1
GATE PI 2004
MCQ (Single Correct Answer)
+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 $$4$$
2
GATE PI 2004
MCQ (Single Correct Answer)
+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
$$10.5$$
3
GATE PI 2004
MCQ (Single Correct Answer)
+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 GATE PI 2004 Machine Tools and Machining - Machining Question 22 English
A
positive side rake angle
B
positive back rake angle
C
positive cutting edge inclination angle
D
negative cutting edge inclination angle
4
GATE PI 2004
MCQ (Single Correct Answer)
+1
-0.3
The cutting portion of a drill is to be welded to its shank. The process best suited for this is
A
ultrasonic welding
B
electron beam welding
C
friction welding
D
laser welding
EXAM MAP