轮机英语三管轮试题 空调.doc

轮机英语1530. Keep compartment_ as the gas given off can be dangerous.A. well ventilated B. well clean C. in good order D. more room1531. The cooler as the liquid becomes, _.A. the faster it will evaporate B. the slower it will condenseC. the slower it will evaporate D. the faster it will flow1532. The heat used to change a liquid to a vapor is called_.A. latent heat of fusion B. latent heat of vaporizationC. specific heat of vaporization D. latent heat of the gas1533. The temperature _ a liquid changes its state from liquid to gas dependsupon the liquid itself and upon the pressure _ it is subjected in the containingvessel.A. at which/to which B. from which/at which C. to which/from which D. in which/on which1534. Air conditioning is the process of treating air to control _ its temperature,humidity, cleanliness and distribution to meet the comfort requirements of theoccupants of the conditioned space.A. instantaneous B. instantaneously C. simultaneous D. simultaneously1535. One of the functions of ventilation is to_ the humidity of spacescontaining sources of moisture, or to_ the temperature of spaces notmechanically cooled such as the engine room.A. increase/reduce B. reduce/increase C. increase/increase D. reduce/reduce1536. _ is the control of temperature and humidity in a space together with thecirculation, filtering and refreshing of the air.A. Refrigeration B. Air conditioning C. Ventilation D. Heating1537. _ is the circulation and refreshing of the air in a space without necessarilya change of temperature.A. Refrigeration B. Air conditioning C. Ventilation D. Heating1538. _ is used for sensing the temperature of the room in the air condition system.A. An expansion valve B. An evaporator C. A thermostat D. A condenser1539. Water evaporates or steam condenses at the saturation temperature, whichdepends upon the pressure, the higher the pressure _ the saturation temperature.A. the more B. the higher C. the lower D. the highest1540. The shutter of the evaporator was blocked with_, it means there was too much evaporation.A. ice B. wooden board C. iron plate D. cotton waste1541. The quantity of cooled air delivered by an air conditioning unit should_the sum of the quantity of air re-circulated to the unit and the quantity mechanicallyexhausted.A. balance B. not balance C. be more than D. be less than1542. In the process of_, liquid changes into gas.A. evaporation B. frosting C. condensing D. compressing1543. In extreme weather conditions, either hot or cold, control of the airconditioning plant presents_ difficulties.A. few B. little C. a little D. less1544. Most air conditioning units have_ for adjusting the ratio of recirculatedfresh air. Care must be taken not to reduce the fresh air so that stuffiness or smellsarise.A. catch plates B. dampers C. regulating valves D. fans1545. For the intermediate condition, thermostats must be correctly set _.A. by trial and error B. by and large C. automatically D. very easily1546. The process of removing moisture from air is known as _.A. humidification B. dehumidification C. vaporization D. evaporation1547. If air at 95oC dry bulb temperature and 50% relative humidity is conditionedto 75oC dry bulb temperature and 50% relative humidity, it is an example of _.A. cooling only B. cooling and humidifying C. cooling and dehumidifying D. adiabatic cooling1548. Increasing the moisture content of conditioned air is known as_.A. moisturizing B. dehumidification C. dampening D. humidification1549. The sum of the sensible heat and the latent heat of any substance is known as_.A. total heat B. residual heat C. specific heat D. superheat1550. The heat identified by only a change in temperature is known as_.A. sensible heat B. latent heat C. total heat D. residual heat1551. In reference to air conditioning, when air attains the maximum amount ofmoisture it can hold at a specific temperature, it is said to be_.A. superheated B. saturated C. condensed D. convected1552. Which of the following factors will have the greatest effect on the heating loadwithin a conditioned space?A. Solar gain. B. Infiltration and ventilation air.C. Occupants inside the space. D. Entertainment equipment within the space.1553. The dew point of air is reached when the wet bulb temperature is_.A. Twice the dry bulb temperature B. 10oC above the dry bulb temperatureC. 5oC above the dry bulb temperature D. Equal to the dry bulb temperature1554. The temperature at which water vapor in the atmosphere begins to condense iscalled the_.A. dew point temperature B. condensation temperatureC. psychometric temperature D. absolute humidity temperature1555. The heat required to change a substance from a solid to a liquid while at itsfreezingtemperature, is known as the latent heat of _.A. fusion B. vaporization C. condensation D. sublimation1556. The heat required to change a substance from a liquid to a gas withoutexperiencing a temperature change is defined as the latent heat of _.A. fusion B. vaporization C. sublimation D. condensation1557. The amount of moisture in a given sample of air, when compared with theamount of moisture the air could hold if totally saturated at the existing temperatureof the sample, is called _.A. absolute humidity B. specific humidity C. effective humidity D. relative humidity1558. The ratio of the weight of moisture contained in a given volume of air, to theweight of moisture that the same sample would hold if saturated, is called the_.A. absolute humidity B. relative humidity C. specific humidity D. total humidity1559. The sensible heat of air is dependent upon the _.A. dry bulb temperature B. wet bulb temperature C. saturation temperature D. water vapor superheat1560. Sludge may form