[Nov 21, 2022] 100% Real & Accurate API-571 Questions with Free and Fast Updates [Q129-Q149]

NO.129 Cracks that are typically straight, non-branching, and devoid of any associated plastic deformation are likely associated with which type of failure?

NO.130 __________ is a form of cracking that results when certain molten metals come in contact with specific alloys. Cracking can be very sudden and brittle in nature.

NO.131 Geometry, stress level, number of cycles and _________ are the predominate factors in determining the fatigue resistance of a component.

NO.132 Amine cracking is a form of ________ stress corrosion cracking.

NO.133 With thermal fatigue, time to failure is a function of the magnitude of the stress and the number of cycles and decreases with _________ stress and ________ cycles.

NO.134 Wet H(2)S services or _________ acid services are process where hydrogen diffuses into the steel and hydrogen embrittlement (HE) is an issue.

NO.135 A form of fatigue cracking in which cracks develop under the combined effects of cyclic loading and corrosion is called _______. Cracking often initiates at stress concentrations such as a pit in the surface.

NO.136 Soil to Air interface areas are usually more susceptible to corrosion than the rest of the structure because of ___________ and __________ availability.

NO.137 Short term overheating is a permanent deformation occurring at relatively _________ stress levels as a result of localized overheating. This usually results in bulging and failure by stress rupture.

NO.138 What method is most used to assure boiler feed water corrosion is not occurring?

NO.139 Sulfidation of iron-based alloys usually begins at metal temperatures above _____.

NO.140 ____________ are characterized by a localized loss in thickness in the form of pits, grooves, gullies, waves, rounded holes and valleys. These losses often exhibit a directional pattern.

NO.141 Permanent deformation occurring at relatively low stress levels as a result of localized overheating is called ________.

NO.142 Creep damage is found in high temperature equipment operating above the ________. Fired heater tubes and components, Catalytic reactors, FCC reactors and FCC fractionator and regenerator internals all operate in or near this.

NO.143 Which material does not have an endurance limit?

NO.144 Which of the following is not a method used to prevent brittle fracture?

NO.145 Stress relief and stabilization heat treatment of 300 Series SS for maximizing chloride SCC and PASCC resistance can cause ____________ problems, especially in thicker sections.

NO.146 _________ is surface initiated cracks caused by environmental cracking of 300 Series SS and some nickel based alloys under the combined action of tensile stress, temperature and an aqueous chloride environment. The presence of dissolved oxygen increases the propensity for cracking.

NO.147 A form of mechanical fatigue in which cracks are produced as a result of dynamic loadings is _______.

NO.148 _________ is the sudden rapid fracture under stress (residual or applied) where the material exhibits little or no evidence of ductility or plastic deformation.

NO.149 The sudden rapid fracture under stress (residual or applied) where the material exhibits little or no evidence of ductility or plastic deformation is called _________.