1
GATE PI 2004
MCQ (Single Correct Answer)
+2
-0.6
In which of the choices given below, the cutting tool materials are placed in the ascending order of permissible cutting speed for machining of steel?
A
$$K$$ Group Cemented Carbide-$$P$$ Group Cemented Carbide-Ceramic -Cubic Boron Nitride
B
Cubic Boron Nitride - $$K$$ Group Cemented Carbide - $$P$$ Group Cemented Carbide - Ceramic
C
$$P$$ Group Cemented Carbide - $$K$$ Group Cemented Carbide - Cubic Boron Nitride - Ceramic
D
Ceramic - Cubic Boron Nitride - $$K$$ Group Cemented Carbide - $$P$$ Group Cemented Carbide
2
GATE PI 2004
MCQ (Single Correct Answer)
+2
-0.6
Consider the following statements with respect to the relief angle of cutting tool:

$$1.$$ This affects the direction of chip flow.
$$2.$$ This reduces excessive friction between the tool and work piece
$$3.$$ This affects tool life
$$4.$$ This allows better access of coolant to the tool-work piece interface

Which of the statements given above are correct?

A
$$1$$ and $$2$$
B
$$2$$ and $$3$$
C
$$2$$ and $$4$$
D
$$3$$ and $$4$$
3
GATE PI 2004
MCQ (Single Correct Answer)
+2
-0.6
Two identical cylindrical jobs are turned using (a) a round nosed tool of nose radius $$2$$ $$mm$$ and (b) a sharp corner tool having principal cutting edge angle $$ = {45^ \circ }$$ and auxiliary cutting edge angle $$ = {10^ \circ }$$. If the operation is carried out at a feed of $$0.08$$ $$mm/rev,$$ the heights of micro irregularities on the machined surfaces (in $$mm$$) in the two cases will be
A
$$0.0001, 0.024$$
B
$$0.0002, 0.012$$
C
$$0.0003, 0.024$$
D
$$0.0004, 0.012$$
4
GATE PI 2003
MCQ (Single Correct Answer)
+2
-0.6
Tool life equation for two tools under consideration are as follows

$$\eqalign{ & HSS:\,\,\,\,\,\,\,\,\,\,\,\,\,V{T^{0.2}} = 150 \cr & Carbide:\,\,\,\,\,\,V{T^{0.3}} = 250 \cr} $$
Where $$V$$ is the cutting speed in $$m/min$$ and $$T$$ is the tool life in $$min.$$ The breakdown cutting speed above which the carbide tool will be beneficial is

A
$$54$$ $$m/min$$
B
$$150$$ $$m/min$$
C
$$194$$ $$m/min$$
D
$$250$$ $$m/min$$
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