MCQ
61. 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
62. 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
63. 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
64. What is the efficiency of an AC welding transformer?
0.6
0.7
0.8
0.9
65. What is the capacity of a light manual welding machine?
100A to 200A
300A to 400A
500A to 700A
800A to 3000A
66. Which of the following could be considered as a related process?
Explosive
Oxy-Hydrogen welding
Oxy-Acetylene cutting
Electron-beam
67. What is the capacity of an automatic welding machine?
100A 10 200A
300A to 400A
500A to 700A
800A to 3000A
68. In a neutral flame, what is the temperature in the inner core?
3200°C
2100°C
1250°C
2700°C
69. 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
70. 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
71. What is the flame temperature of city gas?
1500°C
1600°C
1700°C
1800°C
72. 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
73. 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%
74. What is the percentage of carbon present in low alloy steel?
0.15%
0.2%
0.25%
0.3%
75. Which of the following types of fuel gas is commonly used in gas welding?
Biogas
Coal gas
Acetylene
Methane
76. 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
77. What is the flame temperature of water gas?
2500°C
2800°C
2300°C
3100°C
78. Oxy-acetylene process is most suited for which of the following process of joining?
Metal wires
Metal sheets
Metal tubes
Metal bars
79. For what thickness of a material, in an oxy acetylene is a welding rod used?
10 mm
15 mm
20 mm
25 mm
80. Which material is not used for making non- consumable electrodes?
Carbon
Graphite
Sodium
Tungsten