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GATE 2019: Manufacturing Quiz 2- Numericals (App update required to attempt this test)

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Question 1

Mould having dimensions is filled with molten metal through a bottom gate with height 50 mm and area of gate 150 mm2. The mould filling time is _____ seconds.
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Question 2

Calculate the permeability number for a casting. The given pressure is 20g/sq cm and time is 20 mins(assume standard values for other variables)

Question 3

A casting undergoes a volumetric solidification shrinkage of 5%. The side of a cubical casting is 6 cm. What will be the volume left after solidification shrinkage.

Question 4

A down sprue of 18 cm length has radius of 10 mm at its top end. The liquid metal in the pouring cup is maintained upto 6 cm height. For no aspiration condition, the diameter of lower end of downsprue will be?

Question 5

A mould has a downsprue whose length is 20 cm and the cross sectional area at the base of the downsprue is 1 cm2. The downsprue feeds a horizontal runner leading into the mould cavity of volume 1000 cm3. The time required to fill the mould cavity will be

Question 6

A 200 mm long down sprue has an area of the cross-section of 650 mm2 where the pouring basin meets the down sprue (i.e. at the beginning of the down sprue). A constant head of molten metal is maintained by the pouring basin. The molten metal flow rate is 6.5 × 105 mm3/s. Considering the end of down sprue to be open to atmosphere and an acceleration due to gravity of 104 mm/s2, the area of the down sprue in mm2 at its end (avoiding aspiration effect) should be
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