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Chapter:

16. In welding strength of joint piece could be?

Equal to that of parent metal Greater than that of parent metal Equal or Greater than that of parent metal Is lesser than the parent metal

Equal or Greater than that of parent metal

The strength of perfectly welded joint is more than parent metal, due to formation of alloy. The alloy formation at welded portion makes it strongest portion while nearby zones where uncontrolled cooling take place because of heat is weakest zone (heat affected zone). In general we can say that on basis of strength: welded portion > parent material > heat affected zone.

Hint Answer

17. How many types of flames are re in welding?

1 2 3 4

3

There are three basic flame types: neutral (balanced), excess acetylene (carburizing), and excess oxygen (oxidizing) as shown below.

Hint Answer

18. Which of following gas welding process uses constant voltage?

Submerged arc welding Tungsten inert gas welding Stud welding Gas metal arc welding

Gas metal arc welding

Gas metal arc welding uses constant voltage. Tungsten inert gas welding does not use constant circuit voltage.

Hint Answer

19. In manufacturing of hole and shaft, maximum shaft diameter was 49.88 mm and minimum hole diameter was found to be 49.94 mm. It is a

Clearance fit Interference fit Transition fit None of the mentioned

Clearance fit

When size of smallest hole is more than size of biggest shaft n it is clearance fit.

Hint Answer

20. The oxy acetylene gas welding is a type of?

Endothermic reaction Exothermic reaction Neutral reaction Both endothermic reaction and exothermic reaction

Exothermic reaction

The oxy acetylene gas welding is a type of exormic reaction. 1 mole of acetylene can produce KJ/mol of heat.

Hint Answer

21. The portion of weld joint that is melted by heat of melting is called as __________

throat toe root puddle

puddle

The arc spot or ?puddle? weld is started by striking an arc on deck surface, causing a hole to form in deck. The weld operation n continues by depositing electrode material on beam or joist and allowing molten ?puddle? to engage penetrated deck.

Hint Answer

22. Which of following is a type of autogenous welding?

Arc Gas Brazing Resistance

Resistance

Resistance welding is inherently autogenous as re is no convenient way to apply a filler material.

Hint Answer

23. In which of following type of flame, oxygen is in excess proportion with acetylene?

Neutral flame Oxidizing flame Carburizing flame Both oxidizing flame and carburizing flame

Oxidizing flame

Oxidizing welding flames are produced when slightly more than one volume of oxygen is mixed with one volume of acetylene. Oxidizing welding flames are commonly used to weld zinc, copper, manganese steel, cast iron, etc.

Hint Answer

24. When size of smallest shaft is more than size of biggest hole n it is

Clearance fit Interference fit Transition fit None of the mentioned

Interference fit

When size of smallest shaft is more than size of biggest hole n it is interference fit.

Hint Answer

25. The inner cone of flame in welding has following nature?

Highest temperature Coldest temperature Moderate temperature Uncertain

Highest temperature

The inner cone of flame has highest temperature (3500°C). The outer flame has lowest temperature.

Hint Answer

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Lathe Machines, Shaping and Slotting

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Milling, Drilling and Reaming

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Grinding, Surface Finishing Operations and Unconventional Machining Processes

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Metrology, Welding, Fusion-Welding Processes and Unconventional Welding Methods

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Powder Metallurgy, NC Part Programming and Metal Casting and Gating Systems

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Forming, Metal Forming Processes and Heat Transfer

Forming, Metal Forming Processes and Heat Transfer

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Topics

This Chapter consists of the following topics

Metrology

Welding

Fusion-Welding Processes and Unconventional Welding Methods

In welding strength of joint piece could be?

How many types of flames are re in welding?

Which of following gas welding process uses constant voltage?

In manufacturing of hole and shaft, maximum shaft diameter was 49.88 mm and minimum hole diameter was found to be 49.94 mm. It is a

The oxy acetylene gas welding is a type of?

The portion of weld joint that is melted by heat of melting is called as __________

Which of following is a type of autogenous welding?

In which of following type of flame, oxygen is in excess proportion with acetylene?

When size of smallest shaft is more than size of biggest hole n it is

The inner cone of flame in welding has following nature?

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