Manufacturing Mechanical previous year questions with answer

Ques 1 GATE 2022 SET-2

A shaft of diameter is assembled in a hole of diameter . Match the allowance and limit parameter in Column I with its corresponding quantitative value in Column II for this shaft-hole assembly.

Ques 2 GATE 2022 SET-2

Which one of the following CANNOT impart linear motion in a CNC machine?

Ques 3 GATE 2022 SET-2

Consider sand casting of a cube of edge length a. A cylindrical riser is placed at the top of the casting. Assume solidification time, t_s ∝ V/A, where V is the volume and A is the total surface area dissipating heat. If the top of the riser is insulated, which of the following radius/radii of riser is/are acceptable?

Ques 4 GATE 2022 SET-2

Which of these processes involve(s) melting in metallic workpieces?

Ques 5 GATE 2022 SET-2

Parts P1-P7 are machined first on a milling machine and then polished at a separate machine. Using the information in the following table, the minimum total completion time required for carrying out both the operations for all 7 parts is __________ hours.

Ques 6 GATE 2022 SET-2

A cylindrical billet of 100 mm diameter and 100 mm length is extruded by a direct extrusion process to produce a bar of L-section. The cross sectional dimensions of this L-section bar are shown in the figure. The total extrusion pressure (𝑝) in MPa for the above process is related to extrusion ratio (𝑟) as

where σ₀ is the mean flow strength of the billet material in MPa, l is the portion of the billet length remaining to be extruded in mm, d₀ is the initial diameter of the billet in mm, and K₀ is the die shape factor.

If the mean flow strength of the billet material is 50 MPa and the die shape factor is 1.05, then the maximum force required at the start of extrusion is ________ kN (round off to one decimal place).

Ques 7 GATE 2022 SET-2

A straight-teeth horizontal slab milling cutter is shown in the figure. It has 4 teeth and diameter (D) of 200 mm. The rotational speed of the cutter is 100 rpm and the linear feed given to the workpiece is 1000 mm/minute. The width of the workpiece (w) is 100 mm, and the entire width is milled in a single pass of the cutter. The cutting force/tooth is given by F = Kt_cw, where specific cutting force K = 10 N/mm², w is the width of cut, and t_c is the uncut chip thickness.
The depth of cut (d) is D/2, and hence the assumption of d/D<<1 is invalid. The maximum cutting force required is ______ KN (round off to one decimal place).

Ques 8 GATE 2022 SET-2

In an orthogonal machining operation, the cutting and thrust forces are equal in magnitude. The uncut chip thickness is 0.5 mm and the shear angle is 15°. The orthogonal rake angle of the tool is 0° and the width of cut is 2 mm. The workpiece material is perfectly plastic and its yield shear strength is 500 MPa. The cutting force is _______ N (round off to the nearest integer)

Ques 9 GATE 2022 SET-2

The best size wire is fitted in a groove of a metric screw such that the wire touches the flanks of the thread on the pitch line as shown in the figure. The pitch (𝑝) and included angle of the thread are 4 mm and 60º, respectively.The diameter of the best size wire is ___________ mm (round off to 2 decimal places).

Ques 10 GATE 2022 SET-2

In an direct current arc welding process, the power source has an open circuit voltage of 100 V and short circuit current of 1000 A. Assume a linear relationship between voltage and current. The arc voltage (V) varies with the arc length (l) as V = 10 + 5l, where V is in volts and l is in mm. The maximum available arc power during the process is _________ kVA (in integer).