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GATE Mechanical 1988 Question

Pure metal pose machinability problem in turning operations. The reason is the
A
Increased length of contact due to the production of continuous chip
B
Susceptibility to chemical reactions
C
Tendency to form intense adhesion joint with the tool face
D
Absence of inclusions which aids chip formation

GATE Mechanical 1989 Question

In turning operation the feed rate could be doubled to increase the metal removal rate To keep the same level of surface finish, the nose radius of the tool has to be
A
Doubled
B
Halved
C
Multiplied by $4$ time
D
Kept unchanged.

GATE Mechanical 1997 Question

In a typical metal cutting operation, using a cutting tool of positive rake $\gamma = 10\deg ,$ it was observed that the shear angle was $20deg$. The friction angle is
A
$45$
B
$30$
C
$60$
D
$40$

GATE Mechanical 1997 Question

A cutting tool has a nose radius of $1.8mm$. The feed rate for a theoretical surface roughness of ${R_t} = 5$ microns is
$0.268$ $mm/rev$
$0.187$ $mm/rev$
$0.036$ $mm/rev$
$0.0187$ $mm/rev$