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GATE 2019: Manufacturing Quiz 2- Theory
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Question 1
Moulding sand is a mixture of sand, clay and water and some additives. These are needed to be in appropriate proportion. Which of the following is the correct proportion of composition ________.
Question 2
Given below is the permeability of different sands available for moulding. Which one is the best?
Question 3
Equal amounts of a liquid metal at the same temperature are poured into three moulds made of steel, copper and aluminium. The shape of the cavity is a cylinder with 15 mm diameter. The size of the moulds are such that the outside temperature of the moulds do not increase appreciably beyond the atmospheric temperature during solidification. The sequence of solidification in the mould from the fastest to slowest is
(Thermal conductivities of steel, copper and aluminium are 60.5, 401 and 237 W/m-K, respectively. Specific heats of steel, copper and aluminium are 434, 385 and 903 J/kg-K, respectively. Densities of steel, copper and aluminium are 7854, 8933 and 2700 kg/m3. Respectively .)
(Thermal conductivities of steel, copper and aluminium are 60.5, 401 and 237 W/m-K, respectively. Specific heats of steel, copper and aluminium are 434, 385 and 903 J/kg-K, respectively. Densities of steel, copper and aluminium are 7854, 8933 and 2700 kg/m3. Respectively .)
Question 4
Which of the following materials are used for making patterns in investment casting method?
1). Wax 2). Rubber
3). Wood 4). Plastic
Select the correct answer using the codes given below:
1). Wax 2). Rubber
3). Wood 4). Plastic
Select the correct answer using the codes given below:
Question 5
Consider the following statements in respect of investment castings :
1). The pattern or patterns is/are not joined to a stalk or sprue also of wax to form a tree of patterns.
2). The prepared moulds are placed in an oven and heated gently to dry off the invest and melt out the bulk of wax.
3). The moulds are usually poured by placing the moulds in a vacuum chamber.
Which of these statements are correct?
1). The pattern or patterns is/are not joined to a stalk or sprue also of wax to form a tree of patterns.
2). The prepared moulds are placed in an oven and heated gently to dry off the invest and melt out the bulk of wax.
3). The moulds are usually poured by placing the moulds in a vacuum chamber.
Which of these statements are correct?
Question 6
In which one of the following furnaces most of the nonferrous alloys are melted?
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