GATE PI 2006 | Metal Forming Process Question 30 | Metal Forming

GATE PI 2006

MCQ (Single Correct Answer)

-0.6

A solid cylindrical stainless steel work piece of $$200mm$$ diameter and $$150mm$$ height. This component is reduced by $$50\% $$ in height with flat die in open die forging. Assuming the flow stress of the material as $$1000$$ $$MPa$$ and the coefficient of friction to be $$0.2,$$ the estimated forging force at the end of the stroke is

$$20.8$$ $$kN$$

$$31$$ $$kN$$

$$78.6$$ $$kN$$

$$78.6$$ $$MN$$

GATE PI 2005

MCQ (Single Correct Answer)

-0.6

Consider the following statements:
In comparison to hot working, in cold working,
$$1.$$ Higher forces are required
$$2.$$ No heating is required
$$3.$$ Less ductility is required
$$4.$$ Better surface finish is obtained.

Which of the statements given above are correct?

$$1,$$ $$2$$ and $$3$$

$$1,$$ $$2$$ and $$4$$

$$1$$ and $$3$$

$$2,$$ $$3$$ and $$4$$

GATE PI 2005

MCQ (Single Correct Answer)

-0.6

Assertion (A) : Cold working of metals result in increase of strength and hardness.
Reason (R) : Cold working reduces the total number of dislocations per unit volume of the material.

Both $$A$$ and $$R$$ are individually true and $$R$$ is the correct explanation of $$A$$

Both $$A$$ and $$R$$ are individually true but $$R$$ is not the correct explanation of $$A$$

$$A$$ is true but $$R$$ is false

$$A$$ is false but $$R$$ is true

GATE PI 2005

MCQ (Single Correct Answer)

-0.6

The true stress-true strain curve is given by $$\sigma = 1400\,{\varepsilon ^{0.33}},$$ where the stress $$\sigma $$ is in $$MPa.$$ The true stress at maximum load (in $$MPa$$) is

$$971$$

$$750$$

$$698$$

$$350$$

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