1
GATE ME 2000
+2
-0.6
A conventional lathe and a $$CNC$$ lathe are under consideration for machining a given part. The relevant data are shown below :

The machine preferred for producing $$100$$ pieces is

A
Conventional lathe
B
$$CNC$$ lathe
C
Any of the above
D
None
2
GATE ME 1999
+2
-0.6
What is the approximate $$\%$$ change in the life, $$t,$$ of the tool with zero rake angle used in orthogonal cutting when its clearance angle, $$\alpha ,$$ is changed from $$10$$ to $$7$$ deg?

(Hint: flank wear rate is proportional to $$\cot \,\alpha$$)

A
$$30\%$$ increase
B
$$30\%$$ decrease
C
$$70\%$$ increase
D
$$70\%$$ decrease
3
GATE ME 1998
+2
-0.6
In orthogonal machining operation, the chip thickness and the uncut chip thickness are equal to $$0.45mm$$. If the tool rake angle is $$0$$ deg. The shear plane angle is
A
$$45$$
B
$$30$$
C
$$18$$
D
$$60$$
4
GATE ME 1997
+2
-0.6
In a typical metal cutting operation, using a cutting tool of positive rake $$\gamma = 10\deg ,$$ it was observed that the shear angle was $$20deg$$. The friction angle is
A
$$45$$
B
$$30$$
C
$$60$$
D
$$40$$
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CBSE
Class 12