1
GATE PI 2003
+5
-1.5
A weld is made using $$MIG$$ welding process with the following welding parameters: Current: $$200A;$$ Voltage: $$25V;$$ Welding speed: $$18$$ $$cm/min;$$ wire diameter: $$1.2$$ $$mm;$$ Wire feed rate: $$4$$ $$m/min;$$ Thermal efficiency of the process: $$65\%$$

The area of cross section of weld bead in $$m{m^2}$$ is:

A
$$16.3$$
B
$$25.1$$
C
$$30.3$$
D
$$38.6$$
2
GATE PI 2003
+2
-0.6
Tool life equation for two tools under consideration are as follows

\eqalign{ & HSS:\,\,\,\,\,\,\,\,\,\,\,\,\,V{T^{0.2}} = 150 \cr & Carbide:\,\,\,\,\,\,V{T^{0.3}} = 250 \cr}
Where $$V$$ is the cutting speed in $$m/min$$ and $$T$$ is the tool life in $$min.$$ The breakdown cutting speed above which the carbide tool will be beneficial is

A
$$54$$ $$m/min$$
B
$$150$$ $$m/min$$
C
$$194$$ $$m/min$$
D
$$250$$ $$m/min$$
3
GATE PI 2003
+2
-0.6
Orthogonal machining of a steel work-piece is done with a $$HSS$$ tool of zero rake angle. The ratio of the cutting force and the thrust force on the tool is $$1:0.372.$$ The length of cut chip is $$4.71$$ $$mm$$ while the uncut chip length is $$10$$ $$mm.$$ What are the shear plane angle $$\phi$$ and friction angle $$\beta$$ in deg.? Use Merchant's theory.
A
$$32.49, 10.22$$
B
$$25.22, 20.41$$
C
$$64.78, 20.41$$
D
$$25.22, 23.21$$
4
GATE PI 2003
+2
-0.6
A single point cutting tool with a nose radius of $$0.4$$ $$mm$$ was used to turn a component in a lathe employing a feed rate of $$0.3$$ $$mm/rev.$$ If the feed-rate is doubled, the ideal surface roughness (peak-to-valley height) produced on the component will increase by a factor of
A
$$2$$
B
$$4$$
C
$$8$$
D
$$16$$
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