1
GATE PI 1992
MCQ (Single Correct Answer)
+2
-0.6
A hemispherical cup of radius $$'R'$$ is formed in a press working operation. The radius of blank would be
A
$$\sqrt 2 \,\,R$$
B
$$\sqrt 3 \,\,R$$
C
$$\sqrt {{\raise0.5ex\hbox{$\scriptstyle 2$} \kern-0.1em/\kern-0.15em \lower0.25ex\hbox{$\scriptstyle 3$}}} \,\,R$$
D
$$\sqrt {{\raise0.5ex\hbox{$\scriptstyle 3$} \kern-0.1em/\kern-0.15em \lower0.25ex\hbox{$\scriptstyle 2$}}} \,\,R$$
2
GATE PI 1990
MCQ (Single Correct Answer)
+2
-0.6
Calculate the smallest punch diameter that can be designed for piercing sheet metal strip with the following data. Crushing strength of the punch material is $$1500$$ $$MPa.$$ Thickness of the sheet is $$2$$ $$mm,$$ factor of safety is $$3,$$ and shear strength of the sheet material $$500$$ $$MPa$$ is
A
$$2mm$$
B
$$6mm$$
C
$$8mm$$
D
$$24mm$$
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