1
GATE ME 2001
MCQ (Single Correct Answer)
+2
-0.6
During orthogonal cutting of mild steel with a $$10$$ degrees rake angle tool the chip thickness ratio was obtained as $$0.4.$$ The shear angle (in degrees) evaluated from this data is
A
$$6.53$$
B
$$20.22$$
C
$$22.94$$
D
$$50.00$$
2
GATE ME 2001
MCQ (Single Correct Answer)
+2
-0.6
For turning $$NiCr$$ alloy steel at cutting speeds of $$64m/min$$ and $$100m/min,$$ the respective tool lives are $$15min$$ and $$12$$ $$min.$$ The tool life for a cutting speed of $$144m/min$$ is
A
$$8$$ min
B
$$9$$ min
C
$$10$$ min
D
$$11.5$$ min
3
GATE ME 2000
MCQ (Single Correct Answer)
+2
-0.6
A conventional lathe and a $$CNC$$ lathe are under consideration for machining a given part. The relevant data are shown below : GATE ME 2000 Production Engineering - Metal Cutting Question 65 English

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

A
Conventional lathe
B
$$CNC$$ lathe
C
Any of the above
D
None
4
GATE ME 1999
MCQ (Single Correct Answer)
+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
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