41.
The correct flame for preheating before cutting is
A
oxidizing flame
B
neutral flame
C
carburising flame
D
slightly carburizing flame
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The correct flame for preheating before cutting is
oxidizing flame
neutral flame
carburising flame
slightly carburizing flame
The welding machine, which is used to convert AC welding supply to DC welding supply is
Motor generator set
Engine generator set
Rectifier set
Welding transformer
In a gas cut plate, the cut is high quality although there is some surface roughness caused by vertical drag lines. This is due to
less preheating flame
impure cutting oxygen
too slow cutting speed
smaller size cutting nozzle
If L (mm) is the length of the inner cone of the flame, the tip-to-metal distance should be
L mm
L + 2 mm
L + 4 mm
L + 6 mm
The size of a welding machine is determined by
Input amperage
Output amperage
Open circuit voltage
Closed circuit voltage
The arc utilized in electric arc welding is a
High voltage, high current discharge
Low voltage, low current discharge
Low voltage, high current discharge
High voltage, low current discharge
If a worker has suffered from electric shock, he should be
given an alcoholic drink
given a cold drink
made to walk
kept warm and covered
Which type of fire extinguisher is used in a welding shop?
Foam type extinguisher
Dry powder extinguisher
extinguisher
Halon extinguisher
The position in which it is easiest to weld is
Flat
Vertical
Horizontal
Overhead
The top edge is melted round and the cut face is not smooth in gas cutting. This is due to
extremely slow cutting speed
insufficient acetylene pressure
the tip being held too high
too much cutting oxygen pressure
The electrode size refers to
diameter of its core wire
diameter (overall) of electrode
thickness of flux coating
length of electrode
If the blowpipe is moved to and fro frequently while cutting the kerf will
be more
of correct size
be less
not be affected
While gas cutting the nozzle should
almost touch the work
be 10 mm away from work
be 2 mm away from work
be 5 mm away from work
Which fuel gas is used for cutting deep under water?
Acetylene
Hydrogen
LPG
Methane
The electrodes are manufactured in two standard lengths namely
350 mm and 250 mm
350 mm and 450 mm
400 mm and 500 mm
12 inches and 10 inches
Single-V and single-U butt welds are used for sheets of thickness upto
10mm
5-15mm
10-20mm
15-25mm
The temperature of arc in case of arc welding is
2000°C
2600°C
3000°C
3600°C
In arc welding, arc initiation voltage is of the order
20-60V
60-100V
100-140V
140-180V
In resistance welding, two electrodes are made of
Aluminium
Copper
Iron
Bronze
Which of the following is an example of fusion welding?
Arc welding
Forge welding
Resistance welding
Thermit welding with pressure