Structural sections such as rails, angles, I-beams are made by
Hot rolling
Hot drawing
Hot piercing
Hot extrusion
Correct Answer :
A. Hot rolling
Related Questions
In a cold chamber die casting machine, only nonferrous alloys with _________ are casted.
Low melting temperature
High melting temperature
Both (A) and (B)
None of these
Which of the following welding process uses non-consumable electrodes?
TIG welding
MIG welding
Manual arc welding
Submerged arc welding
The chisel used for cutting key ways is
Flat chisel
Cape chisel
Round nose chisel
Diamond pointed chisel
The operation of bending a sheet of metal along a curved axis, is known as
Plunging
Notching
Slitting
Forming
Extrusion
Is extensively used for making bolts and nuts
Is used for reducing the diameter of round bars and tubes by rotating dies which open and close rapidly on the work
Is used to improve fatigue resistance of the metal by setting up compressive stresses in its surface
Consists of pressing the metal inside a chamber to force it out by high pressure through an orifice which is shaped to provide the desired form of the finished part
Structural sections such as rails, angles, I-beams are made by
Hot rolling
Hot drawing
Hot piercing
Hot extrusion
The oxygen cylinder is usually painted with
Black colour
White colour
Maroon colour
Yellow colour
The machining allowance provided on patterns depends upon
Type of casting metal
Size and shape of casting
Method of casting used
All of these
In die casting, machining allowance is
Small
Large
Very large
Not provided
Aluminium is the best material for making patterns because it is
Light in weight
Easy to work
Corrosion resistant
All of these
In arc welding, the temperature of heat produced by the electric arc is of the order of
3000°C to 4000°C
4000°C to 5000°C
5000°C to 6000°C
6000°C to 7000°C
The temperature of the inner luminous cone of neutral flame is about
1000°C
1250°C
2100°C
3200°C
The process used to improve fatigue resistance of the metal by setting up compressive stresses in its surface, is known as
Hot piercing
Extrusion
Cold peening
Cold heading
In arc welding, the electric arc is produced between the work and the electrode by
Voltage
Flow of current
Contact resistance
All of these
Tandem drawing of wires and tubes is necessary because
It is not possible to reduce at one stage
Annealing is needed between stages
Accuracy in dimensions is not possible otherwise
Surface finish improves after every drawing stage
The punch and die set up is ________ for punching and piercing operation.
Same
Similar
Different
None of these
In a hot chamber die casting machine
Ferrous alloys with low melting temperature are casted
Ferrous alloys with high melting temperature are casted
Nonferrous alloys with low melting temperature are casted
Nonferrous alloys with high melting temperature are casted
During drawing operation, the states of stress in cup would include
Compressive stress in the flange
Tensile stress in the wall
Both (A) and (B)
None of these
A basic hole is one whose
Lower deviation is zero
Upper deviation is zero
Lower and upper deviations are zero
None of these
The property of sand due to which it evolves a great amount of steam and other gases is called
Collapsibility
Permeability
Cohesiveness
Adhesiveness
For obtaining a cup of diameter 25 mm and height 15 mm by drawing, the size of the round blank should be approximately
42 mm
44 mm
46 mm
48 mm
In ________ welding, the weld may be made either from left to right or from right to left.
Forehand
Backhand
Vertical
None of these
For gas welding, the pressure desired at the welding torch for oxygen is
7 to 103 kN/m²
70 to 280 kN/m²
280 to 560 kN/m²
560 to 840 kN/m²
During hot working of metals
Porosity of the metal is largely eliminated
Grain structure of the metal is refined
Mechanical properties are improved due to refinement of grains
All of the above
In TIG arc welding, the welding zone is shielded by an atmosphere of
Helium gas
Argon gas
Either (A) or (B)
None of these
A progressive limit gauge has
'Go' and 'Not go' member on the same side of the gauge
Separate 'Go' and 'Not go' members
'Go' member at one end and 'Not go' member at the other end
None of the above
In spot welding, the spacing between two spot weld should not be less than
d
1.5 d
3 d
6 d
For welding plates of thickness less than 5 mm, its edges
Do not require bevelling
Should be bevelled to a single-V or U-groove
Should have a double-V or U-groove on one side
Should have a double-V or U-groove on both sides
The width of slot cut by a hacksaw blade is _______ the width of the blade.
Equal to
Less than
Greater than
None of these
Cast iron and steel pipes are produced by
Slush casting
Investment casting
True centrifugal casting
Die casting