4A Unit 7 Questions and Answers Already Passed

4A Unit 7 Questions and Answers Already Passed The most efficient insulators are: Select one: a. substances with air gaps b. substances with microscopic air pockets c. substances with reflective surfaces d. substances with multiple membranes b Low pressure steam pipes are usually connected together by: Select one: a. Welding, glands or screwed b. Welding, screwed or flanged c. Screwed, flanged or glands d. Welded, screwed, flanged or glands b Improper drainage of steam lines could: Select one: a. result in excessive steam pressures b. cause low pressure in the lines c. eventually result in water hammer d. give excessive weight to the pipe c The Van Stone type flange fits on the pipe: Select one: a. in a fixed position b. by being welded onto the inside circumference of the flange c. by being threaded on the ends d. loosely d Pipe hangers are installed at three metre intervals to: Select one: a. align the pipe, keep the pipe out of the way of foot traffic b. provide a proper drainage slope, align the pipe, allow free movement for pipe expansion c. provide a proper drainage slope, prevent leaks d. keep the pipe out of the way of foot traffic b By using backing rings in butt welded pipes, the backing ring serves to: Select one: a. reinforce the pipe because of beveling at the joint b. reduce sludge flow c. align the pipe d. support the pipe to the wall c All markings on pipes and pipe fittings must indicate the following three minimum requirements: Select one: a. Material, inside diameter and national colour code b. Inside diameter, flange type, service designation c. Inside diameter, flange type and national colour code d. manufacturer's trademark, service & material designations d Gray cast iron fittings are identified by: Select one: