Virtual Labs

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Aim

Theory

Pretest

Procedure

Simulation

Posttest

References

Contributors

Feedback

To Prepare a pattern for given object for lost foam casting process

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Which factor differentiates lost foam casting from investment casting? (LO3)

a: Use of foam instead of wax for the pattern Explanation

Explanation

b: Need for bonded sand Explanation

Explanation

c: Higher cost compared to investment casting Explanation

Explanation

d: Use of permanent moulds Explanation

Explanation

Why is vibration necessary when using unbonded sand? (LO1)

a: To remove impurities Explanation

Explanation

b: To compact the sand and prevent defects Explanation

Explanation

c: To accelerate the melting of metal Explanation

Explanation

d: To remove air bubbles from the molten metal Explanation

Explanation

Why does lost foam casting not require a parting line? (LO1)

a: Because the foam pattern is made in two halves Explanation

Explanation

b: Because the pattern vaporises completely during casting Explanation

Explanation

c: Because the sand mould is permanently bonded Explanation

Explanation

d: Because the mould is reusable Explanation

Explanation

What role does the refractory coating play in lost foam casting? (LO1)

a: It strengthens the foam pattern Explanation

Explanation

b: It acts as a mould release agent Explanation

Explanation

c: It prevents metal penetration into the sand Explanation

Explanation

d: It speeds up the vaporisation of the foam Explanation

Explanation

What is one disadvantage of using unbonded sand in lost foam casting? (LO2)

a: It requires additional binders to hold its shape Explanation

Explanation

b: It is not reusable Explanation

Explanation

c: It may shift if not properly compacted Explanation

Explanation

d: It increases the casting temperature Explanation

Explanation

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