The brass and bronze are welded by _________ flame.
Neutral
Oxidising
Carburising
All of these
Correct Answer :
B. Oxidising
Related Questions
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
Cutting and forming operations can be performed in a single operation in a
Simple die
Progressive die
Compound die
Combination die
Which of the following statement is wrong?
The hot chamber die casting machine is used for casting zinc, tin, lead and other low melting alloys.
The cold chamber die casting machine is used for casting aluminium, magnesium, copper base alloys and other high melting alloys.
The castings produced by centrifugal casting method have open and coarse grained structure.
All of the above
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
The cutting edge of a chisel should be
Hardened
Tempered
Hardened and tempered
Case hardened
The metal extrusion process is generally used for producing
Uniform solid sections
Uniform hollow sections
Uniform solid and hollow sections
Varying solid and hollow sections
Which of the following welding method uses a pool of molten metal?
Carbon arc welding
Submerged arc welding
TIG arc welding
MIG arc welding
The tolerance produced by shell moulding process of casting is
+0.05 mm
±0.2 mm
+0.5 mm
±1 mm
In a four high rolling mill, there are four rolls out of which
One is working roll and three are backing up rolls
Two are working rolls and two are backing up rolls
Three are working rolls and one is backing up roll
All of the four are working rolls
In order to cut mild steel, the cutting angle of chisel should be
30°
45°
50°
60°
Acetylene gas is stored in cylinders in
Solid form
Gaseous form
Liquid form
Any one of these
For arc welding
Alternating current with high frequency is used
Alternating current with low frequency is used
Direct current is used
Any one of these
Which of the following material can be used for making patterns?
Aluminium
Wax
Lead
All of these
Which of the following statement is wrong?
The mortise gauge has two scribing pins
The gouges are chisels with a hollow shaped blade
An auger is a planing tool
All of these
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
4.Linde welding uses
Neutral flame and rightward technique
Oxidising flame and leftward technique
Neutral flame and leftward technique
Carburising flame and rightward technique
A casting defect which occurs near the ingates as rough lumps on the surface of a casting is known as
Shift
Sand wash
Swell
Scab
The increase in hardness due to cold working, is called
Age hardening
Work hardening
Induction hardening
Flame hardening
A moving mandrel is used in
Wire drawing
Tube drawing
Metal cutting
Forging
The difference between the upper limit and lower limit of a dimension is called
Nominal size
Basic size
Actual size
Tolerance
The welding process used in joining mild steel shanks to high speed drills, is
Spot welding
Seam welding
Flash butt welding
Upset butt welding
The property of sand due to which the sand grains stick together is called
Collapsibility
Permeability
Cohesiveness
Adhesiveness
The casting method adopted for ornaments and toys of nonferrous alloys, is
Permanent mould casting
Slush casting
Die casting
Centrifugal casting
In spot welding, the spacing between two spot weld should not be less than
d
1.5 d
3 d
6 d
The welding set up is said to have straight polarity, when
Work is connected to the positive terminal and the electrode holder to the negative terminal
Work is connected to the negative terminal and the electrode holder to the positive terminal
Work is connected to the positive terminal and the electrode holder is earthed
Work is connected to the negative terminal and the electrode holder is earthed
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
Which of the following welding process uses non-consumable electrodes?
TIG welding
MIG welding
Manual arc welding
Submerged arc welding
In shielded arc welding
Large electrode is used
Welding rod coated with slag is used
Welding rod coated with fluxing material is used
None of the above
The cross-section of a chisel is usually
Rectangular
Square
Hexagonal
Octagonal
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