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The allowance provided to a pattern for easy withdrawal from a sand mold is

In a metal casting process to manufacture parts, both patterns and moulds provide shape by dictating where the material should or should not go. Which...

Fluidity of a molten alloy during sand casting depends on its solidification range. The phase diagram of a hypothetical binary alloy of components A a...

Consider sand casting of a cube of edge length a. A cylindrical riser is placed at the top of the casting. Assume solidification time, ts ∝ V/A, ...

Which of these processes involve(s) melting in metallic workpieces?

The welding process which uses a blanket of fusible granular flux is

Equal amounts of a liquid metal at the same temperature are poured into three moulds made of steel, copper and aluminum. The shape of the cavity is a ...

The part of a gating system which regulates the rate of pouring of molten metal is

In full mould (cavity-less) casting process, the Pattern is made of

Match the casting defects (Group A) with the probable causes (Group B): ...

The hot tearing in a metal casting is due 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...

Green sand mould indicates that

Two streams of liquid metal, which are not hot enough to fuse properly, result into a casting defect known as

Which of the following engineering materials is the most suitable candidate for hot chamber die casting

An expendable pattern is used in

Misrun is a casting defect which occurs due to

Hardness of green sand mould increase with

The primary purpose of a sprue in a casting mold is to

In centrifugal casting, the lighter impurities are

Shrinkage allowance on pattern is provided to compensate for shrinkage when

Disposable patterns are made of

Which of the following materials requires the largest shrinkage allowance, while making a pattern for casting?

Light impurities in the molten metal are prevented from reaching the mold cavity by providing a

Centrifugally casted products have

In a green sand moulding process, uniform ramming leads to

Converging passage is used for feeding the liquid molten metal into the mould to

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

The pressure at the in-gate will be maximum with the gating system

Chills are used in molds to

Increase in water content in moding sand causes

The contraction allowance provided on the pattern and core boxes compensates for the following type of contraction.

Riser is designed so as to

Aluminium is casted in a cube-shaped mold having dimensions as 20 mm × 20 mm × 20 mm. Another mold of the same mold material is used to cast a sphere ...

A sprue in a sand mould has a top diameter of $$20mm$$ and height of $$200mm.$$ The velocity of the molten metal at the entry of the sprue is $$0.5m/s...

Gray cast iron blocks of size $$100\,\,mm \times 50\,\,mm \times 10\,\,mm$$ with a central spherical cavity of diameter $$4$$ mm are sand cast. The sh...

Heat is removed from a molten metal of mass $$2$$ $$kg$$ at a constant rate of $$10$$ $$kW$$ till it is completely solidified. The cooling curve is sh...

A cylindrical job with diameter of $$200$$ $$mm$$ and height of $$100$$ $$mm$$ is to be cast using modulus method of riser design. Assume that the bot...

Ratio of solidification time of a cylindrical casting (height $$=$$ radius) to that of a cubic casting of side two times the height of cylindrical cas...

The dimensions of a cylindrical side riser (height $$=$$ diameter) for a $$25cm \times 15cm \times 5cm$$ steel casting are to be determined. For the ...

A cube and a sphere made of cast iron (each of volume $$1000\,\,c{m^3}$$) were cast under identical conditions. The time taken for solidifying the cub...

The solidification time of a casting is proportional to $${\left( {{V \over A}} \right)^2},$$ Where $$V$$ is the volume of the casting and $$A$$ is th...

A cylindrical riser of $$6$$ $$cm$$ diameter and $$6$$ $$cm$$ height has to be designed for a sand casting mould for producing a steel rectangular pla...

A cylindrical blind riser with diameter $$d$$ and height $$h,$$ is placed on the top of the mold cavity of a closed type sand mold as shown in the fig...

An aluminium alloy (density $$2600$$ $$kg/{m^3}$$ ) casting is to be produced. A cylindrical hole of $$100$$ $$mm$$ diameter and $$100$$ $$mm$$ length...

A cubic casting of $$50mm$$ side undergoes volumetric solidification shrinkage and volumetric solid contraction of $$4\% $$ and $$6\% $$ respectively....

For the case of molding, it is decided to replace a spherical riser of diameter $$100$$ $$mm$$ by a cylindrical riser. Determine size of the cylindric...

In a gating system, the ratio $$1:2:4$$ represents

Match the following ...

While cooling, a cubical casting of side $$40mm$$ undergoes $$3\% ,\,\,4\% $$ and $$5\% $$ volume shrinkage during the liquid state, phase transition ...

If a particular $$Fe$$-$$C$$ alloy contains less than $$0.83$$% carbon, it is called

Volume of a cube of a side $$''l''$$ and volume of sphere of radius $$' r '$$ are equal. Both the cube and the sphere are solid and same material. The...

A $$200$$ $$mm$$ long down sprue has an area of cross section of $$650$$ $$m{m^2}$$ where the pouring basin meets the down sprue (i.e. at the beginnin...

In a sand casting operation, the total liquid head is maintained constant such that it is equal to the mould height. The time taken to fill the mould ...

Match List - $${\rm I}$$ (products) with List - $${\rm II}$$ (casting process) and select the correct answer using the codes given below the lists ...

A mould has a downsprue whose length is $$20$$ $$cm$$ and the cross sectional area at the base of the down sprue is $$1\,\,c{m^2}.$$ The down sprue f...

Gray cast iron blocks $$200 \times 100 \times 10\,\,mm$$ are to be cast in sand moulds. Shrinkage allowance for pattern making is $$1$$%. The ratio of...

With a solidification factor of $$0.97 \times {10^6}s/{m^2},$$ the solidification time (in seconds) for a spherical casting of $$200$$ $$mm$$ diameter...

Match the following ...

Only $$4$$ pairs can be matched : ...

Match the following: ...

Two cubical castings of the same metal and sizes of $$2cm$$ side and $$4cm$$ side are moulded in green sand. If the smaller casting solidifies in $$2m...

Two castings, a cube and a slab of the same material solidify under identical conditions. The volumes of the castings are equal but the slab dimension...

Two castings of the same metal have the same surface area one casting is in the form of a sphere and the other is a cube. What is the ratio of the so...

Calculate the ratio of the solidification times of two steel cylindrical risers of sizes $$30cm$$ diameter by $$60$$ $$cm$$ in height and $$60cm$$ dia...

A down sprue of $$180mm$$ length has diameter of $$20mm$$ at its top end. The liquid metal in the pouring cup is main-tained upto $$60$$ $$mm$$ height...

In a particular mold design, the down sprue has an area of Cross section of $$6.45\,\,c{m^2}$$ where the pouring basin leads into the sprue. The sprue...

The pouring basin in a sand mold is $$200$$ $$mm$$ diameter $$100$$ $$mm$$ height. The mould cavity is a cube of $$125$$ $$mm$$ side and must be fille...

An aluminium cube of $$10$$ $$cm$$ side has to be cast along with a cylindrical riser of height equal to its diameter. The riser is not insulated on a...

A falk consisting of a cope and drag has the following dimensions: length $$300mm,$$ width $$200mm,$$ and total septh $$200mm$$ (cope height $$50mm$$)...