【正文】 D. The generator has brushes 1889 The over current relay繼電器 _____ the motor contactor電流接觸器 when the motor exceeds its rated current . A. connects B. trips C. fouls D. destructs 1890 The_____ is a measure of the phase difference between voltage and current and is expected as the cosine of phase angle. A. power B. efficiency C. effective power D. power factor 1891 Current changing in direction and rising and falling in value is_____. . . C. generator D. fresh water generator 1892 The operation of paralleling two alternators requires the voltages to be_____ and also in phase. A. zero B. eliminated C. different D. equal 1893 The_____, cage rotor induction motor is the first choice marine motor in most modern ships because of its electrical and mechanical simplicity. A. single phase B. two phase C. three phase D. four phase 1894 The stardelta starter is an effective method of_____ voltage starting of a motor. A. increased B. reduced C. unchanged D. None of the above 1895 With a_____ load the voltage and current are in phase. A. pure resistance B. capacitive C. inductive D. None of the above 1896 Increasing the temperature of a fuel will_____ its viscosity. 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 pipeline within any given period of time. A. flow meter B. viseter C. micrometer D. feeler 1898 gauge pressure means_____. A. vacuum B. the excess of pressure above atmosphere C. figure on a gauge D. Any of the above 1899 A manometer is used to measure_____. 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 bustion. A. in order that B. because of C. in order to D. owing to 1901 A viscosity regulator used for an engine is usually provided in order to_____ for an engine burning heavy fuel oil . 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 _____. A. the engine crankcase B. the engine scavenge boxes C. drain tanks D. fuel tanks 1903 UMS stands for_____. A. ultra much space B. universal medium system C. unit machined space D. unattended machinery space 1904 The main generators are connected to_____. A. distribution boards B. section boards C. emergency switch boards D. main switch boards 1905 The emergency generator or emergency battery is connected to_____ on most large ships. A. distribution boards B. section boards C. emergency switch boards D. main switch boards 1906 Switchboards may be of the deadfront type in which all live parts are installed behind_____ and only the operation handles and instruments are on the front. A. the capstan B. the collector C. the panels D. the surface 1907 Remote control means that_____. 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. A. alternator B. glass thermometer C. bourdon tube D. piezoelectric pressure transducer 1909 _____ handle and instruments are on the A. open B. open front type C. live front type D. None of the above 1910 With UMS, when the engine room is unwatched_____ will control the main engine. A. the bridge officer on watch B. the chief engineer C. the duty engineer D. the duty motorman 1911 The difference between measured and desired values is called_____. A. makeup B. desired value C. deviation D. set value 1912 _____ systems are provided with a standby device which will automatically be put in use in the even of the running device failing through a fault condition. A. Alarm B. Monitoring C. Auto startup D. None of the above 1913 The operating medium for control systems may be_____. A. pressed air B. hydraulic oil C. electricity D. All of the above 1914 _____ power is the power developed within the cylinder and can be measured by an engine indicator. 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 output. A. Feed back B. Negative feed back C. Close loop D. Open loop 1916 Prior to any overhaul work on electric equipment, it is important to ensure the circuits are_____. A. live B. dead C. excited D. on line 1917 Moisture in a . motor would cause_____. A. short circuit B. speed up C. slow down D. hunting 1918 On monly used ships, if two . generators are operated in parallel, the load is distributed evenly by_____.