1
GATE PI 2004
+2
-0.6
A non standard thread of pitch $$3.175$$ $$mm$$ is to be cut on a lathe having lead screw of pitch $$6$$ $$mm.$$ A change gear set provided with the lathe has one gear each with the following number of teeth: $$20, 30, 40, 50, 60, 70, 80,$$ $$90, 100, 110, 120, 127.$$ The correct pairs of change gears $$\left( {a/b\,\,x\,\,c/d} \right)$$ for machining the given thread are (assuming that the transmission ratio of the rest of the kinematic train between the lathe spindle and lead screw is equal to
A
$${{127} \over {30}} \times {{20} \over {80}}$$
B
$${{127} \over {40}} \times {{20} \over {120}}$$
C
$${{127} \over {20}} \times {{30} \over {120}}$$
D
$${{127} \over {50}} \times {{30} \over {80}}$$
2
GATE PI 2004
+2
-0.6
A job of the shape shown in the figure below is to be machined on a lathe. The tool best suited for machining of this job must have A
positive side rake angle
B
positive back rake angle
C
positive cutting edge inclination angle
D
negative cutting edge inclination angle
3
GATE PI 2004
+2
-0.6
A $$\phi$$ $$20$$ $$mm$$ through hole is to be drilled in a $$30$$ $$mm$$ thick plate using a double fluted, $${120^ \circ }$$ lip angle drill. The drill tip is at a distance of $$3$$ $$mm$$ from the plate surface when cutting is started and an over travel of $$2$$ $$mm$$ is recommended as a margin to ensure drilling through the full thickness of the plate. If the drill rotates at $$500$$ $$rev/min$$ and the feed per tooth is $$0.01$$ $$mm,$$ the machining time of the operation (in sec) will be
A
$$4.5$$
B
$$7.5$$
C
$$9$$
D
$$10.5$$
4
GATE PI 2004
+2
-0.6
Consider the following statements:

The helical flute in a twist drill provides the necessary
$$1.$$ Clearance angle for the cutting edge.
$$2.$$ Rake angle for the cutting edge.
$$3.$$ Space for the chip to come out during drilling.
$$4.$$ Guidance for the drill to enter into the work piece.

Which of the statements given above are correct?

A
$$1$$ and $$2$$
B
$$2$$ and $$3$$
C
$$3$$ and $$4$$
D
$$1$$ and $$4$$
GATE PI Subjects
Fluid Mechanics
Metrology
Theory of Machines
Engineering Mathematics
Heat Transfer
Machine Tools and Machining
Industrial Engineering
Engineering Mechanics
Strength of Materials
Thermodynamics
Machine Design
Casting
Joining of Materials
Metal Forming
EXAM MAP
Joint Entrance Examination