4-47. 4-48. 4-49. 4-50. 4-51. The distance from the top of one gear tooth to its bottom, including any clearance is known by what term? 4-52. On piping fittings such as crosses and elbows, what opening is read first? 1. Working  depth 2. Whole depth 3. Thickness 4. Rack teeth What symbol provide a foundation for surface  finish  information? 1. The smallest opening 2. The largest opening 3. The opposing opening 4. The outlet end 4-53. On a typical 45° Y-bend with the dimensions of 45cm x 30cm x 60cm, what is the measurement of the outlet end? 1. 2. 3. 4 . 1. 35cm 2. 30cm 3. 60cm 4. 75cm At what degree to the horizontal should you draw the legs of a finish mark? 4-54. A brown valve in your space on board ship indicates that the valve connects piping carrying what type of fluids? 1. 30 2. 90 3. 45 4. 60 When should you draw an isometric single- line  plumbing  diagram? 1. When details are essential 2. When speed is essential and pipes are bent in more than one plane 3. When the print will be used to install pipes 4. When visual appearance is important How should you show a permanent pipe connection? 1. Anesthetics 2. Flammable 3. Oxidizing 4. Toxic and poisonous 4-55. What additional hazard marking label should appear on piping with a brown valve? 1. FLAM 2. TOXIC 3. PHDAN 4. AAHM 4-56. Shipboard hydraulic lines carrying excess fluids overboard are known by what term? 1. With a crosshair and a note 1. Return lines 2. With a small vertical line 2. Operating  lines 3. With a heavy solid dot 3. Vent lines 4. With a open-faced square 4. Supply lines 26