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This set of Foundry Technology Multiple Choice Questions & Answers (MCQs) focuses on Foundry Technology Set 7
Q1 | As the moisture content of sand increases
- permeability remains unchanged
- permeability decreases
- permeability increases
Q2 | The advantage of permanent mould casting is
- reduced labour charges
- reduced mould cost
- dense, fine grained structure
- all of the above
Q3 | Which of the following holes appear on the surface of the casting when it is machined?
- Pin holes
- Slag holes
- Gas holes
- Blow holes
Q4 | Which wood can be used for making patterns?
- Mathogany
- Pine wood
- Teak wood
- any of the above
Q5 | In case of malleable iron castings, the contraction allowance on pattern
- is independent of section thickness
- increass as the section thickness of casting increases
- decreases as the section thickness of casting increases
Q6 | Contraction allowance for grey cast iron is (in mm/m)
- 21
- 30
- 10.5
Q7 | In case of plaster moulding the mould is prepared in
- gypsum plaster
- slacked lime
- lime + cement
- any of the above
Q8 | Which statement is not true for green sand moulding?
- Moulds are cheapest
- Preparation of moulds is less time consuming
- Defect free and castings with good surface is obtained
- none of the above
Q9 | Melting point of copper
- 1444?C
- 1576?C
- 665?C
- 1083?C
Q10 | Rough surface of casting may result from
- high permeability of sand
- large grain size
- soft ramming
- any of the above
Q11 | A casting process which can produce cylinders by inserting cores into molten metal poured in the mould is
- Semi permanent mould casting
- pressed casting
- permanent mould or gravity die casting
- none of the above
Q12 | When sulphur is to be removed from cast iron while melting the same in cupola, the flux used is
- molasses
- sodium carbonate with lime stone
- zinc sulphate with lime stone
- none of the above
Q13 | A mould cracks after drying. It indicates
- excess of clay
- lack of clay
- coarse irregular grains
- none of the above
Q14 | Moisture content of the moulding sand is commonly
- 5% - 15%
- 1% - 4%
- 2% - 8%
Q15 | Electric furnaces can usually operate upto a temperature of
- 1250?C
- 1700?C
- 2200?C
- 1000?C
Q16 | Inoculants are added to aluminium mainly for
- grain refinement
- directional solidification
- purification
- all of the above
Q17 | Permanent mould casting is also known as
- chill casting
- short casting
- gravity die casting
- slush casting
Q18 | In investment casting the pattern is made of
- wood
- urea formaldehyde
- wax
- none of the above
Q19 | Consumable patterns are made of
- polystyrene
- wax
- plaster of paris
- any of the above
Q20 | The function of riser is
- to allow the heat of molten metal to dissipate to atmosphere
- to provide an opening through which molten metal is poured
- to give an indication that mould is filled
- to supply molten metal to casting as it tends to contract during solidification
Q21 | According to Chvorinov's equation, the solidification time of castings is
- Directly proportional to square of the volume of the casting
- inversely proportional to the volume the casting
- inversely proportional to square of the volume of the casting
- directly proportional to the volume of the castings
Q22 | Swelling of castings may occur due to
- insufficient ramming
- rapid pouring of molten metal
- insufficient weight on the moulds during pouring
- any of the above
Q23 | Graphitic cast iron is
- hard
- non-machinable
- low in damping capacity
- high in compressive strength
Q24 | Shrinkage cavity in a casting may be formed due to
- haphazard solidification of metal
- improperly sized gating
- high pouring temperatures
- any of the above
Q25 | Investment casting is also known as
- lost wax casting
- lost pattern casting
- hot investment casting
- any of the above