On This Page
This set of Foundry Technology Multiple Choice Questions & Answers (MCQs) focuses on Foundry Technology Set 1
Q1 | Permeability of moulding sand is increased due to/by
- Hard ramming
- Soft ramming
- Clay
Q2 | In small castings which of the following allowance can be ignored?
- Machining allowance
- Rapping allowance
- Draft allowance
- Shrinkage allowance
Q3 | The design of gate should be such as to
- avoid erosion of cores and mould cavity
- prevent scum, slag and eroded sand particles from entering the mould cavity
- minimize turbulence and dross formation
- all of the above
Q4 | Mixing coal dust with moulding sand results in
- blackening of the mould
- strong mould
- good air venting
- none of the above
Q5 | The order of dimensional accuracy in die casting is nearly
- 4 percent
- 0.4 percent
- 0.04 percent
- 0.004 percent
Q6 | Hairlines in die casted materials result from
- chemical attack
- mechanical erosion
- thermal fatigue
- all of the above
Q7 | Flux used in cupola while melting cast iron is
- lime stone
- coke slurry
- molasses
- any of the above
Q8 | Which heat treatment is applicable to aluminium alloy castings?
- Stabilizing
- Solution heat treatment
- Artificial ageing
- all of the above
Q9 | Die casting is generally not used for
- cast iron
- zinc base alloys
- aluminium base alloys
- non-ferrous metals
Q10 | The principal ingredients of moulding sands are
- silica sand, carbon, hydrocarbons and moisture
- silica sand, clay and water
- silica sand, dust and crabon
- silica sand, carbon and water
Q11 | The function of ejection pin in die casting is to
- pushout casting off the die
- provide movable core spaces
- facilitate die casting of several components
- none of the above
Q12 | Which of the following process is used for melting of steel?
- L D process
- Kaldo process
- Duplex process
- All of the above
Q13 | Slag and dross can be removed by
- skimming from the molten metal
- using bottom pouring ladle
- using pouring basin in place of a pouring cup
- any of the above
Q14 | Sand acquires a predetermined shape under pressure and retains the same when pressure is removed. This is due to the property of sand known as
- Cohesiveness
- Plasticity
- Refractoriness
- none of the above
Q15 | Refractoriness in the moulding sand is due to the presence of
- Clay
- Additives and Binders
- Silica
Q16 | Heat treatment of castings is usually done for
- refinement of grain structure
- improving machinability
- relieving internal stress
- any of the above
Q17 | Average amount of sand required in a foundry for making one tonne of casting is nearly
- 2 tonnes
- 20 tonnes
- 0.1 tonne
- 0.2 tonne
Q18 | On drying, wood
- expands
- shrinks
- changes colour
Q19 | Aluminium is not a very good material for die casting because
- it is very light but strong
- its melting point is high, it erodes the die surface and tends to react chemically with die
- it cools much slowly
- none of the above
Q20 | Warped castings may be produced due to
- poor collapsibility of cores
- non-provision of camber allowance on the pattern
- weak flasks
- any of the above
Q21 | The most efficient shape of a series is that which
- given a minimum heat loss
- keeps the metal in molten state for longer period
- both (A) and (B) above
Q22 | The purpose of clay in a moulding sand is to
- Act as a binder in the mould
- Make the mould refractory
- Mak the mould permeable
Q23 | A defect in castings in which a discontinuity is formed due to the imperfect fusion of two streams of metal in the mould cavity is known as
- scabs
- hot tears
- cold shut
- drops
Q24 | Of the following metals, the pouring rate should be minimum for
- brass
- cast iron
- aluminium
- steel
Q25 | Which of the following metal can be cast in plaster moulds?
- Yellow brass
- Manganese
- Aluminium bronzes
- All of the above