Hardness of steel greatly improves with
Annealing
Cyaniding
Normalizing
Tempering
Correct Answer :
B. Cyaniding
Related Questions
Hot rolling of mild steel is carried out
At recrystallization temperature
Between 100⁰C to 150⁰C
Between recrystallization temperature
Above recrystallization temperature
A feed gear box for a screw cutting lathe is designed on the basis of
Geometric progression
Arithmetic progression
Harmonic progression
None of these
A drill considered as a cutting tool having zero rake, is known as a
Flat drill
Straight fluted drill
Parallel shank twist drill
Tapered shank twist drill
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
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
The advantage of a broaching operation is that
Rate of production is very high
High accuracy and high class of surface finish is possible
Roughing and finishing cuts are completed in one pass of the tool
All of the above
The broaching operation in which either the work or the tool moves across the other, is known as
Pull broaching
Push broaching
Surface broaching
Continuous broaching
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
Which of the following statement is correct regarding grinding of high carbon steel?
Grinding at high speed results in the reduction of chip thickness and cutting forces per grit.
Aluminium oxide wheels are employed.
The grinding wheel has to be of open structure.
All of the above
Shrinkage allowance on pattern is provided to compensate for shrinkage when
The temperature of liquid metal drops from pouring to freezing temperature
The metal changes from liquid to solid state at freezing temperature
The temperature of solid phase drops from freezing to room temperature
The temperature of metal drops from pouring to room temperature
For machining a cast iron workpiece by a high speed steel tool, the average cutting speed is
10 m/min
15 m/min
22 m/min
30 m/min
In metal cutting, use of low feeds and high cutting speeds is desired when the objective is
High metal removal rate
Dry machining
Use of soft cutting tool
Surface finish
The guideways are of
Flat type
V-type
Dovetail type
Any one of these
In which of the following machine, the work remains stationary and the tool is rotated?
Vertical boring machine
Horizontal boring machine
Precision boring machine
Jig boring machine
In electrochemical machining, the gap between the tool and work is kept as
0.1 mm
0.4 mm
0.35
0.75 mm
A twist drill is a
Side cutting tool
Front cutting tool
End cutting tool
None of these
The parameter which completely defines the chip formation in a metal cutting process is
Shear angle
Chip-tool contact length
Both (A) and (B)
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
Ceramic tools are fixed to tool body by
Soldering
Brazing
Welding
Clamping
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
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 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
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
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.
Gears can be best produced on mass production by
Shaping
Casting
Forming
Hobbing
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 single point thread cutting tool should ideally hav
Zero rake angle
Positive rake angle
Negative rake angle
Point angle
What is the type of shielding gas for GTAW (Gas Tungsten Arc Welding) used for carbon steels only called?
Argon H₂
Argon CO₂
Argon Helium
Helium
The swing diameter over the bed is ________ the height of the centre measured from the bed of the lathe.
Equal to
Twice
Thrice
One-half
The rake angle required to machine brass by high speed steel tool is
0°
10°
20°
100°