1
GATE ME 2010
MCQ (Single Correct Answer)
+2
-0.6
For the case of molding, it is decided to replace a spherical riser of diameter $$100$$ $$mm$$ by a cylindrical riser. Determine size of the cylindrical riser that will have the identical solidification time. Assume blind risering & ratio of height to radius of cylinder is $$2.$$
A
$$10cm$$
B
$$100$$$$cm$$
C
$$50cm$$
D
$$5$$$$cm$$
2
GATE ME 2010
MCQ (Single Correct Answer)
+2
-0.6
Two steel bars each of diameter $$10mm$$ are coaxially friction welded end to end at an axial pressure of $$200MPa$$ and rotational speed of $$400rpm$$. The coefficient of friction between the mating faces of the rotating bars is $$0.50.$$ The torque is assumed to act at the $$3/{4^{th}}$$ radius of the rotating bar. The power (in $$kW$$) consumed at the interface of the welding is
A
$$12.33$$
B
$$16.44$$
C
$$18.50$$
D
$$24.66$$
3
GATE ME 2010
MCQ (Single Correct Answer)
+2
-0.6
For tool $$A,$$ Taylor’s tool life exponent $$(n)$$ is $$0.45$$ and constant $$(K)$$ is $$90.$$ Similarly for tool $$B,$$ $$n=0.3$$ and $$K=60.$$ The cutting speed (in $$m/min$$) above which tool $$A$$ will have a higher tool life than tool $$B$$ is
A
$$26.7$$
B
$$42.5$$
C
$$80.7$$
D
$$142.9$$
4
GATE ME 2010
MCQ (Single Correct Answer)
+2
-0.6
In a shear cutting operation, a sheet of $$5mm$$ thickness is cut along a length of $$200mm.$$ The cutting blade is $$400mm$$ long and zero-shear $$(S=0)$$ is provided on the edge. The ultimate shear strength of the sheet is $$100$$ $$MPa$$ and penetration to thickness ratio is $$0.2.$$ Neglect friction GATE ME 2010 Production Engineering - Sheet Metal Forming Processes Question 7 English

Assuming force $$Vs$$ displacement curve to be rectangular, the work done in $$J$$ is

A
$$100$$
B
$$200$$
C
$$250$$
D
$$300$$
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