1
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
$$16$$
2
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
$$25.22, 23.21$$
3
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
$$250$$ $$m/min$$
4
GATE PI 2002
MCQ (Single Correct Answer)
+2
-0.6
Two different tools $$A$$ and $$B$$ having nose radius of $$0.6mm$$ and $$0.33mm$$ respectively are used to machine $$C-45$$ steel employing feed rate of $$0.2$$ $$mm/rev$$ and $$0.1mm/rev$$ respectively. The tool that gives better finish and the value of ideal surface roughness are
A
Tool $$A$$ and $$4.166$$ $$\mu m$$ respectively
B
Tool $$B$$ and $$3.78$$ $$\mu m$$ respectively
C
Tool $$A$$ and $$8.333$$ $$\mu m$$ respectively
D
Tool $$B$$ and $$8.333$$ $$\mu m$$ respectively
EXAM MAP