A left hand tool on a lathe cuts most efficiently when it travels
From left to right end of the lathe bed
From right to left end of the lathe bed
With the help of a compound slide
Across the bed
Correct Answer :
A. From left to right end of the lathe bed
Related Questions
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
The grade of grinding wheel depends upon
Hardness of the material being ground
Speed of wheel and work
Condition of grinding machine
All of these
Buffing wheels are made of
Softer metals
Cotton fabric
Carbon
Graphite
In a single point turning operation with a cemented carbide and steel combination having a Taylor exponent of 0.25, if the cutting speed is halved, then tool life will become
Half
Two times
Eight times
Sixteen times
In ultrasonic machining, tool is made of
Tungsten carbide
Brass or copper
Diamond
Stainless steel
The negative rake is usually provided on
High carbon steel tools
High speed steel tools
Cemented carbide tools
All of these
When two main plates are kept in alignment butting each other and riveted with cover plate on both sides of the main plates with two rows of rivets in each main plate, the joint is known as _______ double cover butt joint.
Single riveted
Double riveted
Both (A) and (B)
None of these
The lip clearance angle is the angle formed by the
Leading edge of the land with a plane having the axis of the drill
Flank and a plane at right angles to the drill axis
Chisel edge and the lip as viewed from the end of a drill
None of the above
Stellite preserves hardness upto a temperature of
350°C
500°C
900°C
1100°C
If the flame of the welding torch is directed towards the progress of welding, then what will you call the welding technique?
Forehand welding
Flux cored ARC welding
Electro slag welding
Pulsed spray welding
The silicon carbide abrasive is chiefly used for grinding
Cemented carbide
Ceramic
Cast iron
All 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
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
Two 1 mm thick steel sheets are to be spot welded at a current of 5000 A. Assuming effective resistance to be 200 μm and current flow time of 0.2 second, heat generated during the process will be
0.2 Joule
1 Joule
5 Joule
1000 Joule
In a shaper, the length of stroke is increased by
Increasing the centre distance of bull gear and crank pin
Decreasing the centre distance of bull gear and crank pin
Increasing the length of the arm
Decreasing the length of the slot in the slotted lever
Crater wear is mainly due to the phenomenon known as
Adhesion of metals
Oxidation of metals
Diffusion of metals
All of these
During normalizing process of steel, the specimen is heated
Between the upper and lower critical temperature and cooled in still air.
Above the upper critical temperature and cooled in furnace.
Above the upper critical temperature and cooled in still air.
Between the upper and lower critical temperature and cooled in furnace.
The soft grade grinding wheels are denoted by the letters
A to H
I to P
Q to Z
A to P
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
Green sand mould indicates that
Polymeric mould has been cured
Mould has been totally dried
Mould is green in colour
Mould contains moisture
The relation between the tool life (T) in minutes and cutting speed (V) in m/min is (where n = An exponent, which depends upon the tool and workpiece, and C = A constant)
VnT = C
VTn = C
Vn/T = C
V/Tn = C
As the cutting speed increases, the tool cutting forces
Remain constant
Increases
Decreases
First increases and then decreases
The angle between the lathe centres is
30°
45°
60°
90°
Ceramic tools are fixed to tool body by
Soldering
Brazing
Welding
Clamping
In electro-discharge machining, dielectric is used to
Help in the movement of the sparks
Control the spark discharges
Act as coolant
All of these
In determining the various forces on the chip, Merchant assumed that the
Cutting edge of the tool is sharp and it does not make any flank contact with the workpiece
Only continuous chip without built-up-edge is produced
Cutting velocity remains constant
All of the above
The depth of cut in drilling is __________ the drill diameter.
Equal to
One-fourth
One-half
Double
The high cutting speed and large rake angle of the tool will result in the formation of
Continuous chips
Discontinuous chip
Continuous chips with built up edge
None of these
The aluminium oxide abrasive is chiefly used for grinding
High speed steel
Carbon steel
Wrought iron
All of these
Which of the following parameters influence the axial feed rate in centerless grinding?
Regulating wheel diameter
Speed of the regulating wheel
Angle between the axes of grinding and regulating wheels
All of the above