Preparatory Questions (Set – 6)

1.  Which of the following processes joins metals plastically?

1. 1. Friction welding
   2. Resistance welding
   3. Plasma welding
   4. None of the above

2.    In submerged arc welding, excessive arc voltage may cause?

1. 1. Excessive penetration
   2. Change in weld metal composition
   3. Narrow weld width
   4. All of the above

3.   In a tensile test, a brittle material would be indicated if the fracture surface?

1. 1. Shows a reduction in size
   2. Is flat and featureless
   3. Breaks in the weld metal
   4. Breaks in the parent metal

4.   If steel attains improved creep properties at elevated temp, which one of the following elements would have helped in doing so?

1. 1. Tungsten
   2. Manganese
   3. Molybdenum
   4. Carbon

5.   Macroscopic exam requires any specimen to be inspected

1. 1. Twice after etching
   2. Twice, before and after etching
   3. Twice before etching
   4. All of the above

6.   Which of the following could be expected due to the presence of iron sulphide in the weld metal?

1. 1. solidification cracking
   2. hydrogen cracking
   3. Undercut and under fill
   4. Weld depression

7.   Incomplete root penetration in a butt joint could be caused by:

1. 1. excessive root face width
   2. excessive  root gap size
   3. low current setting
   4. both 1 and 3

8.   If the procedure doesn’t mention the requirements for visual inspection of a specimen then what should you do?

1. 1. Carry out normal visual inspection
   2. Seek advice from higher authority
   3. Carry out no visual inspection
   4. Re- write the requirements of the specification

9.   Chromium, when added to steel as an alloying element, has the effect of making the alloy more:

1. 1. Ductile
   2. Plastic
   3. Hardenable
   4. Malleable

10.   When a steel suffers hot shortness, it is mostly due to the presence of:

1. 1. Sulphur
   2. Phosphorous
   3. Silicon
   4. Manganese

11.   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. None of the above

12.   You have a macro section of a ‘T’ butt joint that shows a step-like defect lying outside the visible HAZ. What would this defect possibly signify?

1. 1. HAZ cracking
   2. Toe cracking
   3. Lamination
   4. Lamellar tearing

13.   The important point of high temperature steels is that:

1. 1. They can withstand creep failure
   2. They may suffer re-heat cracking problems
   3. They may suffer loss of toughness
   4. All the above

14.   A basic electrode would normally:

1. 1. Have superior mechanical properties
   2. Require baking before use
   3. Both 1 and 2
   4. Neither 1 nor 2

15.   Hot shortness is a term used to indicate:

1. 1. Lamellar tearing
   2. Solidification cracking
   3. Hydrogen cracking
   4. None of the above

16.   Which defect would you expect to get in TIG welds in non-deoxidised steel?

1. 1. Underfill and high reinforcements
   2. Porosity
   3. Tungsten inclusions
   4. Spatters

17.   The overall length of a pipeline can be affected by:

1. 1. Longitudinal shrinkage
   2. Angular shrinkage
   3. Circumferential shrinkage
   4. All of the above

18.   Which one of the following is not helpful in minimising angular distortion during welding?

1. 1. Use of double ‘V’ weld prep using balanced welding technique
   2. Pre-setting of work piece
   3. Applying post weld heat soak
   4. All of the above

19.   Percentage elongation of a metal undergoing a tensile test is a measure of:

1. 1. Elasticity
   2. Plasticity
   3. Ductility
   4. None of the above

20.   Argon purging on the root side is necessary in the TIG welding of stainless steel to:

1. 1. Avoid porosity in the root
   2. Obtain full penetration
   3. Obtain full fusion
   4. All of the above

21.   The toes of the cap on a butt weld:

1. 1. Must overlap on the external surface of a pipe or plate by at least 1.5mm
   2. Must be grounded
   3. Must not be grounded
   4. None of the above

22.   Why is hot – pass so-called?

1. 1. Because it is applied at a high amperage
   2. Because it is applied when the root is still hot
   3. Because it could cause ‘hot – shortness’
   4. Because it heat treats the root

23.   Is it permissible to allow a single ‘V’ butt weld to cool down passes?

1. 1. It is solely the decision of the welder
   2. It depends on the requirement of the procedure and specifications
   3. It is solely the decision of the welding inspector
   4. No, all welds should be completed before dropping the temperature to ambient

24.   Fluctuating load is: cyclic stresses, below the UTS on a weld component may lead to:

1. 1. Tensile failure
   2. Yield failure
   3. Fatigue failure
   4. Shear failure

25.   To measure accurately the root radius of a charpy or Izod specimen, which of the following can be used?

1. 1. A shadowgraph
   2. A Steel rule
   3. A Vernier caliper
   4. Steel Tape