Projection welding is a
Continuous spot welding process
Multi-spot welding process
Arc welding process
Process used for joining round bars
Correct Answer :
B. Multi-spot welding process
Related Questions
A casting defect which occurs due to improper venting of sand is known as
Cold shuts
Blow holes
Shift
Swell
In a compound die
Only one operation is performed at each stroke of the ram
Two or more operations are performed simultaneously at the single stroke of the ram
Two or more cutting operations are performed at one station of the press in every stroke of the ram
Both cutting and non-cutting operations are performed at one station of the press in every stroke of the ram
If an aluminium pattern made from a wooden master pattern is to be used for grey iron castings, then the shrinkage allowance allowed on the wooden pattern should be
10 mm/m
16 mm/m
20 mm/m
26 mm/m
The directional solidification in casting can be improved by using
Chills and chaplets
Chills and padding
Chaplets and padding
Chills, chaplets and padding
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
The most preferred process for casting gas turbine blades is
Die casting
Shell moulding
Investment moulding
Sand casting
The welding process used in joining mild steel shanks to high speed drills, is
Spot welding
Seam welding
Flash butt welding
Upset butt welding
In a hot chamber die casting machine
Melting pot is separate from the machine
Melting pot is an integral part of the machine
Melting pot may have any location
High temperature and pressure is used
The purpose of a gate is to
Delivers molten metal into the mould cavity
Act as a reservoir for the molten metal
Feed the molten metal to the casting in order to compensate for the shrinkage
Delivers molten metal from pouring basin to gate
4.Linde welding uses
Neutral flame and rightward technique
Oxidising flame and leftward technique
Neutral flame and leftward technique
Carburising flame and rightward technique
The electron beam welding can be carried out in
Open air
A shielded gas environment
Vacuum
A pressurised inert gas chamber
Cold working of metal increases
Tensile strength
Yield strength
Hardness
All of these
The maximum flame temperature occurs
At the outer cone
At the inner cone
Between the outer and inner cone
At the torch tip
Sand wash is a casting defect which
Results in a mismatching of the top and bottom parts of a casting
Results in general enlargement of the casting
Occurs near the ingates as rough lumps on the surface of a casting
Occurs as sand patches on the upper surface of a casting
In ________ welding, the weld may be made either from left to right or from right to left.
Forehand
Backhand
Vertical
None of these
The machining allowance provided on patterns depends upon
Type of casting metal
Size and shape of casting
Method of casting used
All of these
The welding process used to join the ends of two pipes of uniform cross-section, is
Spot welding
Seam welding
Projection welding
Upset butt welding
The mode of deformation of the metal during spinning is
Bending
Stretching
Rolling and stretching
Bending and stretching
The casting method adopted for ornaments and toys of nonferrous alloys, is
Permanent mould casting
Slush casting
Die casting
Centrifugal casting
The sand used for making cores is
Green sand
Dry sand
Loam sand
Oil sand
The chisel used for cutting key ways is
Flat chisel
Cape chisel
Round nose chisel
Diamond pointed chisel
Which of the following methods can be used for manufacturing 2 metre long seamless metallic tubes?
Drawing
Extrusion
Rolling
Extrusion and rolling
The width of slot cut by a hacksaw blade is _______ the width of the blade.
Equal to
Less than
Greater than
None of these
In spot welding, the distance between the nearest edge of the plate and centre of weld should be equal to
d
1.5d
3d
6d
A diamond pointed chisel is used for cutting
Flat surfaces
Grooves
Keyways
V-shaped grooves
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
For welding plates of thickness more than 12.5 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 fullers are used
For finishing flat surfaces
For necking down a piece of work
For punching a hole
To finish the punched hole
The operation of bending a sheet of metal along a curved axis, is known as
Plunging
Notching
Slitting
Forming
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