Chip breakers are used to
Increase tool life
Remove chips from bed
Break the chips into short segments
To minimise heat generation
Correct Answer :
C. Break the chips into short segments
Related Questions
The different spindle speeds on a lathe form
Arithmetical progression
Geometrical progression
Harmonical progression
Any one of these
The in-feed grinding is used to
Produce tapers
Grind shoulders and formed surfaces
Grind long, slender shafts or bars
All of these
The material property which depends only on the basic crystal structure is
Fatigue strength
Work hardening
Fracture strength
Elastic constant
Which of the following arc welding processes does not use consumable electrodes?
GMAW
GTAW
Submerged Arc Welding
None of these
When the end of a tap is tapered for about three or four threads, it is known as a
Taper tap
Bottoming tap
Second tap
None of these
Which of the following statement is incorrect with reference of lathe cutting tools?
The flank of the tool is the surface or surfaces below and adjacent to the cutting edges
The nose is the corner, arc or chamfer joining the side cutting and the end cutting edges
The heel is that part of the tool which is shaped to produce the cutting edges and face
The base is that surface of the shank which bears against the support and takes tangent pressure of the cut
The angle between the shear plane and __________ is called shear angle.
Work surface
Tool face
Machine surface
None of these
The effective number of lattice points in the unit cell of simple cubic, body centred cubic, and face centred cubic space lattices, respectively, are
1, 2, 2
1, 2, 4
2, 3, 4
2, 4, 4
In a centre lathe, the cutting tool is fed in _________ with reference to the lathe axis.
Cross direction only
Longitudinal direction only
Both cross and longitudinal direction
Any direction
High speed steel drills can be operated at about _________ the speed of high carbon steel drills.
One-half
One-fourth
Double
Four times
The relief or clearance at the cutting edge of a flat drill varies from
3° to 8°
20° to 30°
60° to 90°
90° to 120°
The chamfering is an operation of
Bevelling the extreme end of a workpiece
Embossing a diamond shaped pattern on the surface of a workpiece
Reducing the diameter of a workpiece over a very narrow surface
Enlarging the end of a hole cylindrically
A single point tool has
Rake angle
Cutting angle
Lip angle
All of these
What is the type of welding defect caused due to poor deposition of weld rod is called?
Porosity
Undercut
Under fill
Crack
The guideways are of
Flat type
V-type
Dovetail type
Any one of these
The tailstock set over required to turn a taper on the entire length of a workpiece having diameters D and d is
(D - d)/2L
(D - d)/L
(D - d)/2
D - d
In DC arc welding, if leads are arranged in work as Negative pole of the welding arc and electrode as Positive pole of the welding arc, the arrangement is known as
Fusion
Reverse polarity
Forward welding
Direct polarity
An important geometrical quantity in the cutting of metals which can be used as a criterion for machinability of metals is
Cutting speed
Feed rate
Shear angle
Tool geometry
If a particular Fe-C alloy contains less than 0.83% carbon, it is called
High speed steel
Hypo eutectoid steel
Hyper eutectoid steel
Cast iron
In a planer
Tool is stationary and work reciprocates
Work is stationary and tool reciprocates
Tool moves over stationary work
Tool moves over reciprocating work
Side relief angle of a single point tool is the angle
By which the face of the tool is inclined towards back
By which the face of the tool is inclined sideways
Between the surface of the flank immediately below the point and a plane at right angles to the centre line of the point of tool
Between the surface of the flank immediately below the point and a line drawn from the point perpendicular to the base
Crater wear is mainly due to the phenomenon known as
Adhesion of metals
Oxidation of metals
Diffusion of metals
All of these
Which of the following statement is correct as regard to up milling?
It cannot be used on old machines due to backlash between the feed screw of the table and the nut.
The chips are disposed off easily and do not interfere with the cutting.
The surface milled appears to be slightly wavy.
The coolant can be poured directly at the cutting zone where the cutting force is maximum.
In up-cut milling the work piece is fed
Against the rotating cutter
At angle of 60° to the cutter
In the direction of the cutter
At the right angle to the cutter
In _________ operation, the cutting force is maximum when the tooth begins its cut and reduces it to minimum when the tooth leaves the work.
Up milling
Down milling
Face milling
End milling
Threading is an operation of
Smoothing and squaring the surface around a hole
Sizing and finishing a small diameter hole
Producing a hole by removing metal along the circumference of a hollow cutting tool
Cutting helical grooves on the external cylindrical surface
A lathe with four steps on the cone pulley and with back-gears will have
Four direct speeds
Four indirect speeds
Four direct and four indirect speeds
Eight indirect speeds
A diamond locating pin is used in jigs and fixtures because
Diamond is very hard and wear resistant
It occupies very little space
It helps in assembly with tolerance on centre distance
It has a long life
A CNC vertical milling machine has to cut a straight slot of 10 mm width and 2mm depth by a cutter of 10 mm diameter between points (0,0) and (100,100) on the XY plane (dimensions in mm). The feed rate used for milling is 50 mm/min, milling time for the slot (in seconds) is
120
170
180
240
Cold working of steel is defined as working
At its recrystallisation temperature
Above its recrystallisation temperature
Below its recrystallisation temperature
At two thirds of the melting temperature of the metal