height $$'h'$$ and $$C.S$$ area ...
In a sand casting process, a sphere and a cylinder of equal volumes are separately cast from the same molten metal under identical conditions. The hei...
During the filling process of a given sand mould cavity by metal through a horizontal runner of circular $$C.S,$$ the frictional head loss of the molt...
A solid cylinder of diameter $$D$$ and height equal to $$D,$$ and a solid cube of side $$L$$ are being sand cast by using the same material. Assuming ...
In sand casting of hallow part of lead, a cylindrical core of diameter $$120mm$$ and height $$180mm$$ is placed inside the mould cavity. The densities...
In a sand casting process, a sprue of $$10mm$$ base diameter and $$250mm$$ height leads to a runner which fills a cubical mold cavity of $$100mm$$ siz...
In a sand casting process, a sprue of $$10mm$$ base diameter and $$250mm$$ height leads to a runner which fills a cubical mold cavity of $$100mm$$ siz...
Match the following
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A casting of size $$400mm \times 200mm \times 140mm$$ solidifies in $$20min.$$ The solidification time for a casting $$400mm \times 200mm \times 35mm$...
The shape factor for a casting in the form of an annular cylinder of outside diameter $$30$$ $$cm,$$ inside diameter $$20$$ $$cm$$ and height $$30$$ $...
A cast steel slab of dimension $$30 \times 20 \times 5\,\,cm$$ is poured horizontally using a side riser. The riser is cylindrical in shape with diame...
Match the items of List $${\rm I}$$ (Equipment) with the items of List $${\rm II}$$ (Process) and select the correct answer using the given codes
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A casting of size $$100\,\,mm \times 100\,\,mm \times 50\,\,mm$$ is required. Assume volume shrinkage of casting $$2.6\% $$. If the height of the rise...
Gating ratio of $$1:2:4$$ is used to design the gating system for magnesium alloy casting. This gating ratio refers to the cross section areas of the ...
Chapters are placed between mould and core surfaces in order to :
The height of the down sprue is $$175$$ $$mm$$ and its $$CS$$ area at the base is $$200\,\,m{m^2}.$$ The $$CS$$ area of the horizontal runner is also ...
The permeability of molding sand was determined using a saturated $$AFS$$ sample by passing $$2000cc$$ of air at a gage pressure of $$10$$ $$g/c{m^2}$...
Proper gating design in metal casting
$$P:$$ Influences the freezing range of the melt
$$Q:$$ Compensates the loss of fluidity of the melt
$$R:$$ F...
A $$10$$ $$mm$$ thick steel bar is to be horizontally cast with two correctly spaced top risers of adequate feeding capacity. Assuming end effect with...
...
Match the cast defect with their cause
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According to Chvorinove's rule, the solidification time of a casting is proportional to [Volume/Surface area]n where $$n=....$$
Manufacturing process $$\,\,\,\,\,\,\,\,\,\,\,\,$$ Property
...
Match the application with type of pattern
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When there is no room temp change, the total shrinkage allowance on a pattern is INDEPENDENCE OF
What is the velocity of the steel at the bottom of the sprue if the sprue height is $$30$$ $$cm$$? Assume the frictional and other losses to be $$20\...
Shrinkage allowance on pattern is provided to compensate for shrinkage when
Marks 5
For true centrifugal casting process with the axis of rotation in horizontal direction, an acceleration of $$75g,$$ where $$g$$ is the acceleration du...
A cylinder of $$150mm$$ diameter & $$200mm$$ height is to be cast with out any riser. The cylinder is moulded entirely in the drag of a green sand...
A casting of $$200\,\,mm\,\, \times \,\,100\,\,mm \times 70\,\,mm$$ size solidifies in ten minutes. Estimate solidification time for a $$200\,\,mm\,\,...
If the freezing ratio equal to (casting area/casting volume)/(riser area/riser volume) & the volumetric ratio equal to riser volume/casting volume...
Molten aluminium was poured in a sand mold and the thickness of solid skin formed after $$20$$ seconds and $$50$$ seconds were fond to be $$3mm$$ and ...
Marks 6
Three castings are of the same material, volume and cast under similar conditions. One is a sphere, another is a cube and the third is cylinder with i...
Three castings are of the same material, volume and cast under similar conditions. One is a sphere, another is a cube and the third is cylinder with i...
A rectangular block of steel $$C.S$$ $$100\,\, \times \,\,150mm$$ and $$250mm$$ height is to be cast with out any riser. The block is moulded entirely...
A steel plate $$40cm \times 30cm \times 0.3cm$$ is to be cast. The volume shrinkage of steel during solidification is $$3\% .$$ A cylindrical side ris...