1
GATE PI 2004
+2
-0.6
A hole of $$40$$ $$mm$$ diameter is pierced in a steel sheet of $$4$$ $$mm$$ thickness without shear on the tool. Shear strength of steel is $$400$$ $$N/m{m^2},$$ and penetration is $$25\% .$$ What is the expected percentage load reduction if a shear of $$1$$ $$mm$$ is provided on the punch?
A
$$25.00$$
B
$$33.33$$
C
$$50.00$$
D
$$66.67$$
2
GATE PI 2004
+2
-0.6
Determine the load required to punch a $$20$$ $$mm$$ diameter hole in $$2$$ $$mm$$ thick sheet. The properties of the material of the sheet are:
Tensile strength $$-580$$ $$MPa;$$
Yield strength in tension $$-410$$ $$MPa$$
Shear strength $$-350$$ $$MPa;$$
Yield strength in shear $$-250$$ $$MPa$$

The load in $$kN$$ is:

A
$$31.40$$
B
$$43.98$$
C
$$64.40$$
D
$$91.10$$
3
GATE PI 2004
+2
-0.6
In deep drawing of sheet metal, spring loaded stripper clamps the work until:
A
The punch penetrates twice the stock thickness
B
It removes wrinkles on the product edges
C
Shedder removes the work from the tools
D
Punch is completely withdrawn from the work material
4
GATE PI 2004
+2
-0.6
In an interchangeable assembly, a shaft of $${20.00^{\matrix{ { - 0.015} \cr { - 0.005} \cr } }}\,\,mm$$ diameter and a hole of $${20.00^{\matrix{ { - 0.025} \cr { - 0.010} \cr } }}\,\,mm$$ diameter form a mating pair. In the worst assembly conditions, the clearance between them will be
A
$$40$$ microns
B
$$30$$ microns
C
$$25$$ microns
D
$$15$$ microns
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