This set of Welding Multiple Choice Questions & Answers focuses on “Thermit Welding”.
1. In an iron thermit, how many moles of aluminium reacts with three moles of iron oxide to give nine moles of iron?
a) 6
b) 7
c) 8
d) 9
View Answer
Explanation: The thermit process, which is used for welding depends on the chemical reaction between oxide of iron and aluminium metal. According to this reaction, when 8 moles of aluminium reacts with 3 moles of iron oxide, then, 4 moles of aluminium oxide and 9 moles of iron is formed.
2. In the given figure of thermit welding apparatus, what does the question mark represents which part?
a) Sand plug
b) Crucible
c) Wax pattern
d) Slag basin
View Answer
Explanation: Around the parts which are to be united, superheated liquid steel is poured, which then effects in forming the weld. This process, hence, is a fusion welding process. The part represented by the question mark is the crucible.
3. In the given figure of thermit welding apparatus, what does the question mark represents which part?
a) Sand plug
b) Crucible
c) Wax pattern
d) Slag basin
View Answer
Explanation: None.
4. In the given figure of thermit welding apparatus, what does the question mark represents which part?
a) Riser
b) Workpiece
c) Runner
d) Wax pattern
View Answer
Explanation: In this apparatus of the thermit welding process, the question mark here represents the pattern made up of wax. This process is basically carried out in fusion welding.
5. In the given figure of thermit welding apparatus, what does the question mark represents which part?
a) Riser
b) Workpiece
c) Runner
d) Wax pattern
View Answer
Explanation: None.
6. In the given figure of thermit welding apparatus, what does the question mark represents which part?
a) Riser
b) Workpiece
c) Runner
d) Wax pattern
View Answer
Explanation: In this figure, the question mark is represented by the runner. This process is carried out at fusion welding.
7. In the given figure of thermit welding apparatus, what does the question mark represents which part?
a) Riser
b) Runner
c) Sand plug
d) Preheating
View Answer
Explanation: The part represented by the question mark is the sand plug. Superheated liquid steel is poured, which then effects in forming the weld. This process, hence, is a fusion welding process.
8. After the achievement of welding temperature, electrical connections are established to complete the weld.
a) True
b) False
View Answer
Explanation: The superheated melt is heated from the crucible gets poured around the metal parts. As the welding temperature is achieved, there is an application of mechanical pressure to the weld.
9. What is the magnitude of temperature produced in a thermit reaction?
a) 2500°C
b) 3000°C
c) 3500°C
d) 4000°C
View Answer
Explanation: Thermit welding is called as fusion welding. A superheated melt operates in this type of melt. The heat that is produced has the temperature approximately twice than that of the melting point of steel, which is about 3000°C.
10. Thermit welding is used for making rail tracks.
a) True
b) False
View Answer
Explanation: A superheated melt operates in this type of melt. The production of pipes, rail tracks, shafts or big gears can be done using thermit pressure welding. Thermit welding is called as fusion welding.
Sanfoundry Global Education & Learning Series – Welding.
To practice all areas of Welding, 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]
- Check Mechanical Engineering Books
- Practice Mechanical Engineering MCQs
- Apply for Mechanical Engineering Internship
- Check Metallurgical Engineering Books
- Practice Casting, Forming and Welding I MCQ
