GATE PI 2003 | Sheet Metal Forming Processes Question 25 | Metal Forming

GATE PI 2003

MCQ (Single Correct Answer)

-0.6

A hydraulic press is used to produce circular blanks of $$10$$ $$mm$$ diameter from a sheet of $$2$$ $$mm$$ thickness. If the shear strength of the sheet material is $$400$$ $$N/m{m^2},$$ the force required for producing a circular blank is

$$8$$ $$kN$$

$$25.13$$ $$kN$$

$$31.42$$ $$kN$$

$$125.66$$ $$kN$$

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

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

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

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

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