1
GATE PI 1994
MCQ (Single Correct Answer)
+5
-1.5
Parting-off operation is carried out on a cylindrical work-piece of $$100mm$$ diameter. The groove width is $$2$$ $$mm$$ and an in feed of $$0.2$$ $$mm$$ per revolution is given at a maximum cutting speed of $$60$$ $$m/mm.$$ The specific cutting force for the material is $$800\,\,N/m{m^2}.$$

The tangential force on the tool is

A
$$160$$ $$N$$
B
$$320$$ $$N$$
C
$$480$$ $$N$$
D
$$640$$ $$N$$
2
GATE PI 1994
MCQ (Single Correct Answer)
+5
-1.5
Parting-off operation is carried out on a cylindrical work-piece of $$100mm$$ diameter. The groove width is $$2$$ $$mm$$ and an in feed of $$0.2$$ $$mm$$ per revolution is given at a maximum cutting speed of $$60$$ $$m/mm.$$ The specific cutting force for the material is $$800\,\,N/m{m^2}.$$

The maximum power requirement for the operation is

A
$$80$$ $$W$$
B
$$100$$ $$W$$
C
$$200$$ $$W$$
D
$$320$$ $$W$$
3
GATE PI 1994
Subjective
+5
-0
A part can be machined in $$30$$ minutes on an engine lathe where as it can be machined in $$6$$ minutes on a turret lathe. However, it would cost additionally Rs. $$500$$ to tool up the turret lathe for the operation. If the hourly rate including labour and overhead is Rs. $$80$$ for the engine lathe and Rs. $$160$$ for the turret lathe, The minimum number of parts required to make the turret lathe more economical to use, for the operation
4
GATE PI 1994
MCQ (Single Correct Answer)
+5
-1.5
In an orthogonal cutting operation, the cutting velocity is $$30$$ $$m/min$$ and the chip velocity $$15$$ $$m/min.$$ If the rake angle of the tool is $${10^0}$$.

Shear velocity with the help of a velocity triangle.

A
$$7.5$$ $$m/min$$
B
$$12$$ $$m/min$$
C
$$25$$ $$m/min$$
D
$$31$$ $$m/min$$
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