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101.

Which of the following compound forms the bond between sand particles in carbon dioxide moulding process.(a) Sodium(b) Amorphous silica(c) Dehydrated water(d) Carbon MonoxideThe question was posed to me by my college professor while I was bunking the class.My question comes from Molding Processes topic in portion Mold and Mold Making of Casting-Forming-Welding I

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Correct choice is (b) Amorphous silica

Explanation: Amorphous silica forms the bond between SAND particles. It is produced by REACTION or treatment of the mixture of sand and sodium SILICATES by carbon dioxide.
Discussion
102.

Pit moulding is used for _________(a) Low weighting castings(b) Moderate weighting castings(c) Heavy weighting castings(d) Making castings that requires less time to processI have been asked this question in a national level competition.This key question is from Molding Processes in division Mold and Mold Making of Casting-Forming-Welding I

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Correct choice is (c) HEAVY weighting castings

Explanation: Very heavy castings can be MADE out using PIT moulding process. Castings WEIGHING up to 150 tons can be processed through pit moulding.
Discussion
103.

The baking process in plaster moulding process induces which of the following defects?(a) It depletes down the content of water at a very scarce level(b) It develops microscopic cracks onto the surface of mould(c) It gives the surface improper heat that causes differential heat treatment while casting solidification(d) The Calcium reacts at elevated temperatures used for baking the mouldThe question was asked in an interview.Question is taken from Molding Processes in section Mold and Mold Making of Casting-Forming-Welding I

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Correct choice is (b) It develops MICROSCOPIC cracks onto the surface of mould

Best explanation: The baking of mould in plaster moulding process causes the DEVELOPMENT of microscopic cracks, which results in improper surface of CASTING.
Discussion
104.

Which is not a machine molding process?(a) Jolting(b) Squeezing(c) Sand slinging(d) Hand moldingI have been asked this question during an online exam.I'd like to ask this question from Methods of Ramming Mold Boxes topic in section Mold and Mold Making of Casting-Forming-Welding I

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Correct option is (d) Hand molding

For explanation I would say: In jolting, a sand-filled mold is raised to a CERTAIN height and allowed to fall freely onto the ground CONVERTING potential energy into IMPACT energy which leads to ramming of sand. In squeezing, a press is used to apply pressure through a plate. In the sand slinging, small-small amount of sand will be THROWN that leads to localized ramming of sand. Hand molding is done without MACHINES.
Discussion
105.

What is the range of temperature used for baking molds using plaster moulding process?(a) 50°-100°(b) 80°-120°(c) 120°-260°(d) 250°-300°This question was addressed to me during an online exam.The origin of the question is Molding Processes in section Mold and Mold Making of Casting-Forming-Welding I

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The correct CHOICE is (c) 120°-260°

For EXPLANATION I would say: The preset MOULD is ignited to burn off the volatile content in the set gel to a TEMPERATURE range of 120°-260°.
Discussion
106.

In cement bonded sand mold, sand mold material consists of what percentage of Portland cement?(a) 10%(b) 15%(c) 20%(d) 25%I got this question in an interview for internship.This question is from Types of Molds in portion Mold and Mold Making of Casting-Forming-Welding I

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The correct choice is (a) 10%

The best explanation: In a cement BONDED sand mold, sand mold material consists of 10% COMPOSITION of Portland cement, whereas it contains 85.5% composition of silica sand.
Discussion
107.

Which of the following sand mold contains free water?(a) Green sand mold(b) Dry sand mold(c) Core sand mold(d) Shell moldThe question was asked in homework.My question is based upon Types of Molds in chapter Mold and Mold Making of Casting-Forming-Welding I

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Right CHOICE is (a) GREEN sand mold

For explanation I would say: AMONG the following, green sand mold is found to CONTAIN free WATER. Since it is known to contain some amount of free water, there is some dampness seen in it.
Discussion