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Carburising flame is used to weld
All of These
steel, cast iron, copper, aluminium etc
hard surfacing materials such as stellite
brass and bronze
In arc welding, the electric arc is produced between the work and the electrode by
flow of current
All of These
contact resistance
Voltage
In spot welding, the distance between the nearest edge of the plate and centre of weld should be equal to
1.5 d
6 d
3 d
D
The directional solidification in casting can be improved by using
chills, chaplets and padding
chills and padding
chills and chaplets
chaplets and padding
In a unilateral system of tolerance, the tolerance is allowed on
both sides of the nominal size
both sides of the actual size
one side of the actual size
one side of the nominal size
Which of the following welding process uses non-consumable electrodes
Submerged arc welding
TIG welding
Manual arc welding
MIG welding
Structural sections such as rails, angles, I-beams are made by
hot piercing
Hot rolling
hot drawing
hot extrusion
For welding plates of thickness less than 5 mm, its edges
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
should be bevelled to a single-V or U-groove
Aluminium is the best material for making patterns because it is
corrosion resistant
light in weight
easy to work
All of These
Cutting and forming operations can be performed in a single operation in a
simple die
compound die
progressive die
combination die
In order to get uniform thickness of the plate by rolling process, one provides
offset on the rolls
antifriction bearings
hardening of the rolls
camber on the rolls
V-block is used to
check the trueness of flat surfaces
check the surface roughness
NONE OF THESE
locate centres of round rods
Shift is a casting defect which
occurs as sand patches on the upper surface of a casting
results in a mismatching of the top and bottom parts of a casting
occurs near the ingates as rough lumps on the surface of a casting
results in general enlargement of a casting
The consumable electrode is used in
TIG arc welding
Submerged arc welding
Carbon arc welding
MIG arc welding
In shielded arc welding
welding rod coated with fluxing material is used
large electrode is used
welding rod coated with slag is used
None of the above
The advantage of thermit welding is that
All of the above
weld cools almost uniformly
results in a minimum problem with internal residual stresses
all parts of the weld section are molten at the same time
Which of the following methods can be used for manufacturing 2 metre long seamless metallic tubes
Extrusion and rolling
rolling
extrusion
Drawing
In welding copper alloys with TIG arc welding
direct current with reversed polarity is used
alternating current is used
direct current with straight polarity is used
any one of these
The temperature produced by oxy-hydrogen flame is about
2100° C
2400° C
1800° C
3200° C
The accuracy of micrometers, calipers, dial indicators can be checked by a
plug gauge
ring gauge
Slip gauge
feeler gauge
1
2
5
10
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