轮机英语三管轮英语试题 制冷Word格式.docx

1、A. release B. absorb C. develop D. regenerate1294. A fluid coil will _ large quantifies of heat when it changes state froma vapor to a liquid.1295. The latent heat of evaporation is dissipated in the _ in a compressionrefrigeration system.A. evaporator B. condenser C. expansion valve D. compressor12

2、96. A refrigerant boils and vaporizes in the _ in a compression refrigeration system.A. liquid receiver B. compressor C. condenser D. cooling coil1297. A refrigerant gives up heat when it goes through _.A. condenser B. regurgitate C. evaporator D. boil coil1298. It should be ensured that only _ vapo

3、r is handled by the refrigeration compressor.A. humidity B. dry C. steam D. oill299. In the refrigeration compressor the temperature of the vapor is _ by compression.A. raised B. risen C. reduced D. maintained constant1300. If the capacity of the refrigeration compressor is too small, the excessvapo

4、r will accumulate in the evaporator, causing the pressure to _.A.rise B. fall C. be maintained constant D. None of the above is true.1301. If the capacity of the refrigeration compressor is too large, the saturationtemperature will_.A. rise B. fall C. be maintained constant D. None of the above.1302

5、. In the process of_, liquid changes into gas.A. evaporation B. frosting C. condensing D. compressing1303. Since heat will not flow freely from a body at a_ temperature toanother at a_ temperature, it is necessary to expend mechanical work, heat,or electrical energy from an external source to achiev

6、e refrigeration.A. lower/higher B. shallower/deeper C. larger/smaller D. higher/lower1304. In a compression refrigeration plant the refrigerant flows from theexpansion valve and through the_ where it absorbs heat from the spacebeing cooled and becomes a gas or vapor.A. compressor B. condenser C. thr

7、ottle valve D. evaporator1305. The_ compressor and its electrical motor are entirely housed in a gas-tight casing.A. open-type B. hermetic C. A and B D. None of the above.1306. Both the temperature and the pressure of the refrigerant are increased in the _.A. compressor B. condenser C. evaporator D.

8、 expansion valve1307. The compressor suction line conveys the refrigerant vapor from_ to_.A. condenser/evaporator B. evaporator/compressorC. compressor/condenser D. None of the above.1308. The thermal expansion valve controls the amount of refrigerant that isallowed to flow to the_.A. compressor B.

9、cooling coils C. condenser D. receiver1309. When the temperature of the refrigerant flowing out from the condenser isbelow the condensing temperature, it is said to be_.A. dry B. wet C. super-cooled D. superheated1340. During working, thermostatic expansion valve should be_.A. either all the way ope

10、n or all the way closed B. normally fully openC. throttled depending on load D. controlled by liquefied pressure1341. The expansion valve on a Freon system controls the_.A. superheat of the gas leaving the compressor B. back pressure in the evaporatorC. temperature of the icebox D. superheat of the

11、gas leaving the evaporator1342. A feeler or thermal bulb is used for the expansion valve to_.A. detect the temperature B. detect the pressureC. heat the refrigerant D. accelerate the refrigerant1343. In a compression refrigeration plant the refrigerant is under low pressurein the_ and under high pre

12、ssure in the_.A. compressor/condenser B. condenser/evaporatorC. throttle valve/evaporator D. evaporator/condenser1344. The boiling and condensation points of refrigerant mainly depend onthe_ exerted upon it.A. temperature B. density C. volume D. pressure1345. The function of_ in a refrigeration plan

13、t using Freon is to movemoisture from all refrigeration system.A. filter B. filter drier C. heat exchanger D. air cooler1346. The saturation temperature of the refrigerant must be_ that requiredin the evaporator refrigerated space.A. above B. below C. equal to D. None of the above.1347. After passin

14、g through the expansion valve the refrigerant should be in the state of_.A. vapor B. liquid C. solid D. None of the above is tree.1348. The refrigerant flows through the evaporator, where it_ heat from therefrigerated space.A. extracts B. releases C. gives no D. absorbs no1349. In practice, the refr

