7- Crevice corrosion may occur at the following locations except A- Washers B- Under barnacles and sand grains C- Flat surfaces D- Under applied protective films, and at pockets formed by threaded joints. 8- There are two basic mechanisms of crevice corrosion A- Oxygen concentration cell corrosion and Chlorine concentration cell corrosion B- Metal ion concentration cell corrosion and pH cell corrosion C- Oxygen concentration cell corrosion and Metal ion concentration cell corrosion. 9- The potential for crevice corrosion can be reduced by A- Avoiding sharp corners and designing out stagnant areas B- Use of sealants C- Use welds instead of bolts or rivets D- Selection of resistant materials. E- All of the above. 10- The extent of accelerated corrosion resulting from galvanic coupling is affected by the following factors except: A- The potential difference between the metals or alloys B- The decrease in temperature C- The polarization behavior of the coupled materials D- Spatial effects, such as area, distance, and cell geometry E- Resistivity of the electrolyte. 11- Galvanic corrosion can be controlled in several ways, including the following ways except: A- Design B- Materials Selection C- Anodic Protection D- Electrical Isolation E- Barrier Coatings. 12- Which form of corrosion can occur very rapidly and result in a failure before inspection can identify damage? A- Environmental cracking B- Erosion Corrosion C- Uniform Corrosion D- High Temperature Corrosion.