Previous Years GATE Questions on Forming Process 2007-2013

Solved GATE Questions on Forming Process

Question 1. The force requirement in a blanking operation of low carbon steel sheet is 5.0 kN. The thickness of the sheet is ‘t’ and diameter of the blanked part is ‘d’. For the same work material, if the diameter of the blanked part is increased to 1.5 d and thickness is reduced to 0.4 t, the new blanking force in kN is

(A) 3.0

(B) 4.5

(C) 5.0

(D) 8.0

GATE-ME-2007

Hint

Question 2. Match the correct combination for following metal working processes.

 

(A) P-2,  Q-1,  R-3,  S-4

(B) P-3, Q-4,  R-1,  S-5

(C) P-5, Q-4, R-3, S-1

(D) P-3, Q-1, R-2, S-4

GATE-ME-2007

Hint

Question 3. The thickness of a metallic sheet is reduced from an initial value of 16 mm to a final value 10 mm in one single pass rolling with a pair of cylindrical rollers each of diameter 400 mm. The true strain is

(A) 5.936

(B) 7.936

(C) 8.936

(D) 9.936

GATE-ME-2007

Hint

Question 4. In open-die forging, a disc of diameter 200 mm and height 60 mm is compressed without any barreling effect. The final diameter of the disc is 400 mm. The true strain is

(A) 1.986

(B) 1.686

(C) 1.386

(D) 0.602

GATE-ME-2007

Hint

Question 5. In the deep drawing of cups, blanks show a tendency to wrinkle up around the periphery (flange).

The most likely cause and remedy  of the phenomenon are, respectively,

(A) Buckling due to circumferential compression; Increase blank holder pressure

(B) High blank holder pressure and high friction; Reduce blank holder pressure and apply lubricant

(C) High temperature causing increase in circumferential length; Applt coolant to blank

(D) Buckling due to circumferential compression; decrease blank holder pressure

GATE-ME-2008

Hint

Question 6. In a single pass rolling operation, a 20 mm thick plate width of 100 mm, is reduced to 18 mm. the roller radius is 250 mm and rotational speed is 10 rpm. The average flow stress for the plate material is 300 MPa. The power required for the rolling operation in kW is closest to

(A)15.2

(B) 18.2

(C) 30.4

(D) 45.6

GATE-ME-2008

Hint

Statement for linked Answer Questions 7 and 8:

In shear cutting operation, a sheet of 5mm thickness is cut along a length of 200 mm. the cutting blade is 400 mm (see figure) and zero –shear (S=0) is provided on the edge. The ultimate shear strength of the sheet is 100MPa and penetration to thickness ratio is 0.2. Neglect friction.

Question 7. Assume force vs displacement curve to be rectangular, work done (in J) is

(A) 100

(B) 200

(C) 250

(D) 300

GATE-ME-2010

Hint

Question 8. A shear of 20 mm (S=20 mm) is now provided on the blade. Assume force vs displacement curve to be trapezoidal, the maximum force (kN) exerted is

(A) 5

(B) 10

(C) 20

(D) 40

GATE-ME-2010

Hint

Question 9. The shear strength of a sheet metal is 300 MPa. The blanking force required to produce a blank of 100 mm diameter from a 1.5 mm thick sheet is close to

(A) 45 kN

(B) 70 kN

(C) 141 kN

(D) 3500 kN

GATE-ME-2011

Hint

Question 10. The maximum possible draft in cold rolling of sheet increases with the

(A) Increase in coefficient of friction

(B) Decrease in coefficient of friction

(C) Decrease in roll radius

(D) increase in roll velocity

GATE-ME-2011

Hint

Question 11. In a rolling process, the state of stress of the material undergoing deformation is

(A) Pure compression

(B) Pure shear

(C) Compression and shear

(D) Tension and shear

GATE-ME-2013

Hint

Answer Keys