1
GATE PI 2004
MCQ (Single Correct Answer)
+2
-0.6
Two identical cylindrical jobs are turned using (a) a round nosed tool of nose radius $$2$$ $$mm$$ and (b) a sharp corner tool having principal cutting edge angle $$ = {45^ \circ }$$ and auxiliary cutting edge angle $$ = {10^ \circ }$$. If the operation is carried out at a feed of $$0.08$$ $$mm/rev,$$ the heights of micro irregularities on the machined surfaces (in $$mm$$) in the two cases will be
A
$$0.0001, 0.024$$
B
$$0.0002, 0.012$$
C
$$0.0003, 0.024$$
D
$$0.0004, 0.012$$
2
GATE PI 2003
MCQ (Single Correct Answer)
+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
MCQ (Single Correct Answer)
+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
MCQ (Single Correct Answer)
+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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