The electron beam welding can be carried out in
Open air
A shielded gas environment
Vacuum
A pressurised inert gas chamber
Correct Answer :
C. Vacuum
Related Questions
The metal patterns as compared to wooden patterns require less
Shrinkage allowance
Machining allowance
Draft allowance
Distortion allowance
In permanent mould casting method
Molten metal is poured in a metallic mould, retained in the mould long enough for the outer skin to solidify and finally mould is turned over to remove molten metal still in molten condition
Molten metal is poured and allowed to solidify while the mould is revolving
Molten metal is forced into mould under high pressure
None of the above
The centrifugal casting method, is used for casting articles of
Symmetrical shape about vertical axis
Symmetrical shape about horizontal axis
Irregular shape
Nonferrous metal only
The edge of a steel plate cut by oxygen cutting will get hardened when the carbon content is
Less than 0.1 percent
Less than 0.3 percent
More than 0.3 percent
Anywhere between 0.1 to 1 percent
The mode of deformation of the metal during spinning is
Bending
Stretching
Rolling and stretching
Bending and stretching
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 piercing operation, the clearance is provided on
Punch
Die
Half on the punch and half on the die
Either on punch or die depending upon designer's choice
A mortise gauge is a
Striking tool
Planing tool
Boring tool
Marking tool
Which of the following methods can be used for manufacturing 2 metre long seamless metallic tubes?
Drawing
Extrusion
Rolling
Extrusion and rolling
The operation of cutting a sheet of metal in a straight line along the length, is known as
Plunging
Notching
Slitting
Forming
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
Lancing is the operation of
Cutting a sheet of metal in a straight line along the length
Removal of metal to the desired shape from the edge of a plate
Cutting a sheet of metal through part of its length and then bending the cut portion
Bending a sheet of metal along a curved axis
The teeth of hacksaw blade are bent
Towards right
Towards left
Alternately towards right and left and every third or fourth left straight
May be bent in any direction
In a simple die
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
None of the above
The parts of circular cross-section which are symmetrical about the axis of rotation are made by
Hot forging
Hot spinning
Hot extrusion
Hot drawing
Which one of the following material will require the largest size of riser for the same size of casting?
Aluminium
Cast iron
Steel
Copper
Cores are used to
Form internal cavities in the casting
Improve mould surface
Form a part of a green sand mould
All of these
A diamond pointed chisel is used for cutting
Flat surfaces
Grooves
Keyways
V-shaped grooves
The material which can be best cut with oxygen cutting process is
Mild steel
Brass
Copper
Aluminium
A neutral flame is obtained by supplying
Equal volumes of oxygen and acetylene
More volume of oxygen and less volume of acetylene
More volume of acetylene and less volume of oxygen
None of the above
An oxidising process used for aluminium and magnesium articles is called
Galvanising
Anodising
Parkerising
Sherardizing
Green sand is a mixture of
30% sand and 70% clay
50% sand and 50% clay
70% sand and 30% clay
90% sand and 10% clay
The oxygen cylinder is usually painted with
Black colour
White colour
Maroon colour
Yellow colour
Neutral flame is used to weld
Steel
Cast iron
Copper
All of these
Seam welding is a
Continuous spot welding process
Multi-spot welding process
Arc welding process
Process used for joining round bars
In die casting, machining allowance is
Small
Large
Very large
Not provided
The increase in hardness due to cold working, is called
Age hardening
Work hardening
Induction hardening
Flame hardening
In order to check the clearance between two mating surfaces, a ________ gauge should be used.
Ring
Plug
Feeler
None of these
The temperature of the inner luminous cone of neutral flame is about
1000°C
1250°C
2100°C
3200°C
The recrystallisation temperature of steel is
400°C
600°C
800°C
None of these