Preparatory Questions (Set – 5)

1.    Which of the following NDT methods can only detect surface breaking defects?

    1. MPI
    2. DPI
    3. UT
    4. RT

2.     Which of the following is applicable to electrode efficiency?

    1. The mass of metal deposited as a percentage of the mass core wire melted
    2. Iron powder electrodes have efficiencies above 100%
    3. Electrodes of high efficiencies tend to procedure welds of a smooth flat profile
    4. Both a and b

3.    Cellulose electrodes have which of the following properties?

    1. Viscous slag, large volumes of shielding gas and UTS values above 90,000 PSI
    2. Large volumes of shielding gas, hydrogen contents>15 ml per 100g of weld metal deposited and should be never baked
    3. Large volumes of shielding gas, high spatter contents and hydrogen levels < 15 ml per 100g of weld metal deposited
    4. None of the above

4.     Drooping characteristic power source is suitable for

    1. TIG and MMA
    2. MIG and TIG
    3. TIG and PAW
    4. All of the above

5.     What is a weld junction?

    1. The area containing the HAZ and the weld metal
    2. The boundary between the fusion zone and the HAZ
    3. Both 1 and 2
    4. None of the above

6.     The likelihood of a brittle fracture in steels will increase with

    1. A slow cooling rate
    2. A reduction in-service tem to sub-zero conditions
    3. Both 1 and 2
    4. All of the above

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

    1. 100% CO2
    2. 100% argon
    3. 80% argon 20%CO2
    4. 98% argon 2% oxygen

8.     When visually inspecting a completed single V-butt weld cap you would certainly assess

    1. cap height
    2. toe blend
    3. weld width
    4. All of the above

9.      What two functions in arc welding must be in equilibrium to enable a stable arc to be established?

    1. Arc voltage
    2. Current
    3. Wire-electrode feed rate
    4. Metal burn- off rate

10.   Which of the following destructive tests is not normally required for welder performance test?

    1. Bend tests
    2. Macro examination
    3. Impact tests
    4. Fracture tests

11.   In the welding of austenitic pipe work, the bore is usually purged with argon to

    1. Prevent formation of porosity in the weld
    2. Prevent burn-through in the root run
    3. Prevent oxidation of the root bead
    4. None of the above

12.   MIG welded joints are susceptible to lack of fusion problems. Due to

    1. Poor maintenance of equipment
    2. Incorrect settings
    3. Poor inter-run cleaning
    4. All the above

13.   Reason for Incomplete penetration in a single ‘V’ butt joint could be

    1. Root gap too large
    2. Root gap too small
    3. Step up rectifier
    4. High heat input

14.   During examination of a aluminium weld joint, macro etching may reveal:

    1. Weld defect
    2. Weld decay
    3. Linear indications
    4. Lack of inter-run penetration

15.   What type of power characteristic is required for manual welding?

    1. Constant voltage
    2. DC generator
    3. Drooping characteristic
    4. None of the above

16.   Excessively high voltage in submerged arc welding would result in:

    1. Lack of fusion and spatters
    2. Excessive flux melting
    3. Slag removal difficulties
    4. None of the above

17.   Undercut is principally caused by:

    1. Excessive amps
    2. Excessive volts
    3. Excessive travel speed
    4. All the above

18.   Which electrode classification would be relevant to AWS A5.1-81?

    1. E 6013
    2. E 5133
    3. E 7018 – G
    4. None of the above

19.   Hydrogen controlled electrodes were developed principally for

    1. The prevention of porosity
    2. The prevention of cracking
    3. Replacing the costly electrodes
    4. None of the above

20.   E6014 electrode would most probably used for welding

    1. Low pressure pipework
    2. High- pressure pipework
    3. Vertical down welding in heat exchange
    4. When  low hydrogen welds are required

21.   For welding of carbon steel with thickness more than 100 mm, which of the following welding processes would be the most suited?

    1. TIG
    2. Electro-slag
    3. Manual metal arc
    4. Plasma arc

22.   Lap joints would have a

    1. fillet weld
    2. corner joint
    3. butt-weld with single V
    4. single-bevel butts with long edges

23.   Cold lapping is used for

    1. Lack of fusion at the toe of a weld
    2. Overlap
    3. Cold cracking
    4. Both a and b

24.  ‘Toe blending’ is important as it may affect

    1. Corrosion
    2. Fatigue life
    3. Both a and b
    4. All of the above

25.   A welding procedure is useful to :

    1. Give information to the welder
    2. Give information to the inspector
    3. Give ‘confidence’ to a product
    4. All of the above

26.   The inclusion of an inductance in the welding circuit when using MIG/MAG welding process is to ;

    1. Control the rate of patter in the dip transfer mode
    2. Enable the welder to weld in position with the spray transfer mode
    3. Both a and b
    4. None of the above

27.   Welding flux

    1. Melts the base metal
    2. Protects the weld pool from atmospheric contamination
    3. Both a and b
    4. None of the above

28.   In a bend test the face of the specimen is in tension and the root is in compression. What type of test is being carried out?

    1. Root bend test
    2. Side bend test
    3. Face bend test
    4. None of the above

29.The British code for visual inspection requirements is:

    1. BS 4872
    2. BS 499
    3. BS 4870
    4. None of the above

30.   With respect to welding procedure specification (WPS), a change in essential variable will lead to

    1. Re-qualification of the weld procedure.
    2. Possible changes in the weld’s microstructure.
    3. Possible changes in the mechanical properties.
    4. All the above

31.   The steel composition in a structural contract is changed from 0.15% carbon 0.6% manganese, to 0.2% carbon 1.2% manganese. This might influence the incidence of:

    1. Heavy porosity with blow holes
    2. Cracking in the weld area
    3. Underfill in filler pass
    4. Lack of fusion

32.   The predominant structure of an hyper-eutectoid steel that has been quenched at above its upper critical point will be:

    1. Austenite
    2. Martensite
    3. Ferrite
    4. Sorbite

33.   Which of the following steels is likely to be more susceptible to hydrogen cracking?

    1. Carbon equivalent of less than 0.15 %
    2. Carbon equivalent of 0.25%
    3. Carbon equivalent of 0.18%
    4. Carbon equivalent of 0.43%

34.   A correctly made tack weld should slope from the middle to the ends in order to:

    1. Aid better penetration at the join-up
    2. Prevent porosity
    3. Both a and b
    4. None of the above

35.   The use of flux with gas shielded metal arc welding allows:

    1. Sheet metal to be welded
    2. A stable arc when using high current densities
    3. Aluminium to be welded
    4. Less dilution of the weld by the parent metal

36.   A steel described as QT will have improved tensile properties because it has been

    1. Been heat-treated
    2. Been quality tested
    3. Both a and b
    4. None of the above

37.   In the submerged arc welding process, the use of excessive high voltages would result in?

    1. Insufficient flux melting
    2. Excessive flux melting
    3. Slag removal difficulties
    4. Excessive spatter

38.   What does the 70 represent on an E70 10 AWS A5.1 classified electrode?

    1. 70 n//mm2 min UTS
    2. 70 grade steel
    3. 70,000 P.S.I min yield strength
    4. 70,000 PSI min UTS

39.   Which element in steel if present in significant amounts may lead to hot shortness

    1. Phosphorus
    2. Manganese
    3. Sulphur
    4. None of the above

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

    1. Calcium
    2. Phosphorus
    3. Hydrogen
    4. Copper

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