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Carburising flame is used to weld
hard surfacing materials such as stellite
All of These
steel, cast iron, copper, aluminium etc
brass and bronze
In arc welding, the electric arc is produced between the work and the electrode by
flow of current
contact resistance
Voltage
All of These
In spot welding, the distance between the nearest edge of the plate and centre of weld should be equal to
6 d
1.5 d
3 d
D
The directional solidification in casting can be improved by using
chills and chaplets
chills, chaplets and padding
chaplets and padding
chills and padding
In a unilateral system of tolerance, the tolerance is allowed on
both sides of the nominal size
one side of the actual size
both sides of the actual size
one side of the nominal size
Which of the following welding process uses non-consumable electrodes
MIG welding
TIG welding
Submerged arc welding
Manual arc welding
Structural sections such as rails, angles, I-beams are made by
hot piercing
hot extrusion
Hot rolling
hot drawing
For welding plates of thickness less than 5 mm, its edges
should be bevelled to a single-V or U-groove
should have a double-V or U-groove on both sides
should have a double-V or U-groove on one side
do not require bevelling
Aluminium is the best material for making patterns because it is
All of These
light in weight
easy to work
corrosion resistant
Cutting and forming operations can be performed in a single operation in a
progressive die
compound die
simple die
combination die
In order to get uniform thickness of the plate by rolling process, one provides
hardening of the rolls
camber on the rolls
antifriction bearings
offset on the rolls
V-block is used to
check the trueness of flat surfaces
NONE OF THESE
locate centres of round rods
check the surface roughness
Shift is a casting defect which
occurs near the ingates as rough lumps on the surface of a casting
results in general enlargement of a casting
occurs as sand patches on the upper surface of a casting
results in a mismatching of the top and bottom parts of a casting
The consumable electrode is used in
MIG arc welding
Submerged arc welding
Carbon arc welding
TIG arc welding
In shielded arc welding
large electrode is used
welding rod coated with slag is used
None of the above
welding rod coated with fluxing material is used
The advantage of thermit welding is that
results in a minimum problem with internal residual stresses
all parts of the weld section are molten at the same time
All of the above
weld cools almost uniformly
Which of the following methods can be used for manufacturing 2 metre long seamless metallic tubes
Extrusion and rolling
extrusion
rolling
Drawing
In welding copper alloys with TIG arc welding
direct current with reversed polarity is used
direct current with straight polarity is used
any one of these
alternating current is used
The temperature produced by oxy-hydrogen flame is about
2400° C
3200° C
2100° C
1800° C
The accuracy of micrometers, calipers, dial indicators can be checked by a
feeler gauge
Slip gauge
plug gauge
ring gauge
1
2
5
10
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