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This set of Foundry Technology Multiple Choice Questions & Answers (MCQs) focuses on Foundry Technology Set 3
Q1 | Distortion in castings can be reduced by
- modifying design
- providing sufficient machining allowance
- improving foundry practice
- all of the above
Q2 | Which of the following facilitates shaking and lifting large pattern from the mould?
- Swab
- Bellows
- Trowel
- Ripping plate
Q3 | In die castings, heavy local sections are usually avoided and replaced by
- channel sections
- corrugated forms
- ribs
- any of the above
Q4 | Which inoculant is used to produced ductile iron?
- Graphite
- Carbon
- Fluorides
- Magnesium
Q5 | There is no need for the withdrawal of pattern from the mould in case of
- patterus with core
- wax patterns
- hollow patterns
- consumable patterns
Q6 | Annealing of aluminium castings
- improves ductility
- relieves micro stresses
- reduces tensile strength
- mechanical properties change
Q7 | The sand mass does not fall out of the moulding box but is held firmly in it when the moulding box is lifted. This is due to the property of
- adhesiveness of sand
- plasticity of sand
- porosity of sand
- refractoriness of sand
Q8 | Which of the following is used to obtain fine surface finish in ferrous castings?
- Ground pitch
- Sea coal
- Gilsonite
- any of the above
Q9 | For grey cast iron the pouring temperature is
- 1400 to 1465?C
- 1455 to 1495?C
- 1250 to 1290?C
- 1510 to 1532?C
Q10 | Permeability of sand decreases as
- permeability increases
- moisture content increases
- bonding content increases
- all of the above
Q11 | On the interior surfaces the draft allowance is usually
- 40 to 60 mm/metre
- 10 to 20 mm/metre
- 100 to 120 mm/metre
- 200 to 225 mm/metre
Q12 | The hardness of the mould is affected by the proportion of ingredients in the sand and
- degree of ramming
- the temperature
- shape of particles
- refractoriness
Q13 | In furan process, furan resins are primarily used as
- binders
- chemicals for exothermic reactions
- fluxes
- none of the above
Q14 | The advantage of investment casting is
- high degree of accuracy
- adaptability to casting of most of the metals
- complex shaped articles can be cast
- all of the above
Q15 | Hot blast of air is supplied to the blast furnace through
- spout
- stoves
- prop
- tuyers
Q16 | Core prints are
- made separately in the mould by hand
- made in the mould be separate pattern
- attached to pattern
- none of the above
Q17 | In die casting
- there is no need of air venting
- there is no restriction of material, any material that can be poured can be cast
- the product surface is smooth and clean without the parting line
- the heat loss from molten metal is fast as the mould is metallic
Q18 | The water content of green sand is usually
- 1 to 2 percent
- 20 to 25 percent
- 6 to 8 percent
- 12 to 18 percent
Q19 | Tin coated low carbon steel chaplets are used in
- ferrous foundries
- non-ferrous foundries
- both (A) and (B) above
Q20 | Scabs may be caused by
- low permeability of sand
- high moisture content of sand
- intermittent running of molten metal over the sand surface
- any of the above
Q21 | The order of surface finish possible in die castings is
- 0.08 microns
- 0.008 microns
- 0.0008 microns
- 0.8 microns
Q22 | The contraction allowance for magnesium is around
- 5 mm/metre
- 14 mm/metre
- 25 mm/metre
- 1 mm/metre
Q23 | Plaster patterns and core boxes are made of
- White powder
- Plaster of Paris
- Gypsum cement
- Bone china clay
Q24 | Composition of cast iron can be better controlled when melted in
- pit furnace
- cupola
- arc furnace
- none of the above
Q25 | By compacting the sand
- both density as well as permeability decrease
- density increases and permeability
- both density as well as permeability increase
- density decreases and permeability increases