1 大学英语期末考试（A） 第一部分：单选题 1. The starting current of an a.c. motor is_____ the rated current. A. the same as B. much larger than C. less than D. equals 2. With a_____ load the voltage and current are in phase. A. pure resistance B. capacitive C. inductive D. None of the above 3. 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 4. 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. A. the capstan B. the collector C. the panels D. the surface 5. 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 6. The difference between measured and desired values is called_____. A. make-up B. desired value C. deviation D. set value 7. 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 8. Before starting an engine by air ,the engine must _________ A. be turned by a turning gear for at least one minute B. be turned by a turning gear for at least two minutes C. be turned at least one complete turn D. be turned at least two complete turns 9. Shore power must be_____ during dock repair. A. disconnected B. switched off C. cut off D. connected 10. 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 common rule. A. permissibly B. permissible C. no permissible D. not permissible 11. Current changing in direction and rising and falling in value is_____. 2

A. A.C. B. D.C. C. generator D. fresh water generator 12. The separate supplies are connected in either star or delta formation. The star formation is most commonly used and requires_____ slip-rings on the alternator. A. two B. three C. four D. five 13. The difference between measured and desired values is called A. offset B. error C. deviation D. set value 14. After the trouble of the automatic control system has been completely eliminated, assistance is_____ required. A. remained B. still C. no longer D. much mere 15. The field coils_____ and the armature is_____. This is in fact the arrangement adopted for large, heavy duty alternators. A. stationary/rotate B. stationary/stationary C. rotate/stationary D. rotate/rotate 16. An a.c. switchboard is usually_____ the corresponding d.c. board because of the higher voltage and lower currents and smaller bus-bars. A. larger and heavier than B. as much as C. smaller and lighter than D. more dangerous than 17. In_____ the control action is independent on(of) the output. A. a closed loop control system B. an open loop control system C. a boiler control system D. a steering gear control system 18. It_____ for an emergency generator to require paralleling. A. is usual B. is not usual C. is necessary D. is not impossible 19. Which of the motors for the devices listed below is fitted with an instantaneous overload relay? A. Fan B. Pump C. Winch D. Machine tool 20. An electrical device which prevents an action from occurring until all other required conditions are met is called a/an_____. A. limit B. monitor C. modulator D. interlock 21. A circuit breaker and a fuse have a basic similarity in that they both_____. A. can be reset to energize the circuit B. should open the circuit when overloaded C. will burn out when an over current flow develops D. All of the above 3

22. A constant output voltage from an AC generator is maintained by the_____. A. prime mover governorB. exciter generator C. voltage regulator D. reverse power relay 23. What will be the phase angle relationship of a six-pole, three-phase, rotating field generator _____. A. 60 B. 120 C. 180 D. 360 24. Copper is often used as an electrical conductor because it_____. A. has high resistance at low temperatures B. has a highly polished surface C. is able to pass current with little opposition D. holds insulation together well 25. In a series circuit, which value will remain unchanged at all places in the circuit? A. Voltage B. Current C. Resistance D. Inductance 26. The total resistance of a parallel circuit is always_____. A. larger than the greatest branch resistance B. smaller than the lowest branch resistance C. equal to the sum of the individual branch resistances D. one-half the sum of the individual branch resistances 27. _____ means the Government of the State whose flag the ship is entitled to fly. A. Assembly B. Organization C. Company D. Administration 28. The part of the shipboard electrical system used to control the distribution of power to the branch circuits, is the_____. A. bridge control panel B. disconnect links C. governor relay boxD. main switchboard 29. The port state control inspection is carried out on the basis of the following international conventions. Among them, which one was not set by IMO? A. LL66 B. ITC69 C. ILO No. 147 D. SOLAS 74r 30. Possible phase relationships between voltage and current in an alternating current circuit include which of the following conditions? A. Current and voltage may be in phase. B. Current may lead the voltage. C. Current may lag the voltage. D. All of the above. 31. An ammeter should be used to measure_____. A. the voltage between two points in a circuit B. circuit continuity C. current flow in a circuit D. total or partial circuit resistance