Machine Design Questions and Answers – Welded Joints

This set of Machine Design Multiple Choice Questions & Answers (MCQs) focuses on “Welded Joints Basics”.

1. 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.

2. 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. 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.
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4. 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. 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.
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6. 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. 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.
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8. 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. 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.
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10. 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.

Sanfoundry Global Education & Learning Series – Machine Design.
To practice all areas of Machine Design, here is complete set of 1000+ Multiple Choice Questions and Answers.

If you find a mistake in question / option / answer, kindly take a screenshot and email to [email protected]

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Manish Bhojasia - Founder & CTO at Sanfoundry
Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He lives in Bangalore, and focuses on development of Linux Kernel, SAN Technologies, Advanced C, Data Structures & Alogrithms. Stay connected with him at LinkedIn.

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