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CWB 1 Exam 2024 Questions & Answers | 100% Correct | Verified, Exams of Boilers and Welding

Brunswick Community CollegeBoilers and Welding

CWB 1 Exam 2024 Questions & Answers | 100% Correct | Verified

Typology: Exams

2024/2025

Available from 03/05/2025

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CWB 1 Exam 2024 Questions & Answers
| 100% Correct | Verified
1. Which is not a recommended method for surface cleaning of a part for liquid penetrant examination?
a) Cleaning with organic solvents.
b) Blasting with shot or dull sand.
c) Cleaning with de-greasers.
d) Use of de-scaling solutions.
e) Ultrasonic cleaning methods. - ✔✔b) Blasting with shot or dull sand.
2. Which of the following weld defects is most likely to be missed by radiography in a weld:
a) Undercutting.
b) Porosity.
c) Slag inclusions.
d) Cracking.
e) Burn through . - ✔✔d) Cracking.
3. In the choices given below, metallographic tests would be the least informative with regard to the:
a) Presence of the non-metallic inclusions.
b) Grain structure in the weld and fusion zone.
c) Ability of the material to withstand repeated fluctuating loads.
d) Extent and structure of the heat affected zone.
e) Number of weld passes. - ✔✔c) Ability of the material to withstand repeated fluctuating loads.
4. In producing a drawing for a scale of 1:50, what would be the distance represented by a distance on
the drawing of 6 em?
a) 12 cm.
b) 30 cm.
pf3
pf4
pf5
pf8
pf9
pfa
pfd
pfe
pff
pf12
pf13
pf14
pf15
pf16
pf17
pf18
pf19
pf1a
pf1b
pf1c
pf1d
pf1e
pf1f

Partial preview of the text

Download CWB 1 Exam 2024 Questions & Answers | 100% Correct | Verified and more Exams Boilers and Welding in PDF only on Docsity!

CWB 1 Exam 2024 Questions & Answers

| 100% Correct | Verified

  1. Which is not a recommended method for surface cleaning of a part for liquid penetrant examination? a) Cleaning with organic solvents. b) Blasting with shot or dull sand. c) Cleaning with de-greasers. d) Use of de-scaling solutions. e) Ultrasonic cleaning methods. - ✔✔b) Blasting with shot or dull sand.
  2. Which of the following weld defects is most likely to be missed by radiography in a weld: a) Undercutting. b) Porosity. c) Slag inclusions. d) Cracking. e) Burn through. - ✔✔d) Cracking.
  3. In the choices given below, metallographic tests would be the least informative with regard to the: a) Presence of the non-metallic inclusions. b) Grain structure in the weld and fusion zone. c) Ability of the material to withstand repeated fluctuating loads. d) Extent and structure of the heat affected zone. e) Number of weld passes. - ✔✔c) Ability of the material to withstand repeated fluctuating loads.
  4. In producing a drawing for a scale of 1:50, what would be the distance represented by a distance on the drawing of 6 em? a) 12 cm. b) 30 cm.

c) 50 cm. d) 240 cm. e) 300 cm. - ✔✔e) 300 cm.

  1. 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. - ✔✔d) An impact test specimen.
  2. The cooling rate of aT-joint is: a) Less than that in a butt joint. b) Greater than that in a butt joint. c) Greater than that in a butt joint only where the carbon equivalent is high. d) Greater at the mid-section than at the start. e) Greater at the mid-section than at the finish. - ✔✔b) Greater than that in a butt joint.
  3. What are slag and non-metallic inclusions usually caused by? a) Moisture in the weld joint. b) High welding current. c) Loss of shielding gas. d) Inadequate interpass cleaning. - ✔✔d) Inadequate interpass cleaning.
  4. Where deviations from the drawings are warranted the inspector should do which of the following? a) Authorize approval of the changes. b) Obtain official approval for the changes.
  1. From the welding problems identified below which one of the five does not fit the pattern established by the other four? a) Insufficient throat. b) Incorrect bevel angle. c) Loss of shielding gas. d) Improper fit up. e) Use of wrong consumable. - ✔✔a) Insufficient throat.
  2. A 10 mm fillet weld has a nominal: a) Throat dimension of 10 mm. b) Area of 10 sq. mm. c) Leg size of 1 0 mm. d) Face width of 10 mm. - ✔✔c) Leg size of 1 0 mm.
  3. Which welding process has an arc drawn between the workpiece and the member being welded to it? 0 a) SAW. b) CAW-G. c) PAW. d) EGW. e) SW. - ✔✔e) SW.
  4. When performing liquid penetrant examination, excess penetrant removal comes after which one of the following penetrant steps: a) Application of developer. b) Application of penetrant c) Penetrant dwell time. d) Final surface cleaning.

