船舶电气与船舶安全.ppt

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1、 第三章第三章 船舶电气与船舶安全船舶电气与船舶安全1886 The staring current of an a.c.motor is _the rated current.交流电机的启动电流比额定电流大得多。A.the same as B.much larger than C.less than D.equals1887 Ammeter is to measure the _安培表用来测量电流。A.current B.voltage C.power D.frequency1888In a modem three-phase A.C.synchronous brushes generato

2、r,the excitation winding is on the rotor.That means _对于现代三相交流同步有刷的发电机，励磁线圈在转子上。意即转子上的线圈用于输入励磁电流。A.The generator need not excitation B.The winding on the rotor is for inputting excitation current C.There are three phase windings on the rotor D.The generator has brushes1889 The over current relay _ th

3、e motor contactor when the motor exceeds its rated current.当电动机超过额定电流时，过电流继电器将跳开。A.connects B.trips C.fouls D.destructs 1886 B 1887 A 1888 B 1889 B 2021/9/1511890The _ is a measure of the phase difference between voltage and current 1891 and is expected as the cosine of phase angle.功率因数可用来表示电压与电流之间的

4、相位差，表达成相位角的余弦。A.power B.efficiency C.effective power D.power factor1891 Current changing in direction and rising and falling in value is _ 方向、大小都变化的电流是交流电。A.A.C.B.D.C.C.generator D.fresh water generator1892 The operation of paralleling two alternators requires the voltages to be _ and also in phase.

5、两台交流发电机并联，需要电压相等，并且同相。A.zero B.eliminated C.different D.equal1893 The _,cage rotor induction motor is the first choice marine motor in most modem ships because of its electrical and mechanical simplicity.现代船舶上使用的电机都是三相电机。A.single phase B.two phase C.three phase D.four phase1894 The star-delta starte

6、r is an effective method of _ voltage starting of a motor.采用Y启动器是电饥低电压启动的最好方法。A.increased B.reduced C.unchanged D.None of the above 1890 D 1891 A 1892 D 1893 C 1894 B 2021/9/1521895With a _ load the voltage and current are in phase.1896对于纯电阻负荷，电压和电流同相。1897A.purely resistance B.capacitive C.inductive

7、 D.None of the above1896 Increasing the temperature of a fuel will _ its viscosity.提高燃油的温度将降低其粘度。A.increase B.reduce C.keep D.None of the above is true.1897 The _ is used to measure the volume of a liquid or gas through a pipelin within any given period of time.流量计用于测量在给定时间内，通过管子的液体或气体的体积。A.flowmete

8、r B.viscometer C.micrometer D.feeler1898 gauge pressure means _“表压”即是“超过大气压的压力”。A.vacuum B.the excess of pressure above atmosphere C.figure on a gauge D.Any of the above1899 A manometer is used to measure _压气计用来测量压力。A.pressure B.temperature C.volume D.specific gravity1900 The viscosity regulator con

9、trols the fuel oil temperature_ provide oil at the correct viscosity for combustion.粘度调节器通过控制燃汕的温度实现粘度的控制。A.in order that B.because of C.in order to D.owing to 1895 A 1896 B 1897 A 1898 B 1899 A 1900 C2021/9/1531901A viscosity regulator used for an engine is usually provided in order to for an _ eng

10、ine burning heavy fuel oil.柴油机的粘度调节器能保持燃油粘度恒定。A.regulate the fuel supply B.maintain a constant fuel viscosity at the fuel valves C.maintain efficient cooling D.alter the fuel density1902 Oil mist detectors are usually used on board to detect oil mist density within _大型低速柴油机上的油雾检测器用于检测曲柄箱内滑油蒸汽的存在。A.t

11、he engine crankcase B.the engine scavenge boxes C.drain tanks D.fuel tanks1903 UMS stands for _ UMS代表“无人机舱。A.ultra much space B.universal medium system C.unit machined space D.unattended machinery space1904 The main generators are connected to _主发电机与主配电板相连。A.distribution boards B.section boards C.em

12、ergency switch boards D.main switch boards 1901 B 1902 A 1903 D 1904 D2021/9/1541905 The emergency generator or emergency battery is connected to _ on most large ships.应急发电机或应急蓄电池与应急配电板相连。A.distribution boards B.section boards C.emergency switch boards D.main switch boards1906Switchboards may be of

