轮机英语多媒体课件33

第三章

船舶电气与船舶安全A. the same as B. much larger than

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。

C. less than

D. equals

1887 Ammeter is to measure the ______安培表用来测量电流。 A. current B. voltage C. power D. frequency

1888In a modem three-phase A.C. synchronous brushes generator, 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 brushes 1889 The over current relay ______ the 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

1890The ______ is a measure of the phase difference between voltage and current 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相位差，表达成相位角的余弦。

A. power

B. efficiency

C. effective power

D. power factor

1891 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 generator

1892 The operation of paralleling two alternators requires the voltages to be ______ and also in phase. 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. equal

1893 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 phase

1894 The star-delta starter 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

1895 With a ______ load the voltage and current are in phase. 对于纯电阻负荷，电压和电流同相。 A. purely resistance B. capacitive C. inductive D. None of the above

1896 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 true. C. keep D. None of the above is

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. flowmeter B. viscometer C. micrometer D. feeler 1898 " gauge pressure " means ______ “表压”即是“超过大气压的压力”。 A.vacuum B. "the excess of pressure above atmosphere" D. Any of the above

C. "figure on a gauge"

189

9 A manometer is used to measure _____压气计用来测量压力。 A. pressure B. temperature C. volume D. specific gravity

1900 The viscosity regulator controls 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 C

1901A viscosity regulator used for an engine is usually provided in order to for an ______ engine 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 density

1902 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. the engine crankcase C. drain tanks B. the engine scavenge boxes D. fuel tanks

1903 UMS stands for ______ UMS代表“无人机舱’’。 A. ultra much space C. unit machined space B. universal medium system D. unattended machinery space

1904 The main generators are connected to ______主发电机与主配电板相连。 A. distribution boards B. section boards C. emergency switch boards D. main switch boards 1901 B 1902 A 1903 D 1904 D

1905 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 C. emergency switch boards B. section boards D. main switch boards

1906 Switchboards may be of the dead-front type in which all live parts are installed behind

______ 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 surface

1907 Remote control means that _____遥控，意即“系统位于远离操作者处”。 A. the system is manned manually B. the system is situated remotely from the operator C. the system is controlled automatically D. all the above

1908 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. burdon tube D. piezoelectric pressure transducer 1909 handle and instruments are on the front.题干表达有误。可参考第1906题。 B. open front type 1906 C 1907 B C. live front type D. None of the above

A. open 1905 C

1908 D 1909 B

1910 With UMS, when the engine room is unwatched …… 此处隐藏：14245字，全部文档内容请下载后查看。喜欢就下载吧 ……