e) Drying of the material under test. - ✔✔c) Penetrant dwell time

  1. Which of the following welding processes uses a non-consumable electrode? a) GMAW. b) GTAW. c) SMAW. d) FCAW. e) ESW. - ✔✔b) GTAW.
  2. The primary use for radiographic and ultrasonic inspection of welds during construction is to: a) Assess weld quality. b) Locate areas in procedure test specimens that are sound for destructive testing. c) Locate defective areas for cut-out. d) Be used in conjunction with destructive test methods to inspect production welds. - ✔✔a) Assess weld quality.
  3. Which one of the following is a true statement? a) A post weld stress relief heat treatment requires a higher temperature than an annealing treatment. b) A post weld stress relief heat treatment requires a lower temperature than an annealing treatment. c) Welded pipe assemblies must be heated all over for post weld heat treatment. d) Post weld heat treatment does not interact with cold-worked zones. e) Post weld heat treatment does not change the strength. - ✔✔b) A post weld stress relief heat treatment requires a lower temperature than an annealing treatment.
  4. When using the GMAW process, the type of transfer depends on which of the following? a) Shielding gas.

e) Flux leakage. - ✔✔c) Capillary action.

  1. The electrode used in flux cored arc welding is a: a) Hollow tubular wire containing an inner metal wire. b) Tubular wire containing flux or other ingredients. c) Solid wire with an oxide/flux coating. d) Hand held rod with flux in the core - ✔✔b) Tubular wire containing flux or other ingredients.
  2. In magnetic particle inspection flux density is: Welding Fundamentals, Welding Inspection Exam Version E/2010- 2 a) Of little significance insofar as surface crack detection is concerned. b) The strength of the magnetizing current. c) The strength of the magnetic field. d) Effective only when examining a weld for subsurface defects. e) The ease with which a ferromagnetic material can be magnetized. - ✔✔c) The strength of the magnetic field.
  3. What is an important feature of a tungsten electrode? a) It has a low melting point. b) It has the ability to penetrate deeply. c) It has a high melting point. d) It has stabilizers in its core. e) It is triple deoxidized. - ✔✔c) It has a high melting point.
  4. A common ultrasonic transducer frequency used for weld inspection is the 2.25 MHz transducer. This means: a) It produces a wave form having 2.25 million cycles per hour. b) That at this frequency it has to be a shear wave transducer producing 25000 cycles per

second. c) Its ability to detect very fine defects is superior to a 1 MHz transducer. d) It produces 25 million cycles per second. e) It is ineffective in the longitudinal beam mode when applied to the task of locating laminations in steel plate. - ✔✔c) Its ability to detect very fine defects is superior to a 1 MHz transducer.

  1. For the FCAW, GMAW & SAW processes what does an increase in arc length do? a) Arc voltage does not change. b) Decreases the arc voltage drop across the arc. c) Increases the arc voltage drop across the arc. d) Amperage is increased. e) Makes no change to the amperage. - ✔✔c) Increases the arc voltage drop across the arc
  2. The purpose of the penetrameter image on a radiograph is to: a) Identify film contrast levels. b) Estimate flaw sizes in a weld. c) Provide film identification. d) Judge image quality. e) Indicate radiation field direction. - ✔✔d) Judge image quality.
  3. When welding high-manganese steels, which one of the following must be avoided? a) Using electrodes with a rutile coating. b) Welding with D.C. current. c) Welding with A.C. current. d) Contact with Argon shielding gas. e) Inhalation of welding fumes. - ✔✔e) Inhalation of welding fumes.
  4. Which one of the following gases does not produce a spray arc transfer with GMAW process?
  1. A guided root bend test on a weld test specimen would show: a) The weld ductility by measuring the difference in distance between gauge marks. b) Excessive reinforcement. c) The integrity of the face-weld. d) Lack of penetration or fusion. e) HAZ properties. - ✔✔d) Lack of penetration or fusion.
  2. Acetylene cannot be used safely at pressures greater than: a) 103 Kpa (15 psi). b) 172 Kpa (25 psi). c) 310 Kpa (45 psi). d) 552 Kpa (80 psi). e) 15167 KPa (2200 psi). - ✔✔a) 103 Kpa (15 psi).
  3. When assessing radiographic image sensitivity during weld inspection: a) Hole-type image quality indicators always provide a more reliable method of assessment. b) Wire-type image quality indicators always provide a more reliable method of assessment. c) The type of image quality indicator to be used is dependent upon the type of radiation source. d) Either standard hole-type or wire-type image quality indicators, when used properly, will provide the necessary tool to carry out valid evaluation of exposure sensitivity. e) Visual examination of the weld image should predominate over the appearance of the image quality indicator. - ✔✔d) Either standard hole-type or wire-type image quality indicators, when used properly, will provide the necessary tool to carry out valid evaluation of exposure sensitivity.
  4. The use of shielding gas pre-purge and post purge in the GTAW process enables: a) The easier ionization of the arc gap. b) The deoxidization of the parent plate in advance of the arc.

