GATE PI 2002 | Sheet Metal Forming Processes Question 27 | Metal Forming

GATE PI 2002

MCQ (Single Correct Answer)

-0.6

In sheet metal working, the spring back increase when
$$P:$$ Ratio of bend radius to sheet thickness is small
$$Q:$$ Young's modulus of the sheet is low
$$R:$$ Yield strength of the sheet is high
$$S:$$ Tension is applied during bending

$$P, Q, R$$

$$Q, R$$

$$P, Q, S$$

GATE PI 1994

MCQ (Single Correct Answer)

-0.6

In metal forming operation, the true strain in the $$X$$-direction is $$0.3$$ and in the $$Y$$-direction is $$-0.1.$$ The true strain in the $$Z$$-direction is

$$0$$

$$-0.2$$

$$0.2$$

$$-0.03$$

GATE PI 1992

MCQ (Single Correct Answer)

-0.6

A hemispherical cup of radius $$'R'$$ is formed in a press working operation. The radius of blank would be

$$\sqrt 2 \,\,R$$

$$\sqrt 3 \,\,R$$

$$\sqrt {{\raise0.5ex\hbox{$\scriptstyle 2$} \kern-0.1em/\kern-0.15em \lower0.25ex\hbox{$\scriptstyle 3$}}} \,\,R$$

$$\sqrt {{\raise0.5ex\hbox{$\scriptstyle 3$} \kern-0.1em/\kern-0.15em \lower0.25ex\hbox{$\scriptstyle 2$}}} \,\,R$$

GATE PI 1990

MCQ (Single Correct Answer)

-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

$$2mm$$

$$6mm$$

$$8mm$$

$$24mm$$