Slow speed of the spindle is necessary in
Thread cutting
Turning a work of larger diameter
Turning a hard or tough material
All of these
Correct Answer :
D. All of these
Related Questions
Ceramic cutting tools are
Made by cold pressing of aluminium oxide powder
Available in the form of tips
Brittle and have low bending strength
All of these
Quality screw threads are produced by
Thread milling
Thread chasing
Thread cutting with single point tool
Thread casting
Allowance in limits and fits refers to
Maximum clearance between shaft and hole
Minimum clearance between shaft and hole
Difference between maximum and minimum sizes of hole
Difference between maximum and minimum sizes of shaft
Larger than 15° side cutting edge angle
Increases tool life
Decreases tool life
Produces chipping and decreases tool life
Results in excessive stress concentration and greater heat generation
As the cutting speed increases, the tool cutting forces
Remain constant
Increases
Decreases
First increases and then decreases
The taper on the lathe spindle is
1 in 10
1 in 15
1 in 20
1 in 30
Continuous chips with built up edge are formed during machining of
Brittle metals
Ductile metals
Hard metals
Soft metals
High speed steel cutting tools operate at cutting speeds _________ than carbon steel tools.
2 to 3 times lower
2 to 3 times higher
5 to 8 times higher
8 to 20 times higher
The tool life in case of a grinding wheel is the time
Between two successive regrinds of the wheel
Taken for the wheel to be balanced
Taken between two successive wheel dressings
Taken for a wear of 1 mm on its diameter
Flank wear occurs mainly on the
Nose part, front relief face and side relief face of the cutting tool
Face of the cutting tool at a short distance from the cutting edge
Cutting edge only
Front face only
Stellite preserves hardness upto a temperature of
350°C
500°C
900°C
1100°C
The factor responsible for the formation of discontinuous chips is
Low cutting speed and large rake angle
Low cutting speed and small rake angle
High cutting speed and large rake angle
High cutting speed and small rake angle
Which of the following engineering materials is the most suitable candidate for hot chamber die casting?
Low carbon steel
Titanium
Copper
Tin
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
The hole to be drilled for tapping is _________ the outside diameter of the thread on the tap.
Equal to
Smaller than
Greater than
None of these
Side rake angle of a single point cutting 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 the tool
Between the surface of the flank immediately below the point and a line drawn from the point perpendicular to the base
The process of removing metal by a cutter which is rotated against the direction of travel of workpiece, is called
Up milling
Down milling
Face milling
End milling
What type of fusion welding process is used for welding sheet metals of all engineering metals (except Cu, Ag) in automobile and air craft industries, pipe and tubing production?
Thermit welding
Electroslag welding
Resistance welding
Submerged arc welding
In an orthogonal cutting, the depth of cut is halved and the feed rate is double. If the chip thickness ratio is unaffected with the changed cutting conditions, the actual chip thickness will be
Doubled
Halved
Quadrupled
Unchanged
The cutting tool in a milling machine is mounted on
Spindle
Arbor
Column
Knee
Jigs are used
For holding and guiding the tool in drilling, reaming or tapping operations
For holding the work in milling, grinding, planing or turning operations
To check the accuracy of workpiece
None of the above
In a metal arc welding process, a gas metal arc welding with magnetized flux is used and can be done in all the positions i.e. flat position, vertical position or inclined position.
Globular transfer
Spray transfer
GMAW practice
Dip transfer
It is required to cut screw threads of 2 mm pitch on a lathe. The lead screw has a pitch of 6 mm. If the spindle speed is 60 r.p.m., then the speed of lead screw will be
10 r.p.m.
20 r.p.m.
120 r.p.m.
180 r.p.m.
The carbide tools operating at very low cutting speeds (below 30 m/min)
Reduces tool life
Increases tool life
Have no effect on tool life
Spoils the work piece
In which type of welding a gas shield, a consumable electrode is used and the welding can be done in all positions.
ARC welding
Submerged ARC welding
TIG welding
MIG welding
In the relation VTn = C, the value of n for carbide tools is
0.1 to 0.2
0.20 to 0.25
0.25 to 0.40
0.40 to 0.55
When the shear angle is large
Path of shear is short and chip is thin
Path of shear is large and chip is thick
Path of shear is short and chip is thick
Path of shear is large and chip is thin
The soft grade grinding wheels are denoted by the letters
A to H
I to P
Q to Z
A to P
The trade name of a nonferrous cast alloy composed of cobalt, chromium and tungsten is called
Ceramic
Stellite
Diamond
Cemented carbide
The floating position of the holding fixture in a rotary transfer device is used to
Improve the accuracy of location
Reduce the tendency to over-index
Improve upon the acceleration and deceleration characteristics
Reduce the cycle time