13、the dead-front type in which all live parts are installed behind1907 _ and only the operation handles and instruments are on the front在表面不带电式的配电板中，带电部件安装在面板的后面，只有操作手柄和仪表在 前面。A.the capstan B.the collector C.the panels D.the surface1907 Remote control means that _遥控，意即“系统位于远离操作者处”。A.the system is mann

14、ed manually B.the system is situated remotely from the operator C.the system is controlled automatically D.all the above1908 The _ is a crystal which,under pressure,produces an electric current which varies with the pressure.压电式传感器是一种晶体，在压力下能产生电流，电流大小随压力变化而变化。A.alternator B.glass thermometer C.burdo

15、n tube D.piezoelectric pressure transducer1909 handle and instruments are on the front.题干表达有误。可参考第1906题。A.open B.open front type C.live front type D.None of the above 1905 C 1906 C 1907 B 1908 D 1909 B2021/9/1551910 With UMS,when the engine room is unwatched_will control the main engine.对于无人机舱，由值班驾驶

16、员来控制主机。A.the bridge officer on watch B.the chief engineer C.the duty engineer D.the duty motorman1911 The difference between measured and desired values is called_ 测量值和所需要值之间的差，称为“偏差”。A.make-up B.desired value C.deviation D.set value1912systems are provided with a stand-by device which will automati

17、cally be _ 1913 put in use in the even of the running device failing through a fault condition.备用设备装有自动启动系统，当运转设备故障时，便能自动投人使用。A.Mann B.Monitoring C.Auto start-up D.None of the above1913The operating medium for control systems may be _ 1914 控制系统的操作介质可以是压缩空气、液压油或电力。1915 A.compressed air B.hydraulic oi

18、l C.electricity D.All of the above 1914 _ power is the power developed within the cylinder and can be measmed by an engine indicator.指示功是气缸内发出的功率；可通过示功图来测量。A.The shaft B.The mechanical C.The electric D.The indicated 1915 _ control system is one in which the control action is independent of the out-p

19、ut.控制作用与输出量无关，这种控制系统是开环控制。A.Feed back B.Negative feed back C.Close loop D.Open loop 1910 A 1911 C 1912 C 1913 D 1914 D 1915 D2021/9/1561916Prior to any overhaul work on electric equipment,it is important to ensure the circuits 1917 are _对电气设备检修前，应确保电路切断。A.live B.dead C.excited D.on line 1917 Moistur

20、e in a D.C.motor would cause _水分会引起直流电机短路。A.short circuit B.speed up C.slow down D.hunting 1918 On commonly used ships,if two A.C.generators are operated in parallel,the load is distributed evenly by _两台交流发电机并联运行时，负荷可以通过调节原动机的转速的方法来实现。正确答案应为 A.varying the D.C.exciter voltage B.varying the reluctance

21、 of the air gap C.regulating the speed of prime mover D.shorting out part of the armature windings 1919 Electric insulation is made of organic substances and so gradually _ with age.电器绝缘材料是由有机物质组成，随着时间的推移，性能会逐渐恶化。A.deteriorates B.increases C.are fouled D.becomes better 1920 Electric insulation is ma

22、de of organic substances and so gradually _ with age.见上题。A.deteriorates B.increases C.are fouled D.becomes better 1916 B 1917 A 1918 D 1919 A 1920 A2021/9/157 1921 The system will include various _ such as low tank level alarms and remote operation of tank outlet valves in the events of a fire.油舱低位报

23、警和速闭阀等都属于安全设备。A.Switches B.panels C.alarm units D.safety devices 1922 is used to produce electric power._交流发电机用来产生交流电。A.An alternator B.fresh water generator C.A compressor D.A clarifer 1923 The coil of wire rotating in the magnetic field produces the _ 在磁场中旋转的线圈能产生电流。A.voltage B.current C.power D.f

24、requency1924 Shore power must be _ during dock repair.坞修期间，必须接岸电。A.disconnected B.switched off C.cut off D.connected1925The current flowing first in one direction and then in another is called 1926 _ current.方向改变的电流是交流电。A.an alternating B.a rush C.a direct D.an exciting 1921 D 1922 A 1923 B 1924 D 1

