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## how to prepare casting for GATE

Casting is an important topic from GATE veiwpoint. You can find questions on casting in every years exam paper. The purpose of this article is to assist the candidates so that they can prepare this topic well. All important information about the things to prepare in Casting is shared in this article.

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## What to prepare?

In Casting process, all that requires your attention is briefly discussed below

• A GATE aspirant should study all the molds and their properties.

• Gating System should be prepared in depth because most of the questions asked from Casting stress upon the gating system.
• Other small subtopics under casting that need some attention are Vents, riser, core, Drafts,etc.
• Important material for casting and their properties.
• Alowance must be prepared as you can expect one question in the exam.
• Prepare die casting whole heartedly as it is very important from GATE viewpoint.

Let us look at some of the questions that had been asked in GATE from this topic.

## Question 1 :

A casting of cube shape solidifies in 5 min. What will be the solidification time in minutes for a cube of the same material, which is 8 times heavier than the original casting?

(A) 20

(B) 10

(C) 24

(D) 40

Explanation :

Since Weight is 8 times heavier

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## Question 2 :

During cooling down, a cubical casting of side 40 mm undergoes 3%, 4% and 5% volume shrinkage during the liquid state, phase transition and solid state, respectively. What is the volume of the metal compensated from the riser?

(A) 2 %

(B) 7 %

(C) 8 %

(D) 9%

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Explanation

The riser can compensate for volume shrinkage only in the liquid stage and during the transition stage but not in the solid state.

Hence, volume of metal which will be compensated from the riser =3+4=7%

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