1
GATE PI 2011
+2
-0.6
Match the following materials with their most appropriate application:
A
$$1 - P,\,\,2 - R,\,\,3 - Q,\,\,4 - S$$
B
$$1 - P,\,\,2 - R,\,\,3 - S,\,\,4 - Q$$
C
$$1 - S,\,\,2 - Q,\,\,3 - P,\,\,4 - R$$
D
$$1 - S,\,\,2 - R,\,\,3 - P,\,\,4 - Q$$
2
GATE PI 2011
+2
-0.6
During orthogonal machining of a mild steel specimen with a cutting tool of zero rake angle, the following data is obtained:
Uncut chip thickness $$=0.25$$ $$mm$$
Chip thickness $$=0.75$$ $$mm$$
Width of cut $$=2.5$$ $$mm$$
Normal force $$=950$$ $$N$$
Thrust force $$=475$$ $$N$$

The shear angle and shear force, respectively, are

A
$${71.565^ \circ },\,\,150.12N$$
B
$${9.218^ \circ },\,\,861.64N$$
C
$${18.435^ \circ },\,\,751.04N$$
D
$${23.157^ \circ },\,\,686.66N$$
3
GATE PI 2011
+2
-0.6
During orthogonal machining of a mild steel specimen with a cutting tool of zero rake angle, the following data is obtained:
Uncut chip thickness $$=0.25$$ $$mm$$
Chip thickness $$=0.75$$ $$mm$$
Width of cut $$=2.5$$ $$mm$$
Normal force $$=950$$ $$N$$
Thrust force $$=475$$ $$N$$

The ultimate shear stress (in $$N/m{m^2}$$) of the work material is

A
$$235$$
B
$$139$$
C
$$564$$
D
$$380$$
4
GATE PI 2011
+2
-0.6
The thickness of a plate is reduced from $$30$$ $$mm$$ to $$10$$ $$mm$$ by successive cold rolling passes using identical rolls of diameter $$600$$ $$mm.$$ Assume that there is no change in width. If the coefficient of friction between the rolls and the work piece is $$0.1,$$ the minimum number of passes required is
A
$$3$$
B
$$4$$
C
$$6$$
D
$$7$$
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