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This set of Manufacturing Technology 1 Multiple Choice Questions & Answers (MCQs) focuses on Manufacturing Technology I Set 3
Q1 | The axis of rotation of the mould should be horizontal for the casting of long pipes in centrifugal casting.
- true
- false
Q2 | Dry sand cores may be required for the provision of spigot at the end section of the casting.
- true
- false
Q3 | In centrifugal casting, only sand moulds can be used due to the problem of sticking of metal.
- true
- false
Q4 | In centrifugal casting, the casting yield is approximately equaled to 100%.
- true
- false
Q5 | In centrifugal casting, a movable pouring basin is employed for the pouring of molten metal.
- true
- false
Q6 | The speed of rotation is almost double in semi centrifugal casting as compared to the true centrifugal casting.
- true
- false
Q7 | Which of the following moulds or moulding is also known as sodium silicate process.
- shell moulding
- permanent moulding
- slush moulding
- co2 moulding
Q8 | How much percentage of sodium silicate (Na2SiO3) is added to the sand mixture in Co2 moulding?
- 0 to 2 %
- 2 to 6 %
- 6 to 10 % d) 10 to 14 %
Q9 | Continuous passing of Co2 through the mould can decrease the strength of mould and results in a weak mould.
- true
- false
Q10 | How much time (in a minute) is usually required for the passing of Co2 through the mould?
- one
- two
- five
- seven
Q11 | Sometimes over-gassing can cause the sticking of pattern to the mould in Co2 moulding.
- true
- false
Q12 | It is very safe to use Co2 in Co2 moulding, so it eliminates the use of any shielding apparatus.
- true
- false
Q13 | Which of the following additives are added to the sand in Co2 moulding for the improvement in collapsibility of the sand?
- copper oxide
- wood flour
- aluminium oxide
- oil
Q14 | Co2 moulding process is an ideal process, where speed and flexibility is the prime requirement.
- true
- false
Q15 | Moisture from the mould can be removed by using of dryer or heater in Co2 moulding.
- true
- false
Q16 | Co2 moulding is a kind of sand moulding, but it is not economical than the green sand moulding.
- true
- false
Q17 | Which of the following defect is not a gas defect?
- blow holes
- air inclusions
- run out
- pin hole porosity
Q18 | Which gas defect is caused by hydrogen in molten metal?
- blow holes
- air inclusions
- open blows
- pin hole porosity
Q19 | Cuts, washes, swell, drop etc. are the examples of which of the following casting defects?
- gas defect
- pouring material defect
- moulding material defect
- metallurgical defect
Q20 | When the molten metal leaks out of mould which defect occurs?
- run out
- misrun
- fusion
- drop
Q21 | The lower fluidity of molten material causes
- misrun
- cold shut
- misrun & cold shut
- fusion
Q22 | Defects caused by the chilling of the casting are known as?
- hot spots
- hot tears
- shrinkage cavity
- swell
Q23 | During melting process flux is added to react with impurities to form?
- cavity
- slag
- cold shut
- blow holes
Q24 | Which defect is caused due to the conversion of moisture to steam because of the heat of molten metal?
- blow holes
- open blows
- air inclusions
- cold shut
Q25 | Defect which occurs due to the solidification of casting is known as?
- swell
- misrun
- metal penetration
- shrinkage cavity