2-20.2-21.2-22.2-23.Which type of gear-type rotarypumps discharges the smoothestfluid flow?1.Spur2.Helical3.Herringbone4.CrescentWhy are helical gear pumpsclassified as external gearpumps?1.Both sets of teeth projectinward toward the center ofthe gears2.Both sets of teeth projectoutward from the center ofthe gears3.The teeth of the interiorgear project inward towardthe center of the gears, andthe teeth of the exteriorgear project outward from thecenter of the gears4.The teeth of the interiorgear project outward from thecenter of the gears, and theteeth of the exterior gearproject inward toward thecenter of the gearsRefer to figure 4-2, view B, inyour textbook,What determinesthe volume delivery of this pump?1.The size of the crescent2.The size of the internal gear3.The speed of rotation of thecrescent4.The speed of rotation of thedrive gearRefer to figure 4-7 In yourtextbook.The vanes of the lobepump are used for which of thefollowing purposes?1.To reduce wear of the pumpcaused by surface to surfacecontact2.To provide a good sealbetween the lobes and thepoint of lobe junction in thecenter of the pump3.To provide a good sealbetween the lobes and thechamber4.To do both 2 and 3 above2-24.2-25.The pump illustrated In figure4.9 of your textbook isdesignated as unbalanced becausethe pumping action is done by oneside of the shaft and rotor.1.True2.FalseWhich, if any, of the followingstatements is true of a screwpump ?1.Its performance is based onthe fluid’ s viscosity2.It is very efficient3.The idler rotors areconnected by gears4.None of the aboveLearning Objective:Recognizefunctions,principles ofoperation,and constructionfeatures of various types ofreciprocating pumps.REFER TO FIGURE 4-10 IN YOUR,TEXTBOOK INANSWERING QUESTIONS 2-26 AND 2-27.2-26.This type of pump is used in someaircraft hydraulic systems toprovide a source of hydraulicpower for what purpose(s)?1.Emergencies2.Testing certain subsystemsduring preventive maintenance3.Determining the causes ofmalfunctions in certainsubsystems4.All of the above11
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