c) The welder to "see" the shielding gas flow before the weld commences. d) The workpiece and the electrode to be protected from oxidization. e) The workpiece and the torch to be cooled before and after welding. - ✔✔d) The workpiece and the electrode to be protected from oxidization.

  1. Which side of a fillet weld gauge is used for measuring the size of a concave faced fillet weld? a) Leg side. b) Straight side. c) Throat side. d) Face side. e) Toe side. - ✔✔c) Throat side.
  2. In rad iographic inspection, the term "film density" is used to describe the: a) Lightness or darkness of the image on the film. b) Weight of the film. c) Class of the film. d) % of the welds which are exposed to radiographic inspection. e) % of his time that the rad iographer spends exposing the film. - ✔✔a) Lightness or darkness of the image on the film.
  3. The two basic types of stud welding processes are: a) Cold and pressure stud welding. b) Capacitor discharge and arc stud welding. c) Submerged arc and flux cored stud welding. d) Flat and horizontal stud welding. e) Shop and field stud welding. - ✔✔b) Capacitor discharge and arc stud welding
  4. When the ultrasonic transducer or probe is in direct contact with the material under test the ultrasonic method is:
  1. Select the cutting process that would provide the narrowest heat affected zone when cutting 12. 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 - ✔✔e) Laser beam cutting
  2. The quantity that is impeded in a slope control circuit is: a) Voltage b) Amperage c) Inductance d) Reactance e) Resistance - ✔✔b) Amperage
  3. Which one of the following statements is applicable to welding fumes? a) Welding fumes may contain a condensed metallic component. b) Welding fumes only contain smoke elements (e.g., carbon) caused by surface contaminates. c) Personnel fume protection devices or appropriate safety equipment are not required while welding on stainless steel. d) Fumes from welding on galvanized steel are not harmful. e) Natural dilution ventilation is sufficient to remove fume from the welder's breathing zone. - ✔✔a) Welding fumes may contain a condensed metallic component.
  4. When using the gas shielded FCAW process, the gas flow will depend partly on : a) Diameter of the contact tip. b) The distance of the nozzle from the pressure container. c) Gas pressure and nozzle diameter d) The thickness of the material to - ✔✔c) Gas pressure and nozzle diameter

  1. When welding with the GMAW process, which of the following could change if the welder decides to switch gases? a) Penetration. b) Amperage. c) Transfer characteristics. d) Voltage. e) All four (4) items listed here could change. - ✔✔e) All four (4) items listed here could change

  2. Which one of the following is not the welding inspector's responsibility with respect to weldments requiring repairs? a) To see that they are made by qualified welders. b) To ensure that such weldments are correctly marked in order to indicate the location and nature of repairs. c) To judge the acceptability of the repaired welds. d) To ensure that proper welding procedure is followed. e) To assess the acceptance criteria in the applicable standard to determine if it is suitable for the job. - ✔✔e) To assess the acceptance criteria in the applicable standard to determine if it is suitable for the job.

  3. A backing gas is used to: a) Prevent root burn-through. b) Reduce root concavity. c) Support the molten root metal. d) Prevent root oxide contamination. - ✔✔d) Prevent root oxide contamination.

