CWB Exam Questions and Answers (Graded A) CWB Exam Questions and Answers (Graded A) CWB Exam Questions and Answers (Graded A) CWB Exam Questions and Answers (Graded A)
1.To measure the strength of a welded joint what mechanical test would you prescribe?
a) A transverse weld tension test
b...
1.To measure the strength of a welded joint what mechanical test would you prescribe?
a) A transverse weld tension test
b) A charpy test.
c) A CTOD test.
d) An all weld metal tension test. e) A side bend test. - ANSWER-a) A transverse weld
tension test
2. Select the cutting process that would provide the narrowest heat affected zone when
cutting 12.5 mm (0.5 in) thick carbon steel.
a) Oxy-acetylene cutting.
b) Air-carbon arc cutting.
c) Oxy-propane cutting.
d) Plasma arc cutting.
e) Laser beam cutting - ANSWER-e) Laser beam cutting
3. Which of the following refers to a welder test where a pipe assembly is placed
vertically and the joint welded in the horizontal position without rotating the assembly?
a) 1G
b) 2G
c) 3G
d) 5G
e) 6G - ANSWER-b) 2G
4. Which of the following imperfections is normally considered as unacceptable
regardless of size or location?
a) Porosity.
b) Crack.
c) Inadequate penetration.
d) Lamination.
e) Burn-through. - ANSWER-b) Crack.
5. Select the correct penetrameter thickness for 2% sensitivity when radiographing a
weldment 1 .25 inches in thickness.
a) 0.012 in.
b) 0.015 in.
c) 0.025 in
d) 0.030 in. - ANSWER-c) 0.025 in
,6. Which of the following statements concerning porosity is true?
a) Porosity cannot be trapped within a weld.
b) Porosity moves up through later passes and will show only in a final pass.
c) Porosity is restricted to the centre line of a weld.
d) Porosity can result from faulty welder technique.
e) Porosity can be dissipated by an appropriate heat treatment. - ANSWER-d) Porosity
can result from faulty welder technique.
7. An irregular, dense white spot is seen on the radiograph of a weld. Assuming it was
caused by the welding process used, which one of the processes below would be
responsible?
a) SMAW process.
b) GTAW process.
c) GMAW process.
d) ST process.
e) ESW process. - ANSWER-b) GTAW process.
8. Which of the following operations is known to result in the emission of ionizing
radiation at levels dangerous to human health?
A) shield metal arc welding.
B) Plasma arc welding.
C) Operation of high voltage portable generator sets.
d) Radiographic inspection.
e) Electroslag and electrogas welding. - ANSWER-d) Radiographic inspection.
9. The ultrasonic transducer is pressed against the plate of a welded joint. The sound
travels
longitudinally through the plate to the opposite side. The signal seen on the UT screen
that comes from this opposite side of the plate:
a) Is the initial pulse signal.
b) Is the back reflection signal.
c) Is the front reflection signal.
d) Must be equal in amplitude to any defect signal.
e) Cannot be used for establishing the thickness of the material under test. - ANSWER-
b) Is the back reflection signal.
11. Which of the following is a stainless steel electrode?
a) E4918-1
b) E4918-A1
c) E4818
d) E308-16
e) E4111 - ANSWER-d) E308-16
12. Reverse polarity refers to the use of a:
a) AC power source, electrode +
b) DC power source, electrode+
, c) AC power source, electrode-
d) DC power source, electrode- - ANSWER-b) DC power source, electrode+
16. An advantage of an AC welding circuit is:
a) It is best used with large electrodes on thin materials.
b) It is best used with small electrodes on thin sections.
c) It helps to eliminate arc blow.
d) It minimizes internal undercut. - ANSWER-c) It helps to eliminate arc blow.
17. The resistance of steel to failure by brittle fracture is commonly assessed by
conducting a:
a) Rockwell C hardness test.
b) Tensile test.
c) Chemical analysis.
d) Hydrogen embrittlement test.
e) Notched bar impact test. - ANSWER-e) Notched bar impact test.
18. Which one of the following SMAW electrodes is restricted to horizontal and flat
position welding?
a) EXX18
b) E4916
c) EXX10
d) E4924
e) E4914 - ANSWER-d) E4924
19. The mechanical test used to determine the ability of a material to resist failure by
brittle fracture requires the use of:
a) A tensile test specimen.
b) A bend test specimen.
c) A compression test specimen.
d) An impact test specimen .
e) A spectrographic test. - ANSWER-d) An impact test specimen .
20. Select the electrode that would be best suited for welding high sulphur steels in the
flat position:
a) E4924
b) E4914
c) E4927
d) E4918 - ANSWER-d) E4918
13. Which welding process(es) can result in metallic inclusions in the weld?
a) SMAW.
b) FCAW.
c) GMAW.
d) GTAW
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