1
GATE ME 2014 Set 3
Numerical
+2
-0
For spot welding of two steel sheets (base metal) each of $$3$$ $$mm$$ thickness, welding current of $$10000$$ $$A$$ is applied for $$0.2$$ $$s$$. The heat dissipated to the base metal is $$1000J.$$ Assuming that the heat required for melting $$1m{m^3}$$ volume of steel is $$20J$$ and interfacial contact resistance between sheets is $$0.0002$$$$\Omega $$, the volume (in $$m{m^3}$$) of weld nugget is _____________
Your input ____
2
GATE ME 2014 Set 3
Numerical
+1
-0
A straight turning operation is carried out using a single point cutting tool on an $$AISI$$ $$1020$$ steel rod. The feed is $$0.2$$ $$mm/rev$$ and the depth of cut is $$0.5$$ $$mm.$$ The tool has a side cutting edge angle of $${60^ \circ }.$$ The uncut chip thickness (in $$mm$$) is _______________
Your input ____
3
GATE ME 2014 Set 3
MCQ (Single Correct Answer)
+1
-0.3
Cutting tool is much harder than the work piece. Yet the tool wears out during the tool-work interaction, because
A
Extra hardness is imparted to the work piece due to coolant used
B
Oxide layers on the work piece surface impart extra hardness to it
C
Extra hardness is imparted to the work piece due to severe rate of strain
D
Vibration is induced in the machine tool
4
GATE ME 2014 Set 3
MCQ (Single Correct Answer)
+2
-0.6
Which pair of following statement is correct for orthogonal cutting using a single-point cutting tool?
$$P.$$ reduction in friction angle increases cutting force
$$Q.$$ Reduction in friction angle decreases cutting force
$$R.$$ Reduction in friction angle increases chip thickness
$$S.$$ Reduction in friction angle decreases chip thickness
A
$$P$$ and $$R$$
B
$$P$$ and $$S$$
C
$$Q$$ and $$R$$
D
$$Q$$ and $$S$$
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