in the crankcase of an air conditioning compressor as a result of _.A. bubbling refrigerant B. overheating and oxidationC. lowered operating temperatures D. reducing the cloud or flash point1561. Due to the large amount of heat picked up by the air in boiler and enginerooms, it would be _ to maintain ambient conditions within the comfort zone byair conditioning .A. possible B. necessary C. practicable D. impracticable1562. The process of adding moisture to air to increase the relative humidity is known as _.A. sublimation B. humidification C. desiccation D. moisturization1563. The main distribution duct in an air conditioning system which contains the cooling coils and filters is called the _.A. manifold B. condenser C. chamber D. plenum1564. The humidity of the atmosphere can be determined by the use of the _.A. anemometer B. Manometer C. potentiometer D. psychrometer1565. Which of the following functions is not one of the functions of air conditioner?A. refreshing the air B. making person upset C. adjusting the air humidity D. adjusting the air temperature1566. When comparing the air with 50%of relative humidity with air with 100% ofrelative humidity, which one will hold more water?A the former B the latter C not for sure D same each other 1567. For the proper control of the air temperature in an air conditioning usingchilled water circulation, which of the listed conditions should remain constantregardless of load changes?A. Chilled water system supply temperature B. Chilled water system return temperatureC. Compressor discharge temperature D. Compressor suction pressure 1568. The _only allows for adjustment of temperature in each room by theoccupant manually controlling the air volume admitted.A. central air conditioning system B. high velocity system C. low velocity system D. single duct system1569. With ducted air conditioning systems, the modern tendency is to use _A. central air conditioning system B. high velocity system C. low velocity system D. single duct system1570. Which one is not the component of a typical marine pattern self-contained unit?A. a water cooler condenser B. a direct expansion cooler C. a hermetic compressor D. a centrifugal pump 1571. _ is used in typical marine pattern self-contained unit.A. a water cooler condenser B. a slop tank C. a expansion tank D. a centrifugal pump1572. Under normal conditions, the quantity of air circulation becomes less and less.What is the reason?A. dirty delivery ducts B. too much refrigerant C. the fouling filters D. high temperature outside1573. Under tropical conditions, control valves have fully opened, but the room stillhot. What measures can be taken in such a case.A. Keep the plant running all time B. Stare another blowerC. Increase the ratio circulated to fresh air D. Reduce the seawater flow to the condenser1574. If a film insulation becomes damaged in air conditioning system, _ mayfrom within the film.A. evaporation B. condensation C. liquefies D. vaporization1575. The humidifiers valve of air-conditioner should be _, when the temperatureis 58 in the winter.A. decreased B. increased C. fixed D. closed1576.The humidifiers valve of air-conditioner should be _, when thetemperature is lower than 0o C.A. decreased B. increased C. fixed D. closed1577. The air-conditioner is running in the winter and to be stopped, we should _.A. close Fan and Humidifier at the same time. B. firstly close Fan and then close humidifier immediately.C. firstly close humidifier and then close Fan immediately.D. firstly close humidifier and then close Fan after 30 seconds.1578. When starting air-conditioner in the winter, we should open _ in sequence. I. valve of warming . valve of humidifier . FanA. 、 B. 、 C. 、 D.、1579. When air is at its dew point it is at its _.A. lowest absolute humidity B. lowest relative humidityC. highest absolute humidity D. highest relative humidity1580. Which of the fluids listed is normally used to condense the primary refrigerant in a shipboard central air conditioning system?A. air or nitrogen B. seawater or fresh water C. sodium nitrate brine D. calcium sulfate brine 1581. A re-heater, as used in an air conditioning system, is designed to control the _.A. chilled water temperature B. dew point temperature C. primary air temperature D. dry bulb temperature1582. To prevent the unnecessary loading of an air conditioning system while maintaining the designed dry bulb temperature and relative humidity in an air conditioning system, you should _.A. admit only enough fresh outside air to provide proper ventilation B. reduce the air reheating system loadC. lower the compressor heat pressure D. operate the purge recovery unit continuously1583. A lower thermostatic temperature setting will provide a desired degree of comfort in a room where _.A. low relative humidity is maintained B. triple banded squirrel cage fans are used C. air circulation is a maximum D. high relative humidity is maintained1584. In an air conditioning system, moisture is removed from the air by _.A. filters B. separators C. ducted traps D. dehumidifiers1585. Routine maintenance on a Central Control Room hermetically sealed air conditioning unit should include _.A. changing the air filter B. recharging the system C. changing compressor lubricant D. renewing container vacuum 1586. In order to achieve greater dehumidification with an air conditioning system, you should _.reduce the cooling coil; temperature increase the re-heater temperatureA.only B.only C. bothand D. neithernor1587. Which of the processes listed would be the most satisfactory method to use to lower the humidity of the air being circulated by an air conditioning system?A. Cooling the air to a temperature just above dew p