MCQs on Welded Joints
1 - Question
All welding processes require pressure along with heat.
a) Yes
b ) No, fusion doesn’t require
c) Can’t be stated
d) None of the listed
View Answer
Answer: b
Explanation: Welding processes involving only heat and no pressure are called the fusion welding processes.
View Answer
Answer: b
Explanation: Welding processes involving only heat and no pressure are called the fusion welding processes.
2 - Question
The capacity of welded structures to damp vibrations is quite good.
a) True
b) False
View Answer
Answer: b
Explanation: Capacity of welded joints to damp vibrations is poor.
3 - Question
Themit consists of a finely divided mixture of iron oxide and copper.
a) True
b) False
.
View Answer
Answer: b
Explanation: Thermite is a mixture of iron oxide and copper
4 - Question
Rails in the field are generally welded by using
a) Thermit welding
b) Gas welding
c) Electric arc welding
d) Forge welding
View Answer
Answer: a
Explanation: Wherever it is uneconomical to carry welding equipments, thermit welding is used.
5 - Question
In gas welding which of the following is generally used?
a) Oxygen-Hydrogen
b) Oxygen-Acetylene
c) Oxygen-Hydrogen or Oxygen-Acetylene
d) None of the mentioned
View Answer
Answer: c
Explanation: Intense heat is released I a controlled way and at a moderate temperature.
6 - Question
Among gas and electric arc welding, which has the higher rate of heating?
a) Gas welding
b) Electric arc welding
c) Gas welding and electric arc welding have equal rate of heating
d) Cannot be determined
View Answer
Answer: b
Explanation: Gas welding has a gas temperature of about 3200’C while arc temperature is about 40000’C.
7 - Question
Forge welding involves heating of parts to elastic stage and joint is prepared by impact force.
a) Yes
b) No, it is done up to plastic stage
c) Heating is done up to boiling point
d) None of the listed
View Answer
Answer: b
Explanation: Heating is done up to plastic stage.
8 - Question
Filler material is used in electric resistance welding.
a) Yes
b) No filler material used
c) Depends on the type of welding
d) None of the listed
View Answer
Answer: b
Explanation: No filler material is used. Only the heat released from resistance of metallic parts to current is used for melting the adjoining parts.
9 - Question
Which type of welding is generally used in automobile sector?
a) Electric arc welding
b) Electric resistance welding
c) Gas welding
d) Forge welding
View Answer
Answer: b
Explanation: Electric resistance welding can be easily automated and hence is used in automobile sector.
10 - Question
Hard peening is
a) Hammering the weld across the length while the joint is hot
b) Hammering the weld along the length while the joint is hot
c) Hammering the weld along the length while the joint is cold
d) Hammering the weld across the length while the joint is cold
View Answer
Answer: b
Explanation: Hammering is doe to relieve stresses and inducing compressive stresses to improve the fatigue strength of the joint.