扬州大学英语高级课程2期末考试
第一部分：单选题
1. The starting current of 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 pha.
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.
汽车保险费A. distribution boards B. ction 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. t 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 怎么面对面建群
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C. be turned at least one complete turn D. be turned at least two complete turns
9. Shore power must be during dock repair.黄豆芽的生长过程>打扫卫生日记
A. disconnected B. switched off C. cut off D. connected
10. The switchboards systems differ from 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 .
A. A.C. B. D.C. C. generator D. fresh water generator
12. The parate supplies are connected in either star or delta formation. The star formation is most commonly ud 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. offt B. error C. deviation D. t 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. switchboard is usually the board becau 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 clod loop control system B. an open loop control system
吃什么能补大脑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?
石油干洗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
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21. A circuit breaker and a fu have a basic similarity in that they both .
A. can be ret to energize the circuit B. should open the circuit when overloaded
