3-51. Which of the following is often the most likely cause of a filter hydraulic control system failing to operate properly? 1. Manually operated valves improperly aligned 2. The tubing has obstructions or is dented 3. The automatic valves are improperly installed 4. Too much water in the fuel 3-52. During centrifugal purifier operations, where will the solid contaminants be collected after they are separated from the fuel? 1. In the heavy phase outlet 2. On the underside of the disks 3. On the outer edge of the disks 4. On the inside bowl wall 3-53. What part of the purifier acts as a pump? 1. The tubular shaft 2. The paring disk 3. The intermediate disks 4. The distribution holes in the intermediate disks 3-54. What are the ideal operating pressures of the centrifugal purifier? 1. 9 psi inlet and 25 psi outlet 2. 9 psi inlet and 30 psi outlet 3. 9 psi inlet and 35 psi outlet 4. 30 psi inlet and 9 psi outlet 3-55. When the purifier bowl has to be cleaned, which components allow the cover assembly to be rotated open without disconnecting the piping? 1. The cover hinge, inlet, and outlet assembly 2. The feed tube assembly and cover hinge 3. The feed tube assembly and ratchet hook 4. The cover hinge and ratchet hook 3-56. During purifier operations, impure JP-5 is directed into the bowl and purified JP-5 is directed out of the bowl by what force or component? 1. The seal water inlet valve 2. Centrifugal force 3. The feed tube assembly 4. The regulating tube 3-57. What part of the purifier is the shaft for the paring disk? 1. Regulating tube 2. Feed tube 3. Tubular shaft 4. Drive shaft 3-58. The feed tube screws into what device? 1. The feed tube assembly 2. The outlet tube 3. The paring disk 4. The tubular shaft 3-59. What device(s) prevent(s) the purifier from rotating during disassembly and assembly? 1. Spring-loaded handle 2. Three handwheel cover clamps 3. Lock screws 4. Ratchet hook catch 3-60. What component acts as a shock absorber to absorb vertical thrust of the spindle shaft when the purifier is started? 1. Horizontal spring 2. Vertical spring 3. Horizontal ball bearing 4. Vertical ball bearing 3-61. A total of how many sets of ball bearings support the spindle assembly? 1. Five 2. Two 3. Three 4. Seven 21