Question:
Liquid contraction during solidification of a casting will be taken care by
Liquid contraction during solidification of a casting will be taken care by
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Riser should solidify last to supply molten metal effectively.
Updated On: Jun 29, 2026
- Runner
- Sprue
- Riser
- Gate
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The Correct Option is C
Solution and Explanation
Concept:
During solidification, metals contract in volume. If not compensated, shrinkage cavities form.
Step 1: Understand shrinkage mechanism.
When molten metal cools:
• liquid contracts first
• then solidification shrinkage occurs
Step 2: Role of riser.
A riser acts as a reservoir of molten metal that feeds the casting during solidification shrinkage.
• compensates volume loss
• ensures sound casting
Step 3: Why other options are wrong.
• Runner → metal flow channel
• Sprue → vertical entry channel
• Gate → entry into mould cavity Final Answer: \[ \boxed{\text{Riser}} \]
Step 1: Understand shrinkage mechanism.
When molten metal cools:
• liquid contracts first
• then solidification shrinkage occurs
Step 2: Role of riser.
A riser acts as a reservoir of molten metal that feeds the casting during solidification shrinkage.
• compensates volume loss
• ensures sound casting
Step 3: Why other options are wrong.
• Runner → metal flow channel
• Sprue → vertical entry channel
• Gate → entry into mould cavity Final Answer: \[ \boxed{\text{Riser}} \]
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