1
GATE PI 2009
MCQ (Single Correct Answer)
+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
$$0.521$$
2
GATE PI 2009
MCQ (Single Correct Answer)
+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
$$29.8$$
3
GATE PI 2009
MCQ (Single Correct Answer)
+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 chip velocity (in $$m/min$$) is

A
$$8$$
B
$$10$$
C
$$12$$
D
$$14$$
4
GATE PI 2009
MCQ (Single Correct Answer)
+2
-0.6
The total angular movement (in degrees) of a lead screw with a pitch of $$5.0mm$$ to drive the work table by a distance of $$200mm$$ in a $$NC$$ machine is
A
$$14400$$
B
$$28800$$
C
$$57600$$
D
$$72000$$
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