Preparatory Questions (Set – 1)

1. The Discontinuity which results from the entrapment of gas within the weld cross-section is known as:

1. 1. Undercut
   2. Lack of penetration
   3. Lack of fusion
   4. Porosity

2. A discontinuity can be called as defect only when

1. 1.  It is a Linear indication
   2.  It is a rounded indication
   3.  It exceeds the code limit
   4.  if it is a crack

3. Due to the improper termination of the welding arc which discontinuity is likely to be occurred

1. 1. Undercut
   2. Incomplete penetration
   3. Overlap
   4. Crater crack

4. Dye-Penetrant test is carried out to detect

1. 1. Surface Discontinuity
   2. Surface as well as subsurface discontinuity
   3. Both a and b
   4. Neither a nor b

5. In SMAW, E7018 belongs to which F group.

1. 1. F 4
   2. F 2
   3. F 1
   4. F 8

6. In SMAW, which one of the following electrode doesn’t belong to F2 group

1. 1. E 6010
   2. E 6012
   3. E 6013
   4. E6014

7. Who is responsible for the qualification of welding procedures?

1. 1. contractor or manufacturer
   2. welding Engineer
   3. welding operator
   4. Third party Inspection agency

8. Stray arc strikes are undesirable since they:

1. 1. Leave a poor surface finish
   2. Cause weld metal cracking.
   3. Reduce corrosion resistance.
   4. Cause local hardening and cracking in the parent material.

9. A metallurgical problem most associated with submerged arc welding is:

1. 1. Hydrogen cracking in the HAZ
   2. Solidification cracking in the weld metal
   3. Hydrogen cracking in the weld metal
   4. Lamellar tearing in the weld metal

10. Oxy pressure and nozzle size in flame cutting would influence:

1. 1. The temperature required for cut initiation
   2. The ability to cut stainless steels
   3. The depth of the cut obtainable
   4. None of the above

11. A code of practice is:

1. 1. A standard for workmanship only
   2. A set of rules for manufacturing a specific product
   3. Levels of acceptability of a weldment
   4. None of the above

12. Movement of the arc in MMA welding by magnetic forces is called:

1. 1. Arc deviation
   2. Arc misalignment
   3. Arc blow
   4. Arc eye

13.  A metallurgical problem most associated with submerged arc welding is:

1. 1. Hydrogen cracking in the HAZ
   2. Solidification cracking in the weld metal
   3. Hydrogen cracking in the weld metal
   4. Lamellar tearing in the weld metal

14.  Which electrode deposits weld metal with the greatest ductility and resistance to cracking?

1. 1. Rutile.
   2. Cellulosic.
   3. Basic.
   4. Oxidising.

15.  In positional MMA welding on pipework, welders are having difficulty in obtaining good capping profiles when welding in the overhead position. Would you:

1. 1. Advise them to increase the current.
   2. Advise them to increase the voltage.
   3. Ask for a new welding team.
   4. Suggest the use of a smaller diameter electrode.

16.  A common gas mixture used in MIG welding nickel alloys, to combine good levels of penetration with good arc stability would be:

1. 1. 75% argon and 25% CO2
   2. 100% argon
   3. 80% argon and 20% CO2
   4. 98% argon and 2% CO2

17.  MMA welding of low alloy steels is more likely to be performed with:

1. 1. Cellulosic electrodes.
   2. Rutile electrodes.
   3. Iron oxide electrodes
   4. Basic hydrogen controlled electrodes

18.  Which of the following tests would indicate the toughness of weld metal/parent metal – HAZ?

1. 1. Tensile Test
   2. Root bend Test
   3. Hardness Test
   4. Charpy v-notch

19.  Pre-heating of carbon steel in manual metal arc welding is carried out to minimize the risk of:

1. 1. Parent metal cracking
   2. Scattered porosity
   3. Undercut
   4. Lack of fusion

20.  Hot shortness is a term used to indicate:

1. 1. Underfill
   2. Solidification cracking
   3. Hydrogen induced cracking
   4. Hot crack

21. In the welding of austenitic stainless steels, the electrode and plate materials are often specified to be low carbon content. The reason for this:

1. 1. To prevent the formation of chromium carbides
   2. Minimize distortion
   3. To prevent cracking in the weld
   4. All of the above

22.  Is it permissible to allow a single pass butt weld to cool down between weld passes?

1. 1. It depends on the specification requirements
   2. It is allowed if welding is carried out in a hot and humid environment
   3. It depends on the condition of HAZ
   4. All of the above

23.  Why shielding of arc is required during an arc welding process ?

1. 1. To protect the weld pool from hydrogen, helium and molybdenum
   2. To protect the HAZ region
   3. To protect the weld pool from the atmosphere
   4. All of the above

24.  Which of the following defects would show up as light indications on a radiograph?

1. 1. Tungesten inclusion
   2. Lack of penetration
   3. Excessive cap height and incomplete root penetration
   4. All of the above

25. While doing a pipe to pipe weld (circumferential seam), 610mm diameter with no internal access, which of the following techniques is most likely to be used, considering radiography using x-ray,

1. 1. SWSI
   2. DWSI
   3. SWSI – Y
   4. SWSI – X

26. A fatigue cracks fracture surface is:

1. 1. Hill top
   2. Smooth
   3. Zig saw fit
   4. None of the above

27.  Which of the following elements, if present in significant quantities in steel, may lead to cold shortness

1. 1. Phosphorus
   2. Sulphur
   3. Silicon
   4. Copper  + Nickel

28.  Lamellar tearing has occurred in a steel fabrication before welding could, which of the following test methods could have detected it?

1. 1. Ultrasonic
   2. Radiographic testing
   3. Magnetic particle
   4. It could not be found by any testing method

29.  The strength of the fillet weld is primary controlled by:

1. 1. Leg length
   2. Throat thickness
   3. Weld thickness
   4. All of the above

30.  Which of the following welding processes / technique is likely to be used for the repair welding of localized porosity in a butt weld

1. 1. MMA, Submerged arc
   2. Mechanised MAG
   3. All of the above
   4. None of the above