CWB Module 16 questions & answers rated A+

CWB Module 16To ensure that calipers are accurate you would a) use a vernier b) calibrate them c) always take a reading to three decimal places - correct answer b) calibrate them 2. True or False? "Systematic errors can always be avoided by using a sufficiently precise measuring instrument." - correct answer False State one disadvantage of using a "go/no-go" type gauge for determining whether a product is within tolerance. - correct answer It does not give the actual measurement which could be useful in process control A high quality measuring instrument. . a) should not be calibrated unless something goes wrong b) should be calibrated by the operator every time it is used c) should be calibrated regularly as specified in a formal calibration program - correct answer c) should be calibrated regulary as specified in a formal calibration program True or False? "When reading a meter with a pointer always stand directly in front to avoid a parallax error." - correct answer True State one reason for measuring dimensions from a single reference line or datum - correct answer To avoid cumulative errors When making accurate measurements with a long steel tape it is important that the tape ... a) be held loose so it does not stretch b) be held under the correct tension applied with a tension handle c) be held as tight as possible so there is no slack - correct answer b) be held under the correct tension applied with a tension handle What are two ways of checking if a surface is vertical? - correct answer Use a plumb bob or a spirit level How would you check that a flange is at right angles to the web if a try square could not contact the flange because of the fillet weld? - correct answer Measure with a rule from the flange to the try square at two points. the two reading should be the same Describe a simple method for checking a square - correct answer Place the square against a straight edge of a plate, scribe a line , flip it over and check if the line is square True or False? "When using a string as a reference line to measure distortion in a plate always make the measurements horizontally from the string to the plate." - correct answer True What instrument(s) would you use for checking the angle of a weld preparation? - correct answer Bevel gauge and/or protractor According to CSA W59 what is the minimum distance from the weld at which to measure the preheat in plates 44mm thick? a) 75mm b) 44mm c) no minimum - correct answer a) 75mm A 'pipe' is a solidification cavity in steel. Where would you most likely find such a defect when inspecting a rolled plate? a) on the plate suriace b) in the middle of an end section c) large pores throughout the plate thickness - correct answer b) in the middle of an end section True or False? "According to CSA W59 occasional notches on a flame cut suriace may be removed by grinding or machining if less than 5mm deep". - correct answer True Give one reason why the size of a gap between parts to be fillet welded together is important. - correct answer If larger than certain size the fillet weld size must be increased by the amount of the gap For two 38mm thick plates to be groove welded without a backing bar what is the maximum misalignment permitted by CSA W59? - correct answer 3mm Why is the preparation of a partial joint preparation groove weld particularly important? - correct answer The depth of preparation determines the weld size Is the size of a fillet weld always the same as the measured leg le ngth? - correct answer No, The size is smaller than the measured leg length for a concave fillet If the leg lengths of a convex fillet weld are unequal which one determines the weld size? - correct answer The smaller of the legs What dimension is measured to determine the size of a concave fillet weld? - correct answer The throat What are two important dimensions when checking a complete penetration groove weld - correct answer Reinforcement and reduction in thickness True or False?