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This set of Foundry Technology Multiple Choice Questions & Answers (MCQs) focuses on Foundry Technology Set 8
Q1 | Which of the following is core hardening process?
- CO2 process
- Cold set process
- Furan system
- All of the above
Q2 | Blow holes in castings are due to
- high moisture content of the sand
- low permeability of sand
- excessive fine grains and gas producing ingredients
- any of the above
Q3 | When wooden patterns with metallic coating are to be used, the metal sprayed on wooden pattern could be
- bismuth
- zinc
- aluminium
- any of the above
Q4 | Shell moulding can be used for
- producing thin castings
- better surface finish
- tolerances of the order of 0.002 mm per mm
- all of the above
Q5 | In case of carbondioxide moulding, the binder used is generally
- coal dust
- graphite
- sodium silicate
- china clay
Q6 | Aluminium castings are not repaired by
- inert gas metal arc welding
- braze welding
- soldering
- All of the above
Q7 | First step in reclaiming the moulding and core sand is
- addition of moisture
- reproportioning of binder
- separation of metal particles
- any of the above
Q8 | If ash content of coke used in cupola is high then
- melting rate will be low
- castings produced will have blow holes
- more of flux will be required
- carbon content of castings will be low
Q9 | Non-uniform distribution of alloying components, inclusions and impurities in an ingot or casting are known as
- ageing
- bleeding
- innoculation
- segregation
Q10 | Clay used for foundry sand should be
- kaolinite
- montmorillonite
- illite
- any of the above
Q11 | Phenolic thermo-setting plastics are finding application in pattern making because
- they do not absorb moisture
- they are resistant to wear
- they have all above qualities
- they are strong
Q12 | The location of riser least depends on
- the size of core
- feasibility of directional solidification
- the metal to be cast
- design of casting
Q13 | In case of cast steel, the contraction allowance will be least for castings having dimensions
- upto 600 mm
- 1000 mm to 1800 mm
- 600 to 1000 mm
- above 1800 mm
Q14 | The "Green sand" is termed so, because
- it is green in colour
- it contains moisture
- none of the above
Q15 | A designer would attempt to avoid bosses and pads in the casting because
- projections such as bosses and pads can not merge with thinner sections
- it is difficult to incorporate in pattern
- they being thicker will take longer to solidify and hence will suffer from residual stresses and coarse grains
- mould formation is difficult in pressence of boss
Q16 | Padding is
- a method for production of chilled castings
- an extra support for thin castings
- an extra metal added to the original uniform section of the casting
- none of the above
Q17 | In case of cored aluminium castings, the contraction allowance is
- more than the normal allowance
- less than the normal allowance
- same as the normal allowance
Q18 | Chemical dipping of die casted parts is usually done for
- flash removal
- dimensional stability
- corrosion protection
- none of the above
Q19 | Head storage capacity of moulding sand can be increased by adding?
- graphite
- chromite
- magnesium powder
- any of the above
Q20 | Sand grains which give high mould strength are
- Sub-angular grains
- Rounded grains
- Sharp or Angular grains
Q21 | Oil fired furnaces are generally used for the melting of
- alloy steel
- cast steel
- cast iron
- non-ferrous metals
Q22 | Electric indirect are furnace is normally used for melting of
- alloy steels
- cast steels
- non-ferrous metals
- all of the above
Q23 | Wood used for pattern making has knots. This is likely to affect
- warping of the piece
- machinability of pattern
- moisture content of wood
- all of the above
Q24 | As a result of melting of cast iron in cupola, which of the following constituent undergoes least change in its percentage?
- Manganese
- Phosphorous
- Silicon
- Sulphur
Q25 | Investment casting can be used for which of the following alloys
- cobalt based satellite
- Tool steels
- Hynes super alloys
- All of the above