1
GATE PI 2017
MCQ (Single Correct Answer)
+2
-0.6
The Merchant circle diagram showing various forces associated with a cutting process using a wedge shaped tool is given in the Figure GATE PI 2017 Machine Tools and Machining - Metal Cutting Question 1 English

The coefficient of friction can be estimated from the ratio

A
$${{{f_1}} \over {{f_2}}}$$
B
$${{{f_3}} \over {{f_4}}}$$
C
$${{{f_5}} \over {{f_6}}}$$
D
$${{{f_6}} \over {{f_5}}}$$
2
GATE PI 2017
Numerical
+2
-0
In a machining operation with turning tool, the tool life $$(T)$$ is related to cutting speed $$v$$ $$(m/s),$$ feed $$f(mm)$$ and depth of cut $$d(mm)$$ as $$$T = C\,v{\,^{ - 2.5}}\,{f^{ - 0.9}}\,{d^{ - 0.15}}$$$
where, $$C$$ is a constant. The suggested values for the cutting parameters are: $$V=1.5$$ $$m/s,$$ $$f=0.25$$ $$mm$$ and $$d=3$$ $$mm$$ for normal rough turning. If the operation is performed at twice the cutting speed and the other parameters remain unchanged, the corresponding percentage change in tool life is ______________.
Your input ____
3
GATE PI 2017
MCQ (Single Correct Answer)
+2
-0.6
A metallic strip having a thickness of $$12$$ $$mm$$ is to be rolled using two steel rolls, each of $$800$$ $$mm$$ diameter. It is assumed that there is no change in width of the strip during rolling. In order to achieve $$10\% $$ reduction in cross-sectional area of the strip after rolling, the angle subtended (in degrees) by the deformation zone at the center of the roll is
A
$$1.84$$
B
$$3.14$$
C
$$6.84$$
D
$$8.23$$
4
GATE PI 2017
Numerical
+1
-0
A steel wire of $$2$$ $$mm$$ diameter is to be drawn from a wire of $$5mm$$ diameter. The value of true strain developed is _____________ (up to three decimal places)
Your input ____
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