题目内容

Pure metal solidifies at a ( )temperature equal to its freezing point (same as melting point).

A. Constant
B. Different
C. Fluctuant
D. None of the above

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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

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

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