25、925 A 2021/9/1581926 Electrical supply is always needed even if only for lighting so after a ship goes into service it is extremely rare for the main bus-bars to be dead,it therefore follows that the bus-bars are continuously alive _ the life of the ship.船舶的主母线在整个船舶使用期内都是持续有电的。A.along B.will C.throu

26、ghout D.for1927 The switchboards for a.c.systems differ from the d.c.switch gear in that the open type panels are generally _ and the dead-front switch gear is the comnn rule.用作交流系统的配电板与用作直流系统的配电板不同之处在于一般不允许使用开式面板，而常用表面不带电式。A.permissibly B.permissible C.no permissible D.not permissible1928 You must

27、take good care of the drainage cock of the air control system.Because _ leads scale formed which might malfunctions the pilot control valve and other instruments.必须仔细保养空气控制系统的放残考克。因为水分会引起水垢形成，从而使得控制阀和其他仪表产生故障。A.the temperature B.the mst C.the pressure D.the humidity1929 The liquid flowing in the cap

28、illary is such that the difference in _ readings taken before the capillary and after it is related to the oil viscosity.对于在毛细管内流动的液体，毛细管前后的压差读数与油的粘度有关。A.pressure B.velocity C.flow rate D.temperature1930 _ shall be continuously powered and shall have an automatic changeover to a stand by power suppl

29、y in case of loss of normal power supply.报警系统应持续供电。A.Cooling system B.Alarm system C.The air conditioning installation D.The mooting equipment 1926 C 1927 D 1928 D 1929 A 1930 B2021/9/1591931 _ is a machine by which electrical energy is transformed into mechanical energy.将电能转化为机械能的是电动机。A.An alternat

30、or B.An electric motor C.A diesel engine D.A main switchboard 1932 Current changing in direction and rising and falling in value is _见第1891题。A.A.C.B.D.C .C.generator D.fresh water generator 1933 Switchkx)ards may be of the dead-front type in which all live parts are installed behind _ and only the o

31、peration handles and instruments are on the front见第1906题。A.the capstan B.the collector C.the panels D.the brake1934 After a ship enters service it is _ for the main bus-bar to be made dead.船舶投人使用后，主母线不带电是极其少见的。A.usually B.commonly C.exceptional D.unavoidably1935The separate supplies are connected in

32、 either star or delta formation.The star formation is most commonly used and requires _ slip-rings on the 1936 alternator.Y形连接需要4个滑环。A.two B.three C.four D.five1937 1931 B 1932 A 1933 C 1934 C 1935 C 2021/9/15101936 The operation of paralleling two altermators requires the voltages to be and _ also

33、in phase.见第1892题。A.zero B.eliminated C.different D.equal1937With a purely _ load the voltage and current are in phase,giving a power1938 factor of one.见第1895题。A.inductive B.resistance C.combined D.capacitate1938 The operation of _ two altermators requires the voltages to be equal and also in phase.见

34、第1892题。A.paralleling B.series-mounting C.running D.control1939 Which of the following marine examples belongs to the open loop control system?只有舱室的加热系统可以采用开环控制。A.Accommodation heating system B.Steering gear C.Boiler control D.Cargo control1940 is the actual value of the controlled condition._ 测量值就是控

35、制条件的实际值。A.Desired value B.Set value C.Measured value D.Deviation 1936 D 1937 B 1938 A 1939 A 1940 C2021/9/15111941 The difference between measured and desired values is called _ 见第1911题。A.offset B.error C.deviation D.set value1942 The overcurent relay _ the motor contactor when the motor exceeds its

36、 rated current.见第1889题。A.connects B.trips C.fouls D.destructs1943 Electric insulation is made of organic substances and so gradually _ with age.见第1919题。A.deteriorates B.increases C.are fouled D.are contaminated1944The _ is a crystal which,under pressure,produces an electric current which varies with

37、 the pressure.见第1908题。1945 A.alternator B.glass thermometer C.bunion tube1946 D.piezoelectric pressure transducer19471945 Domestic water pump is started automatically by _ which operates as the water level falls to a predetermined level.日用水泵是由压力开关自动启动的。A.a level controller B.a temperature switch1948

