制冷試題b卷Refrigerationtestbcoil

1、制冷試題(b卷)（refrigeration test (b coil)）operation management system technology center equipment management departmentrefrigeration test (b coil)first, the multiple-choice question:1, the role of compressed oil is (a) sealing and silencing.a, lubricationb, cool downc, sound insulation2 、 refrigeration w

2、orkshop daily detection of ammonia leak, use (b) test paper or ammonia detection portable instrument. if the test paper is used, the operator shall have a clear understanding of how the test paper is to be used.a, phb, phenolphthaleinc, alcohol3, the main characteristic of frozen oil is (c).a, high

3、temperature without solidificationb, high temperature without vaporizationc, resistant to low temperature without solidification4, refrigerant vapor discharged by the compressor is called (a).a, superheated steamb, subcooled vaporc, saturated vapor5, the actual cycle of the compressor through four p

4、rocesses, they are (b).a suction, exhaust, expansion, compressionb suction, compression, exhaust, expansionc suction, expansion, exhaust, compression6, the transmission mechanism of the compressor refers to the piston, connecting rod, crankshaft and (a) and so on.a, couplingsb, motorc, air valve7 re

5、frigerant in the condenser is (c) state.a, supercoolingb, overheatingc, saturated8, refrigeration equipment, with the changes in heat load, the amount of liquid supply should bewith the increase of heat load, the amount of liquid supply increased (a).a, the heat load is reduced, and the liquid suppl

6、y is increasedb, heat load increased, the supply of liquid remained unchanged9, when hot ammonia defrost, the pressure before entering the evaporator shall not exceed (c).a, 3.0mpab, 1.8mpac, 0.8mpa10, refrigerant in use, and open flame distance is generally not less than (c).a, 1 metersb, 3 metersc

7、, 10 meters11. the refrigerant in the evaporator is endothermic and vaporized under (a).a, isothermal isobaricb, isothermal non isobaricc and isobaric non isothermal12. when the air conditioner is cooled, condensation water appears, at this time the evaporator(b).the process of increasing a and dryn

8、essthe process of reducing b and drynessthe process of constant drying of c14, compressed air, steam pressure (a), no oil and water, drying rate of 100%.a, 8 - 9b, 7 - 8c, 6 - 715, the evaporation temperature of a single-stage vapor compression refrigeration system can only reach (b) degrees.a, -30-

9、50b, -20-40c, -10-30d, -10-2016, under normal circumstances, condensers, evaporators and other heat exchangers running around (a) or so, should be overhauled.a, a yearb, 6000hc, 2500hd, 700h17, the reason for the instability of oil pressure is (c).a and lubricant deteriorationb, oil temperature is t

10、oo highc, oil pump with foam oild, too much lubricating oil18, when the cooling water temperature in the condenser decreases, the condensing pressure of refrigerant (a).a and decreaseb, increasec, unchangedd increases exponentially19, the ideal adiabatic compression process is a (d) compression proc

11、ess.a, isobaricb, isothermalc and iso enthalpy20, the vaporization of excess heat into the supercooled liquid is (c) to complete.a, refrigeration compressorb throttling devicec, condenserd, evaporator21, the vaporization of excess heat into the supercooled liquid is (c) to complete.a, refrigeration

12、compressorb throttling devicec, condenserd, evaporator22, the air (d) will lead to an increase of latent heat load of air conditioning.a, higher temperatureb and temperature increasec and pressure rised and specific volume decrease23, in the refrigeration system, expansion valve can be replaced by (

13、a).a, capillaryb, steel pipec, copper tube24, when the diameter and length of the capillary are determined, the amount of refrigeration system (b) will be strictly limited.a, airb, frozen oilc, moistured, refrigerant25, the insulation resistance of refrigeration equipment shall be no less than (b).a

14、, 0.1mb, 0.2mc, 5md, 2m26. the condensing pressure in ammonia refrigeration system should be less than (b).a, 3.5mpab, 1.5mpac, 2.0mpad, 1.0mpa27, refrigeration oil viscosity dropped to (b) should be replaced by new oil.a, 10%b, 15%c, 20%d, 18%28, the standard evaporation temperature (c) of ammonia.

