GATE PI Advanced Manufacturing PYQs & Answers — Page 2

Questions 11–19 of 19. Imported answers require independent review unless marked reviewed.

A 3 mm thick steel sheet, kept at room temperature of 30 °C, is cut by a fiber laser beam. The laser spot diameter on the top surface of the sheet is 0.2 mm. The laser absorptivity of the sheet is 50%. The properties of steel are density = 8000 kg/m³, specific heat = 500 J/kg°C, melting temperature = 1530 °C, and latent heat of fusion = 3×10⁵ J/kg. Assume that melting efficiency is 100% and that the kerf width is equal to the laser spot diameter. The maximum speed (in m/s) at which the sheet can be fully cut at 2 kW laser power is ________. [round off to 3 decimal places]

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A non-traditional machining process which utilizes mechanical energy as the principal energy source for removing the material is

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Electric discharge machining

Laser beam machining

Ultrasonic machining

Plasma arc machining

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In a waterjet machining process, the water pressure used is 500 MPa. The diameter of orifice of the nozzle through which the waterjet comes out is 0.25 mm. Neglecting frictional and other losses, and using the density of water as 1000 kg/m

, the mass flow rate of the waterjet (rounded off to two decimal places) in kg/min is ____________.

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For the abrasive jet machining process, the ratio of abrasive volume to carrier gas volume is 0.25. Further, the ratio of abrasive density to carrier gas density is 25. The mass ratio of abrasive to the mixture of abrasive and carrier gas is _____ (round off to 2 decimal places)

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A CO₂ laser in continuous mode is used for drilling a plate. The process parameters and their values are:

Parameter	Value
Laser power intensity	W/mm²
Vaporization energy	J/mm³
Efficiency of the process	15%
Laser spot diameter	200 micrometer

The drilled depth (in mm) after 2 seconds is ______

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To make holes of 0.5 mm diameter and 30 mm depth in a mild steel component, the most suitable process is

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chemical machining

electrochemical machining

abrasive jet machining

plasma arc machining

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In an electrochemical machining of aluminium with plane parallel electrodes, the current density is 70 A/cm

. Cross-sectional area of each electrode is 3 cm

. The current efficiency (i.e., the fraction of current used for dissolution of metal) is 80%. Gram atomic weight, valency and density of aluminium are 27 gram, 3 and 2700 kg/m

, respectively. Take Faraday’s constant as 96500 Coulomb. The volumetric material removal rate (in mm

/min) is _____

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In chemical machining, the etch factor is expressed as

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A surface of 30 mm × 30 mm of an iron block is machined using electrochemical machining process. The atomic weight and valency of iron is 55.85 and 2, respectively. The density of iron is 7,860 kg/m

. If input current is 1,000 A and Faraday’s constant is 96,540 Coulombs, then the feed rate (in mm/min) is (up to two decimal places).

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GATE PI Advanced Manufacturing PYQs

Question 48

Question 17

Question 48

Question 20

Question 50

Question 13

Question 53

Question 14

Question 42