三管轮轮机英语试题 泵.doc

1079. _____ at the end of the distribution pipe ensures that adequate pressure is maintained by the pump. A. A relief valve B. An alarm C. A pressure gauge D. A non-maim valve 1080. In general, _____ is suitable for delivering small quantities at high pressure. A. reciprocating pump B. gear pump C. centrifugal pump D. vane pump 1081. The pumps employed on board ship can be divided into two main categories i.e. _____ pumps and centrifugal pumps. A. gear B. nonpositive displacement C. positive displacement D. rotary 1082. Lube oil pumps taking suction from the sump of most small marine engines are usually _____. A. of the diaphragm type B. of the centrifugal type C. of the positive displacement type D. independently driven by electric motors 1083. The lube oil pump used in a diesel engine is a_____. A. volute pump B. centrifugal pump C. diaphragm pump D. gear pump 1084. Which of the following conditions could cause the feed pump for an auxiliary boiler to lose suction? A. Increased suction head pressure. B. Decreased feedwater temperature. C. Pump recirculating line being open too much. D. Excessive feedwater temperature. 1085. A vane pump belongs to_____ according to its working principle. A. reciprocating pump B. positive displacement pump C. centrifugal pump D. centripetal pump 1086. Through a_____ pump, the liquid is transferred from the suction to the discharge by the mechanical variation of the volume of a chamber or chambers. A. positive displacement B. ejector C. centrifugal D. air compressor 1087. A mono-pump is a single-screw pump. That means it consists of_____ rotor(s). A. one B. two C. three D. four 1088. The gear and screw pumps are classified as_____. A. variable stroke pumps B. multistage pumps C. positive displacement pumps D. triple-ported pumps 1089. Gear pumps are of positive displacement type pumps because they discharge a near constant am