15、igerant flow after the evaporator is designed to ensurethat the vapor leaving the evaporator is slightly_.A. saturated B. super-cooled C. wet D. superheated1350. Which of the following will be desirable properties of refrigerant?（1）non-explosive; （2）non-corrosive; （3）that it doesnt react with lubric

16、antsA. （1）, （2） and （3） B. （1） and （2） C. （1） and （3） D. （2） and （3）1351. In the _ refrigeration compressor one end of the crank shaft extendsthrough the crankcase house for connection, via a coupling or pulley, to anexternal drive motor.A. open-type B. hermetic C. semi-hermetic D. all the above1352

17、. In a compression refrigeration plant the hot, high pressure refrigerant gasis cooled by the sea water and becomes liquid in the_.1353. What is the function of thermostatic expansion valve in a compressionRefrigeration system?A. nonexistent B. for controlling pressureC. for controlling superheat D.

18、 for controlling the solenoid valve1354. In a vapor compression refrigeration the evaporating pressure ismaintained constant by the action of the_, which removes vapor from theevaporator at the same rate at which it is formed.A. evaporator B. compressor C. condenser D. none of the above1355. The dev

19、ice used for low-pressure control and high-pressure cutout on acompressor is called_.A. cutout B. controller switch C. pressure controller D. cutout switch1356. Which of the following may cause that the compressor cuts off on highPressure cutout in a refrigeration plant? （1） faulty condensing; （2） t

20、oo fewrefrigerant; （3） high discharge pressure;A. any of （1） and （3） B. any of （1） and （2） C. any of （2） and （3） D. any of （1）, （2） and （3）1357. Which of the following may cause that excessively warm water leaves thecondenser in a refrigeration plant? （1） too little cooling water; （2） too muchcoolin

21、g water; （3） too warm cooler water.A. （1） only B. any of （1）, （2） and （3） C. any of （1） and （3） D. any of （1） and （2）1358. The presence of air in the condenser of a refrigeration system will_the condensing pressure.A. increase B. reduce C. maintain constant D. None of the above is true.1359. Which o

22、f the following best describes overcharge of refrigerant?A. Too much refrigerant. B. Too little refrigerant. C. Refrigerant is ran out. D. Running is over.1360. What separate the high pressure side from the low pressure side in a refrigeration system?A. Condenser and thermal expansion valve. B. King

23、 and solenoid valves.C. Compressor and thermal expansion valve. D. Condenser and solenoid valve.1361. Moisture should be kept out of an R-12 system because it tends to cause_.A. icing of the automatic controls B. embitterment of some parts of the automatic controlsC. sludge in the lubricating oil D.

24、 all of the above1362. Air that may enter a refrigeration plant tends to collect in the_.A. upper part of the receiver B. upper part of the condenserC. down stream end of the cooling coil D. outlet end of the condenser1363. Insufficient refrigerant in a refrigeration plant may result in_.A. high dis

25、charge pressure B. frosting of the crankcaseC. high temperature of the overboard water D. low suction pressure of compressor1364. Which will cause the high pressure cutout to stop the compressor in a R-22 system?A. Condenser leakage B. A shortage of liquid refrigerantC. Excessive frost on the evapor

26、ator D. Not enough condenser cooling water1365. A ruptured diaphragm in a thermostatic expansion valve will cause the valve to_.A. open B. close C. remain in its position D. flood the evaporator with refrigerant1366. If liquid refrigerant accidentally comes in contact with the eyes, _ immediately.A.

27、 rub the eyes B. irritate the eyesC. wash the eyes with a heavy boric acid solution D. obtain medical help1367. Should a person be overcome due to lack of oxygen and highconcentration of refrigerant, treat with_.A. fresh water B. fresh air C. salt water D. artificial respiration1368. Excessively war

28、m water leaving condenser may be caused byA. fouled tubes in shell and tube condenser B. too little or too warm condenser waterC. air or non-condensable gas in system D. overcharge of refrigerant1369. The inner part of the condenser should be cleaned with_.A. gas oil B. diesel oil C. chemical compound D. Freon-121370. Freon 12 w