题目内容

Riser is a reservoir in the mold which is a source of liquid metal to compensate for（） of the part during solidification

A. Shrinkage
B. Heat transfer
C. Volume growth
D. Melting point

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At the top of down-sprue, a pouring cup is often used to minimize（）as the metal flows into down-sprue

A. Splash and turbulence
B. Hardness
C. Viscosity
Density

Gating System in sand casting consists of a down-sprue, through which metal enters a（） leading to the main cavity

A. Runner
B. Pouring cup
C. Riser
D. Core

In sand casting, the use of a Core in the Mold Cavity provides（）

A. external features
B. internal features
C. internal external features
D. none of the above

For sand casting when the（）is removed, the remaining cavity of the packed sand has desired shape of cast part

A. Pattern
B. Part
C. Wet sand
D. Cavity