  4. What is the distance from the toe of the weld to the intersection of the horizontal and vertical members in an equal leg concave fillet weld?

b) Carbon and Manganese. c) Sulphur, Nickel and Boron. d) Chromium and Nickel. e) Calcium and Nitrogen. - ✔✔b) Carbon and Manganese.

  1. When the arc is visible in the SAW process it means that the: a) Process is working properly. b) Filler wire has run out. c) Voltage being used is incorrect. d) Flux cover has been lost. e) Final pass is underway. - ✔✔d) Flux cover has been lost.
  2. 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. - ✔✔b) GTAW process.
  3. If the root opening is too large on a joint welded from one side only without backing , which of the following is the probable consequence? a) It will be difficult to strike an arc. b) Lack of penetration will occur. c) An acceptable cap pass would be difficult to obtain. d) Burn through will occur. e) The electrode will not access the root. - ✔✔d) Burn through will occur
  1. Situations may arise where deviations from drawings and specifications covering the job may be necessary. In such cases, the inspector should: a) Make a decision based on sound welding inspection techniques. b) Make a decision based on the co-operation received from the fabrication shop. c) Tell the fabrication shop what should be done. d) Obtain official approval from the agency responsible for the design and approval of the work. - ✔✔d) Obtain official approval from the agency responsible for the design and approval of the work.
  2. What kind of defect can usually be observed running along the centre line of a weld? a) HAZ cracks b) Transverse weld metal crack c) Solidification crack d) Hydrogen blister e) Lamellar tear - ✔✔c) Solidification crack
  3. When using magnetic particle inspection method, which of the following would be incorrect with regard to crack detection in a weld cap? a) The magnetic field should be transverse to the crack direction. b) The crack should be transverse to the magnetic lines of force. c) The electric current for the magnetic field should flow in the direction of the crack. d) The weld surface should be clean. e) The magnetic particles must be able to penetrate the crack opening. - ✔✔e) The magnetic particles must be able to penetrate the crack opening.
  4. Defective or inadequate weld metal properties include: a) Low tensile strength, low hardness, all weld metal tensile test. b) Hardness tests, poor corrosion resistance, all weld metal tensile test. c) Low tensile strength, low yield strength, incorrect chemical composition. - ✔✔c) Low tensile strength, low yield strength, incorrect chemical composition.

SMAW welding? a) Switch from AC current to DC cu rrent. b) Switch from DC negative to DC positive. c) Switch to AC current from DC current. d) Arc blow does not occur with SMAW welding. e) Switch to a different electrode. - ✔✔c) Switch to AC current from DC current.

  1. Which area of a weld is most susceptible to cracking? a) In the covering pass. b) In a backing weld. c) In the root pass. d) In the fill layers. - ✔✔c) In the root pass.
  2. The specification for the cutting of a carbon steel plate calls for AAC. This is the acronym for: a) Acetylene argon cutting. b) Air carbon arc cutting. c) Automated arc cutting. d) Air arc cutting. - ✔✔b) Air carbon arc cutting
  3. Which of the following welding processes uses a non-consumable electrode: a) SMAW b) GMAW c) ESW d) SAW e) GTAW - ✔✔e) GTAW
  4. Arc blow is a phenomenon encountered when welding with what type of power source? a) AC

b) DC c) AC with high frequency d) Inverters e) All of the above - ✔✔b) DC

  1. A radiograph taken at a welded joint shows numerous round and elongated dark spots in the weld and in the parent material adjacent to the weld. These indications are likely to be: a) Stray arc strikes. b) Weld spatter. c) Tungsten inclusions. d) Chipping hammer marks. e) Surface porosity. - ✔✔d) Chipping hammer marks.
  2. The electrode that would be used for SAW is: a) E347T- 3 b) E120T5-G c) E90T1-D d) EM12K - ✔✔d) EM12K
  3. The term "cleaning action of the arc" when used with the GTAW process refers to: a) Oxide removal while welding. b) Removing grease & dirt from the weld area before welding is started. c) Inter pass cleaning of the weld. d) Dipping the electrode in a chemical solvent to ensure cleanliness before welding. e) Cleaning the electrode tip periodically. - ✔✔a) Oxide removal while welding.
  4. On an ultrasonic angle beam probe, the index point is: a) Checked on a calibration block.