【正文】 ersity 0653 Under maneuvering condition the main engine may run on_____. A. gas oil B. (marine diesel oil) C. residue oil D. crude oil原油 *0654 Uniflow is the most efficient scavenging system but requires_____ an opposed piston arrangement_____ an exhaust valve in the cylinder head. A. neither/nor B. both/and C. either/or D. not only/but also Jimei University 0655 . means_____. A. variable injection timing B. variable inlet tonnage C. vertical ining tonnage D. vertical inlet tank 0656 Valve gear knocks are more easily located while the engine_____. A. is running B. stops C. is repaired D. lacks of oil Jimei University 0657 Valve overlap is the period during which_____. A. the inlet valve is open B. the exhaust valve is open C. both valves are closed D. both valves are open 0658 Veetype engines have the connecting rods from two cylinders connected to each_____ of the crankshaft. A. throw B. web C. main bearing D. deflection Jimei University *0659 Vents are led from the engine to_____ for the release of air from the cooling water. A. the cooling jackets B. the head tank C. the cooling water pump D. the scavenging box Jimei University 0660 Vents are led from the engine to head tank_____ from the cooling water. A. for the release of air B. for the release of water C. in order to the release of air D. because the release of air Jimei University 0661 Vents are led from the engine to the head tank for the release of_____ from the cooling water. A. air B. heat C. sludge D. steam 0662 We call a ship equipped with a diesel engine as main engine_____. A. a tug boat拖船 B. a salvage ship 打撈船 C. an oil tanker D. a motor vessel內(nèi)燃機(jī)船 Jimei University *0663 We can control the speed of the engine by_____ the quantity of oil supplied. A. exchanging B. regulating調(diào)節(jié) （ 油量和速度 ） C. adjusting 校準(zhǔn) , 調(diào)整 （ 表 ） D. differing from 0664 We should not start the engine unless the turning gear is_____. A. on B. disengaged C. bolted D. unscrewed Jimei University *0665 Wear in a cylinder liner is usually due to_____. A. friction B. abrasion磨損 C. corrosion D. all of the above *0666 Wear in parts of exhaust valve operation gear will tend to_____ the tappet clearance. A. increase B. reduce C. rise D. reduction Jimei University 0667 We39。s speed B. the engine39。s_____. A. inlet valves B. exhaust valves C. emergency valves安全閥 D. runreturn valves 0609 The term_____ refers to one plete sequence of operations required to produce power in an engine. A. diesel engine B. stroke C. cycle D. pression ratio Jimei University 0610 The term medium speed diesel engine is currently taken to mean an engine with an operating rotational speed of_____ rpm. A. below 300 B. above 1200 C. between 300 to 1200 D. below 1200 0611 The thrust block_____ the thrust from the propeller to the hull of the ship. A. conducts B. fits C. transfers D. carries Jimei University *0612 The thrust block or thrust bearing, located at the_____ of the engine, may be integral with, or separated from, the bedplate. A. fore end B. aft end C. ahead D. astern end 0613 The thrust loading is carried by pads. In some designs the pads extend_____ of the distance around the collar. A. one quarter B. a half C. three quarters D. four fifths Jimei University 0614 The timing for each starting valve must be set so that it opens when the piston is_____. A. just past the TDC B. stopping C. close to BDC D. on the way upwards *0615 The timing of the injection can be altered by raising or lowering the pump_____ in relation to the cam. A. needle valve B. cylinder C. piston D. plunger Jimei University 0616 The transmission system is made up of shafts, bearings, and finally the_____. A. thrust shaft B. propeller C. reduction gear box D. train transmission 0617 The turboblower prises a gas turbine and a_____. A. condenser B. blower C. soot blower D. air receiver Jimei University *0618 The two halves of connecting rod large end bearing are held together by_____. A. bridges B. tap bolts螺基 , (帶頭 )螺栓 C. jack bolts定位 [起升 , 調(diào)整 ]螺栓 D. shims Jimei University *0619 The twostroke cycle begins with the piston_____, with the air inlet ports or scavenge ports in the sides of the cylinder being opened. A. ing down from the B. D. C B. ing up from the B. D. C C. ing down from the T. D. C D. ing up from the T. D. C Jimei University 0620 The twostroke cycle begins with the piston ing up from the bottom of its stroke, with _____ in the sides of the cylinder being opened. A. scavenge ports B. inlet valves C. air starting valves D. exhaust valves 0621 The twostroke cycle begins with the piston ing up from the bottom of its stroke, with scavenge ports in the sides of the cylinder being_____. A. shut B. closing C. opened D. closed Jimei University 0622 The twostroke cycle begins with the piston_____, with the air inlet ports or scavenge ports in the sides of the cylinder being opened.