38、 C.a floating ball D.a pressure switch1949 1941 C 1942 B 1943 A 1944 D 1945 D2021/9/15121946After the trouble of the automatic control system has been completely 1947 eliminated,assistance is _ required.自动控制系统的故障已彻底排除，不再需要任何帮 A.remained B.still C.no longer D.much more1947 With UMS,when the engine ro

39、om is unwatched _ will control the main engine.见第1910题。A.the bridge officer on watch B.the chief engineer C.the duty engineer D.the duty motorman1948 The staring current of a motor is _ the rated current.见第1886题。A.the same as B.much larger than C.less than D.none of the above1949 The alternating cur

40、rent generator supplying a load has a voltage drop resulted from the load.When the load has a lagging power factor this voltage drop _由于负荷的特性，交流发电机会产生电压降，当负荷具有滞后的功率因数时该电压下降是很大的。A.is small B.may be neglected C.is useful D.is considerable1950 With a purely resistance load the voltage and current are i

41、n phase,giving a power factor of _对于纯电阻的负荷，电压与电流同彻，功率因数为1 A.one B.less than one C.more than one D.negative one 1946 C 1947 A 1948 B 1949 D 1950 A2021/9/15131951The power factor is a measure of the phase difference between voltage and 1952 current and is expressed as the _ of the phase angle.见第1890题

42、A.sine B.cosine C.tangent D.cotangent 1952 The field coils _ and the armature is _.Ibis is in fact the arrangement adopted for large,heavy duty alternators.常用大型交流发电机的结构，线圈是旋转的而电枢是静止的。A.stationary/rotate B.stationary/stationary C.rotate/stationary D.rotate/rotate1953The star formation is most commonl

43、y used and requires _ on the alternator.1954见第1935题。A.one slip-ring B.two sliprings C.three sliprings D.four sliprings1954 An a.c.switchboard is usually _ the corresponding d.c.board because of the higher voltage and lower currents and smaller bus-bars.交流配电板比相应的直流配电板尺寸小、重量轻。A.larger and heavier than

44、 B.as much as C.smaller and lighter than D.more dangerous than1955 The magnetic field is provided by electromagnets so reranged that adjacent poles have _磁场有电磁铁提供，其布置应使相邻的极具有相反的极性 A.opposite polarity B.the same polarity C.negative polarity D.positive polarity 1951 B 1952 C 1953 D 1954 C 1955 A 2021/

45、9/15141956To parallel an incoming machine to a running machine therefore it is necessary to ensure firstly that 1957 _见第1892题。A.two frequencies must be brought into phase B.the incoming machine accepts a small amount of load C.the running machine must be unload D.both voltages are equal 1957 is prov

46、ided to alternators,in the event of prime mover failure to ensure that _ the alternator does not act as a motor.交流发电机装备逆功率保护设备，是为了防止当发电原动机故障时，刁能当作马达使用。A.Reverse current protection B.Reverse power protection C.Synchronising device D.Frequency meter 958 With a purely _ load the voltage and current are

47、 in phase,giving a power fac-tor of one.见第1950题。A.inductive B.capacitive C.combined D.resistance 1959 When two different metals are joined to form a closed circuit and exposed to different temperatures at their junctions _ which can be used to measure temtmture.当两种不同的金属连接形成封闭回路，连接处与不同的温度接触，将会产生电流据 此

48、可用来测量温度。此为热电偶的工作原理A.a current will flow B.a power will develop C.a heat will flow D.a pressure will produce 1960 Movement of the diaphragm or bellows is _ by a linkage to a needle or pointer display to indicate the differential pressure between two sides of the diaphragm or bellows.膜片或波纹管的移动通过连接装置传递

49、到指针。以显示膜片或波纹管两侧的压差A.measured B.recorded C.transferred D.controlled 1956 D 1957 B 1958 D 1959 A 1960 C2021/9/15151961Bourdon Tube is probably the most commonly used_ measuring instrument.波登管是最常用的表压力测量仪表。A.the absolute pressure B.the gauge pressure C.the vacuum pressure D.the differential pressure1962

50、 This arrangement is _ if the elements are directly connected to one another and the control action takes place without human involvement.一步如果控制回路中，部件与部件之间直接相连，控制作用不需要人员的介入就能完成这种控制形式就是自动闭环控制。A.a manual closed loop B.a manual opened loop C.an automatic closed loop D.an automatic opened loop1963 In_ t