Preparatory Questions (Set – 2)

1. Stress relieving is not helpful in which of the following cases?

1. Softening the steel
2. Lowering the peak residual stress
3. Improving resistance to stress corrosion cracking
4. Improving dimensional stability after machining

2. Stray arcing may be regarded as a serious defect because:

1. It may reduce the thickness dimension of a component
2. It may cause liquation cracks
3. It may cause hard zones
4. All the above

3. Slag inclusions would occur with:

1. Shielded metal arc welding
2. Metal inert gas welding
3. Undercut and underfill
4. Lack of Penetration

4. Stress relieving is not helpful in which of the following cases?

1. In improving resistance to stress corrosion
2. In lowering the peak residual stresses
3. In softening the metal
4. In improving dimensional stability after machining

5. What is the ratio between the leg length and the design throat thickness on a mitre fillet weld with equal leg lengths?

1. 1 to1
2. 2 to 1
3. 1.414 to 1
4. All of the above

6. The most serious type of defect (s) is (are);

1. Lack of penetration
2. Cracks
3. Lack of fusion
4. All the above

7. When ‘hydrogen control’ is specified for a Shielded metal arc welding project, the electrode would normally be;

1. Cellulosic
2. Iron oxide
3. Acid
4. Basic

8. When manual metal arc welding is being carried out on an open construction site, which group of welders are most likely to require continuous monitoring?

1. Concrete shuttering welding teams
2. Pipe welding teams
3. Expert riggers and foremen
4. Operation In-Charge

9. A low hydrogen electrode, according to BS 639, would contain:

1. No hydrogen.
2. Less than 15 ml of hydrogen per 100 grams of deposited weld metal
3. Less than 15 ml of hydrogen per 1000 grams of deposited weld metal
4. More than 15 ml of hydrogen per 100 grams of deposited weld metal

10. Two low carbon steel pipes, 150mm diameter and 6mm wall thickness, are to be butt-welded using the TIG process. To ensure a full-strength joint, which of the following preps is most suitable?

1. Open single bevel
2. Open single V
3. Open square preparation
4. All of the above

11. Macroscopic examination requires any specimen to be inspected:

1. Once, after etching
2. Twice, before and after etching
3. No need to inspect before etching
4. None of the above

12. In a fatigue failure the appearance of the fracture surface is characteristic. It would be;

1. Rough and torn
2. ‘Chevron’-like
3. Smooth
4. None of the above

13. Toe blending is important as it may affect;

1. Corrosion
2. Fatigue life
3. Overlap type defects
4. All the above

14. Undercut is normally assessed by;

1. Its depth
2. Its length
3. It’s blending
4. All the above

15. Welds made with high heat inputs show a reduction in which of the following properties?

1. Ductility
2. Toughness
3. Fatigue strength
4. Mechanical strength

16.  If pipe bores are not matched correctly it can result in:

1. Lack of root penetration
2. The incorrect flow of water
3. Excessive undercut
4. High preheating during welding

17. In Shielded metal arc welding of low carbon steel, which electrode flux will yield the greatest degree of penetration?

1. Iron powder
2. Rutile
3. Cellulosic
4. Low hydrogen

18. The most common type of defect found in a structure that is in operation for a longer period of time;

1. Fatigue cracking
2. Crystallization
3. Cold Cracking
4. Stress gradient

19. The weld dimension used to indicate the minimum strength of a fillet weld is:

1. Leg length
2. Throat thickness
3. Width of bead
4. Length of weld element

20. You would certainly recognize a hydrogen controlled flux covered electrode from its:

1. Colour
2. Length
3. Trade name
4. BS639/AWS code letter

21. Basic coated electrodes possess which of the following properties;

1. High mechanical properties may be used to produce welds of high deposition rates and to produce welds of low hydrogen content
2. Low hydrogen content welds, good stop/start properties and high strength
3. Low carbon content welds, friable slag and high strength
4. All of the above

22. Which is the hardest part of a multi-pass welded joint, considering no post weld heat treatment has been done?

1. The HAZ of the cap
2. The HAZ of the root
3. The root
4. The root, and cap

23. Which of the following is applicable to a plate lamination?

1. They originate in the parent material
2. They are mainly caused by hydrogen entrapment
3. Both 1 & 2
4. None of the above

24. A black triangular flag used in conjunction with a weld symbol as to en 22553 means:

1. Be cautious while welding
2. Only E 7018 to be used
3. Welding to be carried out on-site (field weld)
4. All of the above

25. Which of the following is likely to be considered an essential variable in a welding procedure?

1. A change in welding position from Vertical to Overhead
2. A change from an electrode classified to AWS E 6012  to an electrode E 7018
3. A change in preheat temp from 110⁰ C to 165⁰ C
4. All of the above

26. Which of the following flame types would you expect to be used for the cutting of mild steel?

1. Neutral flame
2. Carburizing flame
3. Oxidizing flame
4. None of the above

27.  Which of the following is used for a crater crack?

1. Tearing
2. Fatigue crack
3. Star crack
4. Lap

28. Cold lapping is another term for:

1. Lack of fusion at the toe of a weld
2. lack fusion between weld metal and HAZ
3. undercut on root pass
4. both a and b

29. The throat thickness of a ¾ inch fillet weld is?

1. 27.5mm
2. 24mm
3. 13.5mm
4. 12.5mm

30. To test a component for vibrational loading, a suitable mechanical test would be:

1. Fatigue
2. Impact
3. Compressive
4. Tensile