Mechanical Gate Subject

Aptitude and Reasoning Engineering Mathematics Engineering Mechanics Manufacturing Thermodynamics Industrial Engineering Material Science Vibrations Machine Theory Heat Transfer Strength of Material

Manufacturing Mechanical previous year questions with answer

1 2 3 4 5 6 7 8 9 10

Ques 31 GATE 2017 SET-2

A strip of 120 mm width and 8 mm thickness is rolled between two 300 mm-diameter rolls to get a strip of 120 mm width and 7.2 mm thickness. The speed of the strip at the exit is 30 m/min. There is no front or back tension. Assuming uniform roll pressure of 200 MPa in the roll bite and 100% mechanical efficiency, the minimum total power (in kW) required to drive the two rolls is ________.

9.3 is the correct answer.

Ques 32 GATE 2017 SET-2

During the turning of a 20 mm-diameter steel bar at a spindle speed of 400 rpm, a tool life of 20 minute is obtained. When the same bar is turned at 200 rpm, the tool life becomes 60 minute. Assume that Taylor's tool life equation is valid. When the bar is turned at 300 rpm, the tool life (in minute) is approximately

Ques 33 GATE 2017 SET-2

In an orthogonal machining with a tool of 9° orthogonal rake angle, the uncut chip thickness is 0.2 mm. The chip thickness fluctuates between 0.25 mm and 0.4 mm. The ratio of the maximum shear angle to the minimum shear angle during machining is ________.

1.49 is the correct answer.

Ques 34 GATE 2017 SET-1

In a metal forming operation when the material has just started yielding, the principal stresses are σ₁ = +180 MPa, σ₂ = -100 MPa, σ₃ = 0. Following von Mises' criterion, the yield stress is ________ MPa.

245.8 is the correct answer.

Ques 35 GATE 2017 SET-1

Match the processes with their characteristics.

Process	Characteristics
P: Electrical Discharge Machining	1. No residual stress
Q: Ultrasonic machining	2. Machining of electrically conductive materials
R: Chemical machining	3. Machining of glass
S: Ion Beam Machining	4. Nano-machining

P-2, Q-3, R-1, S-4

P-3, Q-2, R-1, S-4

P-3, Q-2, R-4, S-1

P-2, Q-4, R-3, S-1

Ques 36 GATE 2017 SET-1

In an arc welding process, welding speed is doubled. Assuming all other process parameters to be constant, the cross sectional area of the weld bead will

increase by 25%

increase by 50%

reduce by 25%

reduce by 50%

Ques 37 GATE 2017 SET-1

Metric thread of 0.8 mm pitch is to be cut on a lathe. Pitch of the lead screw is 1.5 mm. If the spindle rotates at 1500 rpm, the speed of rotation of the lead screw (rpm) will be ________.

800 is the correct answer.

Ques 38 GATE 2017 SET-1

A 10 mm deep cylindrical cup with diameter of 15 mm is drawn from a circular blank. Neglecting the variation in the sheet thickness, the diameter (upto 2 decimal points accuracy) of the blank is ________ mm.

28.72 is the correct answer.

Ques 39 GATE 2017 SET-1

Circular arc on a part profile is being machined on a vertical CNC milling machine. CNC part program using metric units with absolute dimensions is listed below:
N60 G01 X 30 Y 55 Z-5 F50
N70 G02 X 50 Y 35 R 20
N80 G01 Z5
The coordinates of the centre of the circular arc are:

(30, 55)

(50, 55)

(50, 35)

(30, 35)

Ques 40 GATE 2017 SET-1

A block of length 200 mm is machined by a slab milling cutter 34 mm in diameter. The depth of cut and table feed are set at 2 mm and 18 mm/minute, respectively. Considering the approach and the over travel of the cutter to be same, the minimum estimated machining time per pass is ________ minutes.

12 is the correct answer.