1
GATE PI 1995
+5
-1.5
In an orthogonal machining experiment using a tool having $${6^ \circ }.$$ Rake angle, the following data were collected. Cutting speed $$0.5$$ $$m/sec,$$ width of cut $$3$$ $$mm,$$ depth of cut $$1mn,$$ chip thickness $$1.5mm.$$ Assuming that shearing takes place under minimum energy condition,

Chip velocity is

A
$$10m/min$$
B
$$20m/min$$
C
$$30m/min$$
D
$$40m/min$$
2
GATE PI 1995
+5
-1.5
In a single pass turning operation the cutting speed is the only variable Based on the cutting time cost and the cutting edge cost. The tool life for minimum cost given that cost of $$1$$ cutting edge is Rs.$$5$$, operator wages including the machine tool cost is Rs. $$75$$/hour and tool life equation is $$V{T^{0.1}}$$ is $$100.$$
A
$$10$$
B
$$17$$
C
$$29$$
D
$$36$$
3
GATE PI 1995
True or False
+1
-0
Reamers have usually even number of teeth so that the cutting forces on teeth are properly balanced.
A
TRUE
B
FALSE
4
GATE PI 1995
+1
-0.3
A grinding wheel is said to be glazed if
A
grains have become blunt, but do not fall out
B
gap between the grains is filled by swarf
C
it becomes black due to burning
D
part of the wheel is chipped off
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