15、a, -30.4 degrees cb, 40 cc, -33.4 degrees cd, c - 2829. the concentration of ammonia in the working area of the refrigeration workshop shall not exceed (d) per square meter.a, 100mgb, 50mgc, 30mgd, 20mg30, ammonia pump is not the main reason for the liquid after the start, due to ammonia pump (b).a,

16、 the ammonia storage valve is not openedb, ammonia filter, dirty blockc, compressor suction pressure is higher31. the setting pressure of the safety valve of refrigeration condenser is (c).a, 1.3mpab, 1.7mpac, 1.5mpa32, the thermodynamic aspects of the refrigerant requirements, the refrigerant requi

17、red boiling point (b).a, tallb, lowc, environmental temperature33, in the refrigerant circulation system of refrigerant requirements (c).a is always in low temperature at the working temperature rangeb, the energy consumption of refrigerant cycle operation to highc, refrigerant work to be safe and r

18、eliabled, the price is expensive34, the role of throttling mechanism in refrigeration system (a).a, high pressure liquid that makes condenser out, reduce pressureb makes liquid refrigerant gasified at low pressure and high temperature to absorb heatc, used to control the temperature of the refrigera

19、nt.35, the reason of the decrease of heat transfer performance of water cooling condenser is: (a).a, condensation tube deposited more than the scale or the skin is not cleanb, large water flow36. when ammonia is used as refrigerant, the water content in ammonia should not be higher than (b).a, 0.2%b

20、, 0.02%c, 2%d, 0.1%37. in pressure vessel classification, the pressure range of low pressure vessel is (a).a, 0.01 - 1.0mpab, 0.1 - 1.6mpac, 1.6 - 10mpa38, the opening of ammonia pump, (c) is wrong.a, such as after the accident stopped pumping, repair, you can startb, check whether the coupling rota

21、tion is flexiblec, turn off the ammonia pump valved, turn on the ammonia pump inlet valve39, in the stationary fluid, the pressure at the same point in the interior (d).a, scatterb, focusc, equald, unequal40, when the fluid flows through the pipeline, no local resistance will be lost (b).a, valvesb,

22、 straight pipec, bendd, reducing pipe41, cooling water cooling condenser refrigerant, condensing pressure (a).a and decreaseb, increasec, unchangedd, 042, determine the compressor exhaust factor for ().a and inspiratory temperatureb and exhaust temperaturec and gas transmission coefficientd, refrige

23、rant types43, in the low temperature at cold system, forced air-cooled evaporator must be set (a).a and defrosting deviceb, silencerc and humidifying device44, condensing temperature (b) of the compressor unit.a, not more than 30 degrees centigradeb, not more than 40 degrees centigradec, not more th

24、an 50 degrees centigraded, not more than 20 degrees centigrade45, "pn" in pneumatic valves on the meaning expressed as (b).a and the compressed air pressureb nominal pressurec, the pressure of the drive spring46, the heat transfer mode used in plate heat exchangers is (a).a, heat conductio

25、n and convection heat transferb and thermal radiationc convection heat transfer47 motor according to the type of power supply can be divided into (b).a, single-phase motor and three-phase motorb, dc motor and ac motorc, asynchronous motors and synchronous motors48, screw compressor can be divided in

26、to airframe, rotor, (b), shaft seal and coupling five parts.a, valvesb, slide valvec, motor49, the air compressor intake control valve discussed is correct (b).a, the intake control valve and solenoid valve, the minimum pressure valve combined role, used to control the compressor inlet switchb, the

27、intake control valve and solenoid valve, pressure sensor joint action, used to control the compressor inlet switchc, the intake control valve and the temperature control valve, the minimum pressure valve combined role, used to control the compressor inlet switchd, the intake control valve and the te

28、mperature control valve, pressure sensor joint action, used to control the compressor inlet switch50, using compression units to suppress the system (c).a, the exhaust pressure is not more than 1.57mpa, the exhaust temperature is not more than 150 degrees centigradeb, the exhaust pressure is not mor

