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GATE ME 2021 || Manufacturing Quiz 3

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Question 1

A brass billet is to be extruded from its initial diameter of 100 mm to a final diameter of 50 mm. The working temperature of 700 °C and the extrusion constant is 250 MPa. The force required for extrusion is

Question 2

Calculate the punch size in mm, for a circular blinking operation for which details are given below
Size of the blank 25 mm
Thickness of the sheet 2 mm
Radial clearance between punch and die 0.06 mm
Die allowance 0.05 mm

Question 3

In a rolling process, thickness of a strip is reduced from 4 mm to 2 mm using 300 mm diameter rolls rotating at 100 rpm. The velocity of the strip (in m/sec) at the neutral point is __________.

Question 4

A block made of perfectly plastic material with a yield stress of 260 MPa in simple tension has the diameter 200 mm × 100 mm × 150 mm (b × h × w) at one instant during plane strain forging. Assuming there is sticking friction, the peak pressure will be

Question 5

In a slab rolling operation, the maximum thickness reduction is given by , where R is the radius of the roll and µ is the coefficient of friction between the roll and the sheet. If , the maximum angle subtended by the deformation zone at the centre of the roll (bite angle in degrees) is_____

Question 6

Which of the following assumption are taken during forming in slab method?
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Jan 11ESE & GATE ME