অ্যাডভান্সড ওয়েল্ডিং MCQ
21.
What is the temperature of the positive electrode in metal arc welding?
2300°C
2400°C
2500°C
2600°C
22.
Oxy-acetylene process is most suited for which of the following process of joining?
Metal wires
Metal sheets
Metal tubes
Metal bars
23.
A riveted joint in which every rivet of a row is opposite to other rivet of the outer row, is known as-
chain riveted joint
diamond riveted joint
criss-cross riveted joint
zig-zag riveted joint
24.
Which of the following characteristic does not define a coated electrode?
Maintenance of arc
Protection frum oxygen
Protection from nitrogen
Preventing other elements into molten metal
25.
What is the percentage of carbon present in low alloy steel?
0.15%
0.2%
0.25%
0.3%
26.
Which bead character is seen due to too high welding current?
Pilling of metal
Pilling of weld metal
Excess splatter
Small bead formation
27.
If the rivets in adjacent rows are staggered and the outermost row has only one rivet, the arrangement of the rivets is called-
chain riveting
zig zag riveting
diamond riveting
criss-cross riveting
28.
What is the capacity of an automatic welding machine?
100A 10 200A
300A to 400A
500A to 700A
800A to 3000A
29.
For what thickness of a material, in an oxy acetylene is a welding rod used?
10 mm
15 mm
20 mm
25 mm
30.
What is the flame temperature of city gas?
1500°C
1600°C
1700°C
1800°C
31.
Which material is not used for making non- consumable electrodes?
Carbon
Graphite
Sodium
Tungsten
32.
What is the amount of carbon contained by a soft steel wire?
0.1% to 0.18%
0.15% 10.00.22%
0.18% to 0.26%
0.2% to 0.27%
33.
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
34.
What is the amount of electric energy required per kg in de welding operation?
1-4 kWh
3-7 kWh
4-9 kWh
6-10 kWh
35.
A riveted joint in which the number otrivets decrease from innermost to outer most row is called-
chain riveted joint
diamond rivered joint
criss-cross riveted joint
zig-zag riveted joint
36.
What is the efficiency of an AC welding transformer?
0.6
0.7
0.8
0.9
37.
Which of the following could be considered as a related process?
Explosive
Oxy-Hydrogen welding
Oxy-Acetylene cutting
Electron-beam
38.
Diamond riveted joint can be adopted in the case of following type of joint.
butt joit
lap joint
double riveted lap joints
all types of joins
39.
Which of the following types of fuel gas is commonly used in gas welding?
Biogas
Coal gas
Acetylene
Methane
40.
What is the capacity of a light manual welding machine?
100A to 200A
300A to 400A
500A to 700A
800A to 3000A