1
GATE ME 2007
MCQ (Single Correct Answer)
+2
-0.6
A low carbon steel bar of $$147$$ $$mm$$ diameter with length of $$630$$ $$mm$$ is being turned with uncoated carbide insert. The observed tool lives are $$24$$ and $$12$$ for cutting velocities of $$90$$ $$m/min$$ and $$120$$ $$m/min$$ respectively. The feed and depth of cut are $$0.2$$ $$mm/rev$$ and $$2$$ $$mm$$ respectively. Use the unmachined diameter to calculate the cutting velocity.

When tool life is $$20min.$$ The cutting velocity in $$m/min$$ is

A
$$87$$
B
$$97$$
C
$$107$$
D
$$114$$
2
GATE ME 2007
MCQ (Single Correct Answer)
+2
-0.6
A low carbon steel bar of $$147$$ $$mm$$ diameter with length of $$630$$ $$mm$$ is being turned with uncoated carbide insert. The observed tool lives are $$24$$ and $$12$$ for cutting velocities of $$90$$ $$m/min$$ and $$120$$ $$m/min$$ respectively. The feed and depth of cut are $$0.2$$ $$mm/rev$$ and $$2$$ $$mm$$ respectively. Use the unmachined diameter to calculate the cutting velocity.

Neglect over travel or approach of the tool. When tool life is $$20min,$$ the machining time in $$min$$ for a single pass is

A
$$5$$
B
$$10$$
C
$$15$$
D
$$20$$
3
GATE ME 2007
MCQ (Single Correct Answer)
+2
-0.6
In orthogonal turning of a low carbon steel bar of diameter $$150mm$$ with uncoated carbide tool, the cutting velocity is $$90m/min,$$ The feed is $$0.24mm/rev$$ and the depth of cut is $$2mm.$$ The chip thickness obtained is $$0.48$$$$mm.$$ If the orthogonal rake angle is zero, and the principle cutting edge angle is $$90,$$ the shear angle in degrees is
A
$$20.56$$
B
$$26.56$$
C
$$30.56$$
D
$$36.56$$
4
GATE ME 2007
MCQ (Single Correct Answer)
+2
-0.6
In orthogonal turning of medium carbon steel, the specific machining energy is $$2$$ $$kJ/m{m^3},$$ the cutting velocity, feed and depth of cut are $$120m/min,$$ $$0.2mm/rev$$ and $$2mm$$ respectively. The main cutting force $$N$$ is
A
$$40$$
B
$$80$$
C
$$400$$
D
$$800$$
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