GATE Production & Industrial

In carbon dioxide molding process, the binder used is

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 $$100\,\,mm \times 200\,\,mm.$...

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 $$300$$ $$mm$$ from the runner having...

Chills are used in casting moulds to

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 made

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 original casting, will 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 $$A,$$ the mould filling time...

In sand casting fluidity of the molten metal increases with

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 height and diameter of the cylind...

Which of the following casting processes uses expandable pattern and expandable mold

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 molten metal in the runner will in...

Solidification time of a metallic alloy casting is

Hot chamber die casting is NOT suited for

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 there is no super-heat in both...

In hollow cylindrical parts made by centrifugal casting, the density of the part is

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 of core material and lead are...

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 $$100mm$$ size. The volume flow rate (in $$...

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 $$100mm$$ size. The mold filling time in se...

Cold shut is a defect in casting due to

A casting of size $$400mm \times 200mm \times 140mm$$ solidifies in $$20min.$$ The solidification time for a casting $$400mm \times 200mm \times 35mm$$ under similar conditions is

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 diameter and height, both equal to...

An expandable pattern is used in

The shape factor for a casting in the form of an annular cylinder of outside diameter $$30$$ $$cm,$$ inside diameter $$20$$ $$cm$$ and height $$30$$ $$cm$$ (correction factor $$k=1...

Wood flour is added to core sand to improve:

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 riser is $$80$$ $$mm$$ and riser v...

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 various gating elements as giv...

Chapters are placed between mould and core surfaces in order to :

Which one of the following is NOT a property of a sand mold?

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 $$200$$ $$m{m^2}$$. Assuming n...

Proper gating design in metal casting $$P:$$ Influences the freezing range of the melt $$Q:$$ Compensates the loss of fluidity of the melt $$R:$$ Facilitates top feeding of the mel...

The permeability of molding sand was determined using a saturated $$AFS$$ sample by passing $$2000cc$$ of air at a gage pressure of $$10$$ $$g/c{m^2}$$. If the time taken for the a...

A $$10$$ $$mm$$ thick steel bar is to be horizontally cast with two correctly spaced top risers of adequate feeding capacity. Assuming end effect without chill, what should be the...

For true centrifugal casting process with the axis of rotation in horizontal direction, an acceleration of $$75g,$$ where $$g$$ is the acceleration due to gravity, is required for...

Shell molding is an investment casting process $$(T/F)$$

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 its length being equal to its d...

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 its length being equal to its d...

Bentonite is commonly used bonding material for dry sand cores

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 flask & is top gated. The cope of...

According to Chvorinove's rule, the solidification time of a casting is proportional to [Volume/Surface area] n where $$n=....$$

A casting of $$200\,\,mm\,\, \times \,\,100\,\,mm \times 70\,\,mm$$ size solidifies in ten minutes. Estimate solidification time for a $$200\,\,mm\,\, \times \,\,100\,\,mm \times 1...

Increase in carbon content in plain carbon steels raise its

The primary function of a riser is to

Chaplets are placed between mold in order to

Investment casting uses ......... (wax / resin coated sand) as pattern material and is preferred for small parts with ................. (simple/intricate) designs

Investment casting uses ...... A........... as pattern material and is preferred for small parts with .......... B.........designs. A. wax / resin coated sand B. simple / intricate

If the freezing ratio equal to (casting area/casting volume)/(riser area/riser volume) & the volumetric ratio equal to riser volume/casting volume, for a disc casting of $$20cm$$ d...

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 rate. A. higher / lower,$$\,\,...

Low permeability molds and low pouring temperature of the molten metal causes ......................... defect in castings.

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 in the drag of a green sand f...

The optimum pouring time for a casting depends on several factors. One important factor among them is

The problem of shrinkage cavity is more likely to occur while casting ......... A ............ B.......... a chill block (A.) metal / plastic , (B.) with / without.

For casting of turbine blades made of high temp and high strength alloys, the most suitable process is

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 riser with diameter $$4cm$$ and h...

When there is no room temp change, the total shrinkage allowance on a pattern is INDEPENDENCE OF

Shrinkage allowance on pattern is provided to compensate for shrinkage when

Green strength in powder metallurgy refers to the strength of

For the same material, powder metallurgy process is superior to casting for

Negative allowance is provided on the pattern to take care of

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

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 $$20\% $$

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 $$4.5mm$$ respectively. What w...