Virtual Labs

To study the various steps of Investment casting process

What is the purpose of the gating system in investment casting? (LO2)

a: To remove impurities from the molten metal Explanation

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b: To allow gases to escape from the mould Explanation

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c: To direct molten metal into the mould cavity Explanation

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d: To cool the metal faster after pouring Explanation

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Why is the ceramic mould preheated before pouring molten metal?

a: To expand the cavity for more metal to enter Explanation

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b: To remove moisture and prevent thermal shock Explanation

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c: To increase the strength of the ceramic mould Explanation

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d: To make the molten metal flow slower Explanation

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What happens after the molten metal solidifies in the ceramic mould? ()

a: The wax pattern reforms inside the mould Explanation

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b: The ceramic mould is broken to remove the casting Explanation

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c: The ceramic mould is stored for reuse Explanation

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d: The metal is reheated to remove any internal stresses Explanation

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Which finishing operations are commonly performed after investment casting?

a: Sandblasting and grinding Explanation

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b: Adding more wax to strengthen the part Explanation

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c: Recasting the part to correct errors Explanation

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d: Polishing the ceramic mould for reuse Explanation

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Why is wax used to create patterns in investment casting?

a: Wax is cheap and reusable Explanation

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b: Wax has a high melting point and does not deform Explanation

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c: Wax melts easily and can be removed without damaging the mould Explanation

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d: Wax strengthens the final metal casting Explanation

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What is the purpose of the refractory coating in investment casting?

a: To prevent oxidation of the molten metal Explanation

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b: To strengthen the wax pattern Explanation

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c: To form a smooth, high-precision mould for casting Explanation

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d: To speed up solidification of the metal Explanation

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What is a major disadvantage of investment casting?

a: It cannot be used for complex shapes Explanation

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b: It is a time-consuming and expensive process Explanation

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c: It produces rough surface finishes Explanation

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d: It can only be used for ferrous metals Explanation

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Why is investment casting suitable for aerospace and medical applications?

a: It produces high-precision components with minimal machining Explanation

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b: It is the fastest casting process available Explanation

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c: It requires less expensive materials Explanation

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d: It allows for reusable moulds Explanation

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Which type of metals can be cast using investment casting?

a: Aluminium and magnesium alloys Explanation

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b: Stainless steels and tool steels Explanation

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c: Titanium and superalloys Explanation

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d: All of the above Explanation

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Why is investment casting also known as lost-wax casting?

a: Because the wax pattern is reused for multiple castings Explanation

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b: Because the wax pattern melts and mixes with the metal Explanation

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c: Because the wax pattern is melted out and lost before casting Explanation

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d: Because wax is the final material used in the casting process Explanation

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