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GATE 2019: Manufacturing Quiz 4 -Numericals

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Question 1

During forging of a solid cylinder, the final diameter comes out to be 2 times the initial, the percentage change in height will be _________.

Question 2

In open die forging, a disc of diameter 400 mm and height 100 mm is compressed without any barreling effect. The final diameter of disc 800 mm. The true strain is _________.

Question 3

10 mm diameter holes are to be punched in a steel sheet of 3 mm thickness. Shear strength of the material is 400 N/mm² and penetration is 40%. Shear provided on the punch is 2 mm. The blanking force during the operation will be

Question 4

A rectangular hole of size 100 mm × 50 mm is to be made on a 5 mm thick sheet of steel having ultimate tensile strength and shear strength of 500 MPa and 300 MPa, respectively. The hole is made by punching process. Neglecting the effect of clearance, the punching force (in kN) is

Question 5

By application of tensile force, the cross-sectional area of bar ‘P’ is first reduced by 30% and then by additional 25%. Another bar ‘Q’ of the same material is reduced in cross-sectional area by 50% in single step by applying tensile force. After deformation, the ratio of true strain in bar ‘P’ to bar ‘Q’ will be _____.

Question 6

A round disk of 150 mm diameter is to be blanked from a strip of 3.2mm, half-hard cold rolled steel whose shear strength = 310 MPa.(for half hard cold rolled steel, clearance= 0.075 x thickness).Calculate the blanking force.

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ESE & GATE ME Manufacturing & Engg materials

Jun 19ESE & GATE ME