1
GATE PI 2013
+2
-0.6
In orthogonal turning of a bar of $$100$$ $$mm$$ diameter with a feed of $$0.25$$ $$min/rev,$$ depth of cut of $$4$$ $$mm$$ and cutting velocity of $$90$$ $$m/min,$$ it is observed that the main (tangential) cutting force is prependicular to the friction force acting at the chip-tool interface. The main (tangential) cutting force is $$1500$$ $$N.$$

The normal force acting at the chip-tool interface in $$N$$ is

A
$$1000$$
B
$$1500$$
C
$$2000$$
D
$$2500$$
2
GATE PI 2010
+2
-0.6
During turning of a low carbon steel bar with TiN coated carbide insert, one needs to improve surface finish without sacrificing material removal rate. To achieve improved surface finish one should
A
Decrease nose radius of the cutting tool and increase depth of cut
B
Increase nose radius of the cutting tool
C
Increase feed and reduce nose radius of the cutting tool
D
Increase depth of cut and increase feed
3
GATE PI 2009
+2
-0.6
In an orthogonal machining operation , the tool life obtained is $$10min$$ at a cutting speed of $$10m/min,$$ while at $$75m/min$$ cutting speed, the tool life is $$30min$$. The value of index (n) in the Taylor's tool life equation is
A
$$0.262$$
B
$$0.323$$
C
$$0.423$$
D
$$0.521$$
4
GATE PI 2009
+2
-0.6
An orthogonal operation is carried out at $$20m/min$$ cutting speed, using a cutting tool of rake angle $$15deg$$. The chip thickness is $$0.4mm$$ and uncut chip thickness is $$0.2mm.$$

The shear angle (in degrees) is

A
$$26.8$$
B
$$27.8$$
C
$$28.8$$
D
$$29.8$$
GATE PI Subjects
Fluid Mechanics
Metrology
Theory of Machines
Machine Tools and Machining
Industrial Engineering
Engineering Mechanics
Thermodynamics
Machine Design
Casting
Joining of Materials
Metal Forming
EXAM MAP
Medical
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