1
GATE ME 2014 Set 2
+2
-0.6
A rectangular hole of size $$100\,\,mm \times 50\,\,mm$$ 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
A
$$300$$
B
$$450$$
C
$$600$$
D
$$750$$
2
GATE ME 2012
+2
-0.6
Calculate the punch size in $$mm,$$ for a circular blanking 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 $$0.05$$ $$mm$$

A
$$24.83$$
B
$$24.89$$
C
$$25.01$$
D
$$25.17$$
3
GATE ME 2011
+2
-0.6
The shear strength of a sheet metal is $$300MPa.$$ The blanking force required to produce a blank of $$100$$ $$mm$$ diameter from a $$1.54$$ $$mm$$ thick sheet is close to
A
$$45kN$$
B
$$70kN$$
C
$$141kN$$
D
$$3500kN$$
4
GATE ME 2010
+2
-0.6
In a shear cutting operation, a sheet of $$5mm$$ thickness is cut along a length of $$200mm.$$ The cutting blade is $$400mm$$ long and zero-shear $$(S=0)$$ is provided on the edge. The ultimate shear strength of the sheet is $$100$$ $$MPa$$ and penetration to thickness ratio is $$0.2.$$ Neglect friction

Assuming force $$Vs$$ displacement curve to be rectangular, the work done in $$J$$ is

A
$$100$$
B
$$200$$
C
$$250$$
D
$$300$$
GATE ME Subjects
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Medical
NEET