Manufacturing Mechanical previous year questions with answer

Ques 11 GATE 2022 SET-1

A square threaded screw is used to lift a load W by applying a force F. Efficiency of the square threaded screw is expressed as?

Ques 12 GATE 2022 SET-1

A CNC worktable is driven in a linear direction by a lead screw connected directly to a stepper motor. The pitch of the lead screw is 5 mm. The stepper motor completes one full revolution upon receiving 600 pulses. If the worktable speed is 5 m/minute and there is no missed pulse, then the pulse rate being received by the stepper motor is?

Ques 13 GATE 2022 SET-1

The type of fit between a mating shaft of diameter 25.0 mm and a hole of diameter 25.015 mm is __________.

Ques 14 GATE 2022 SET-1

Which of the following heat treatment processes is/are used for surface hardening of steels?

Ques 15 GATE 2022 SET-1

Which of the following additive manufacturing technique(s) can use a wire as a feedstock material?

Ques 16 GATE 2022 SET-1

Electrochemical machining operations are performed with tungsten as the tool, and copper and aluminum as two different workpiece materials. Properties of copper and aluminum are given in the table below.

Ques 17 GATE 2022 SET-1

Under orthogonal cutting condition, a turning operation is carried out on a metallic workpiece at a cutting speed of 4 m/s. The orthogonal rake angle of the cutting tool is 5º. The uncut chip thickness and width of cut are 0.2 mm and 3 mm, respectively. In this turning operation, the resulting friction angle and shear angle are 45º and 25º, respectively. If the dynamic yield shear strength of the workpiece material under this cutting condition is 1000 MPa, then the cutting force is ______________ N (round off to one decimal place).

Ques 18 GATE 2022 SET-1

A 1 mm thick cylindrical tube, 100 mm in diameter, is orthogonally turned such that the entire wall thickness of the tube is cut in a single pass. The axial feed of the tool is 1 m/minute and the specific cutting energy (u) of the tube material is 6 J/mm³. The power required to carry out this operation is _________ kW (round off to one decimal place).

Ques 19 GATE 2022 SET-1

A 4 mm thick aluminum sheet of width w = 100 mm is rolled in a two-roll mill of roll diameter 200 mm each. The workpiece is lubricated with a mineral oil, which gives a coefficient of friction, µ=0.1. The flow stress (𝜎 ) of the material in MPa is 𝜎 =207+414 𝜀, where 𝜀 is the true strain. Assuming rolling to be a plane strain deformation process, the roll separation force (F) for maximum permissible draft (thickness reduction) is _________ kN (round off to the nearest integer).
Use:
is average flow stress, 𝐿 is roll-workpiece contact length, and ℎ J is the average sheet thickness.

Ques 20 GATE 2022 SET-1

Two mild steel plates of similar thickness, in butt-joint configuration, are welded by gas tungsten arc welding process using the following welding parameters: