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This set of Foundry Technology Multiple Choice Questions & Answers (MCQs) focuses on Foundry Technology Set 2
Q1 | High pouring rate leads to
- mould erosion
- rough surface
- excessive shrinkage
- any of the above
Q2 | The most suitable metals for die casting are
- zinc and its alloys
- copper and its alloys
- aluminium and its alloys
- none of the above
Q3 | All of the following are clamping tools EXCEPT
- Pich dog
- C-clamp
- Hard screw
- Brace
Q4 | Pattern draft for external surfaces is (in mm/m)
- 15 -- 50
- 10 -- 25
- 40 - 60
Q5 | Sand is broadly specified by
- grain size
- colour
- moisture content
- all of the above together
Q6 | Chaplets are made of
- wood
- metal
- organic matter
- core sand
Q7 | Clay content of green sand is usually
- 5 to 10 percent
- 1 to 3 percent
- 30 to 50 percent
- 18 to 30 percent
Q8 | The sprue pin/sprue hole used for sand moulds is
- Tapered downwards
- Has no taper at all
- Tapered upwards
Q9 | Pig iron is obtained from iron ore, in a blast furnace by the process of
- oxidation
- desulphurisation
- reduction
- carbonation
Q10 | Which of the following statement about gates is incorrect?
- he size of gate depends upon the rate of solidification
- More than one gate may be used to feed a fast freezing casting
- A gate should not have sharp edges
- A small gate is used for castings which solidify rapidly
Q11 | In case of arc furnaces electric supply for electrodes consists of
- low voltage and high current
- low voltage and low current
- high voltage and high current
- high voltage and low current
Q12 | The sand used for filling the bulk of the moulding flask
- Facing sand
- Dry-sand
- Floor sand
Q13 | In fluminium foundry, for removing dissolved hydrogen and the entrapped dross, the flux used is
- nitrogen
- helium
- chlorine
- any of the above
Q14 | Choose the correct statement in respect of die casting machine
- In hot chamber die casting machine the metal is melted in the machine itself
- In cold chamber die casting machine metal of low melting point is cast
- In cold chamber die casting machine there is no need to cool the die from outside
- none of the above
Q15 | The thicker sections of casting will have a tendency to have
- grains coarser than thinner sections
- grains finer than thinner sections
- grains of sme size as rest of the casting
- none of the above
Q16 | The moulding tool used for finishing/repairing the sand mould after pattern withdrawal is termed as
- Slincks
- Lifters or cleaners
- Trowels
Q17 | Which of the following test on castings is based on sound?
- Magnetic particle inspections
- Percussion test
- Impact test
- Radiographic
Q18 | Presence of sulphur in cast iron
- retards fluidity
- promotes brittleness
- promotes oxidation
- all of the above
Q19 | Hand tool used in foundry shop for mixing and conditioning the foundry sand is termed
- Shovel
- Trowel
- Riddle
Q20 | Shell moulding is uneconomical for
- small castings
- large scale production
- small scale production
- all of the above
Q21 | Shatter test is a measure of
- sand toughness
- sand adhesiveness
- sand cohesiveness
- none of the above
Q22 | Cohesiveness of sand depends on
- grain size and shape of sand particles
- bonding material
- moisture content
- all of the above
Q23 | Which grain shape of sand particles is least preferred for foundry sands?
- Round
- Compound
- angular
Q24 | In melting of aluminium, the dross consists of
- oxides of aluminium, magnesium etc.
- sand and dust
- lighter material
- none of the above
Q25 | The disadvantage in using wood as the material for pattern making is
- it is lighter than the metal to be cast
- its different strength along the grains and across the grains
- its low cost
- it gets warped when not stored properly