1

GATE PI 1989

Fill in the Blanks

+1

-0

At the last hammer stroke the excess material from the finishing cavity of a forging die is pushed into .............

2

GATE PI 1989

Subjective

+5

-0

In a wire drawing operation diameter of $$6mm$$ is reduced in stages to a diameter of $$1.34mm.$$ Assuming ideally rigid plastic material and ideally lubricant condition,

$$i)$$$$\,\,\,\,\,\,\,$$ The minimum number of passes required by assuming max reduction per pass

$$\,\,\,\,\,\,\,\,\,\,\,\,$$ is obtained with $$\mu = 0.2$$ and half die angle as $${6^0}$$. If the flow strength of the

$$\,\,\,\,\,\,\,\,\,\,\,\,$$ material is $$60$$ $$MPa.$$

$$i)$$$$\,\,\,\,\,\,\,$$ The minimum number of passes required by assuming max reduction per pass

$$\,\,\,\,\,\,\,\,\,\,\,\,$$ is obtained with $$\mu = 0.2$$ and half die angle as $${6^0}$$. If the flow strength of the

$$\,\,\,\,\,\,\,\,\,\,\,\,$$ material is $$60$$ $$MPa.$$

$$ii)$$$$\,\,\,\,\,$$ The diameter of wire after $${2^{nd}}$$ stage

3

GATE PI 1989

MCQ (Single Correct Answer)

+1

-0.3

Flatness of slip gages is checked with

4

GATE PI 1989

MCQ (Single Correct Answer)

+2

-0.6

Outside diameter of bush is turned using a mandrel. The mandrel diameter is maintained as $${30^{\matrix{
{ + 0.000} \cr
{ - 0.050} \cr
} }}\,\,mm$$ and the bore diameter is $${30^{\matrix{
{ + 0.050} \cr
{ - 0.000} \cr
} }}\,\,mm$$. The maximum value in $$mm$$ of the eccentricity on the bush due to the locating mandrel

Paper analysis

Total Questions

Casting

8

Joining of Materials

3

Machine Tools and Machining

8

Metal Forming

4

Metrology

2

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