CWB Level 2 All Modules Exam - Questions and Answers

CWB Level 2 All Modules Exam - Questions and Answers Fatigue cracks are one of several issues that threaten the life of welded structures. They begin as: A) Minute cracks and then grow under static loads B) Large cracks and then grow without the requirement for load C) Minute cracks and then grow under fluctuating stress D) Large cracks and then grow under static loads Radiographic inspection can be performed with the following types of radiation. A) Ultrasonic and magnetic particle B) Infrared and ultraviolet C) Photons and electrons D) Gamma and X-rays What range of density should a radiograph have according to CSA W59? A) 7.3 to 8.2 B) It should be calculated from the source size, thickness and object to source distance C) 2T to 4T (T is the plate thickness) D) 1.5 to 3.5 E) 300 to 3000 cd/m2 Electromagnetic radiation with wavelengths longer than visible light are: A) Infra red, ultrasonic and x-rays B) Gamma rays, microwave and radiowaves C) Radio, microwaves, and infrared rays D) X-rays, gamma rays, and ultra violet Increasing the voltage of the X-ray tube has which effect on the penetrating capabilities? A) Increases the penetration of the rays B) Decreases the penetration of the rays C) No effect on the penetrating capabilities D) Not applicable to operating parameters of X-ray tubes Given a source size of 4mm, a weld thickness of 25.4mm and a plate to source distance of 900mm, what is the geometric unsharpness? A) 0.113mm B) 141.7mm C) 0.007mm D) 0.0044mm E) 0.0282mm Gamma rays are emitted by which of the following sources? A) Electromagnets B) Low voltage X-ray tubes C) Radioisotopes D) Gamma Machines A Disadvantage of using X-ray tube is that is: A) Is very portable B) Requires an electrical source C) Has lower sensitivity D) None of the above Which of the following statement is correct? A) All codes require all backing bars to be machined off before radiography B) Backing bars need not be removed since they do not effect at all on the quality of the radiographic image C) CSA W59 does not require backing bars be removed but a badly fitted backing bar could interfere with interpretation of the radiograph D) Backing bars must always be removed to make room for IQI E) Backing bars must never be removed since they are an intregral part of the weld and must therefore be radiographed Source size, source to object distance, and object to film distance are factors that control: A) Contrast B) Sensitivity C) Film development time D) Definition What device is now commonly used for measuring the personal radiation dose of radiographic workers? A) Radiation survey meter B) Thermo-luminescent dosimeter (TLD) C) There is no method for measuring personal dose D) Personal audible alarm E) A colimator The presence of nickel stabilizes which crystal structure? A) HCP B) BCT C) FCC D) BCC Stainless steels derive their stainless property from the following alloying element: A) Nickel B) Carbon C) Iron D) Chromium The four main types of stainless steels used in welded fabrications are: A) High temperature, creep resistant, impact resistant and corrosion resistant B) Ferritic, austenitic, martensitic, and duplex C) High temperature, precipitation hardened, fracture resistant and ferritic D) Fracture resistant, austenitic, duplex, and super ferritic A stainless steel is said to be passivated when: A) An oxide layer is not present B) Carbides have precipitated on the grain boundaries C) A stable adherent oxide layer protects the surface D) A solution heat treatment was completed Which of the following is most likely to cause sensitization when welding austenitic stainless steels? A) Using low carbon base and filler metal B) Using stabilized stainless steels C) Using higher carbon steel base and filler metal D) Completing a solution head treatment after welding What is the primary reason to produce a small percentage of ferrite when welding austenitic stainless steel? A) To avoid weld metal solidification cracking B) To improve the low temperature properties C) To improve the high temperature properties To reduce the likelihood of sensitization, which type of stainless steel was specifically developed to resist stress corrosion cracking?