29、e than 1.7mpa, the exhaust temperature is not more than 130 degrees centigradec, the exhaust pressure is not more than 1.8mpa, the exhaust temperature is not more than 100 degrees centigraded, the exhaust pressure is not more than 2.0mpa, the exhaust temperature is not more than 135 degrees centigra

30、de51, the superheated steam into supercooled liquid, by (c) to complete.a, refrigeratorb throttling devicec, condenserd, evaporator52, screw type refrigeration compressor shutdown, appear repeatedly reverse (b) is not closed.a, slide valveb and check valvec suction valved, exhaust valve53. the role

31、of the oil separator in the refrigeration system is (c).a, can be high-pressure, high temperature refrigerant vapor impurities, impurities, to prevent the system dirty plugb and reduce the exhaust temperature of compressorc, the high temperature, high pressure refrigerant vapor in the steam outd, a,

32、 b, and c54, screw refrigeration compressor oil ratio, exhaust pressure should be (a).a, high 0.15-0.3mpab, low 0.15-0.3mpac, high 0.3-0.45mpad, low 0.3-0.45mpa55, the safety valve pressure relief vent pipe, the height should be the tallest buildings higher than 50 meters around the room (c) meters.

33、a, 5b, 3c, 1d, 1056, the compressor coupling is divided into (a) and () two.a, pin type, diaphragm typeb, belt type, gear typec, chain type, gear typed, belt type, chain type5, 7 of the thermodynamic aspects of the refrigerant requirements, the refrigerant required boiling point (b).a, tallb, lowc,

34、environmental temperature58, the ammonia system should be opened slowly after the suction valve, the purpose is to prevent the compressor (b).a, high exhaust pressureb and liquid shockc, high suction pressured, low oil temperature 59, high pressure controller used in refrigeration system, mainly use

35、d (c).suction pressure protection in a and refrigeration compressorpressure protection of b, low temperature and high pressure refrigerantexhaust pressure protection of c and refrigeration compressorevaporation pressure protection of d and air condition60 、 the function of the unloading valve of the

36、 screw air compressor is (c).a, loadb and depressurizationc, regulation, loading and unloading61, refrigerant evaporation in the evaporator, refrigerant temperature (c).a, lowerb, elevatedc, no change62, screw compressor oil on each (c) oil mirror.a, 1b, 2c, 363, air compressor oil separator before

37、and after the pressure difference should not be higher than (a) mp.a, 0.4b, 0.3c, 0.264, the screw machine overhaul period is about (b).a, 1 yearsb, 3 yearsc, 6 months65 、 compressor pressure difference controller, accept two pressure signals, one is the pressure of the oil pump, and the other is (b

38、).a, oil pump discharge pressureb, compressor exhaust pressurec, hydraulic pressured and inspiratory pressure66, the compressor exhaust pressure shall not be higher than (b).a, 1.4mpab, 1.5mpac, 1.7mpad, 1.8mpa67. the consequence of lack of oil in the compressor of ammonia system is (c).a, holds the

39、 axle, the bayonet chamberb, shell rupturec, unit stop68, open the valve, in order to prevent the spool was blocked by the valve body, generally required to rotate the handwheel, do not force, should hand wheel rotation (b) weeks.a, 1/10b, 1/8c, 1/4d, 1/669. in the vapor compression refrigeration cy

40、cle, the phase transition modes are (d) and ().a, evaporation, boilingb, vaporization, coagulationc, liquefaction, boilingd, vaporization, liquefaction70. the oil storage capacity of the oil collector shall not exceed that of its capacity (b).a, 60%b, 70%c, 80%d, 90%71, throttle valve opening degree

41、 and unit refrigeration effect is not good, the reason is: (a).the distinction between a and high and low pressure zones is unknown. liquid can not be converted into steamb, large flow, resulting in high steam pressurec, high pressure causes cold heat than right72. the normal level of the intercoole

42、r is (b)%.a, 20b, 30c, 4073, screw machine head overhaul period is about (b).a, 1 yearsb, 2 yearsc, 6 months74, the horizontal direction of suction head should be slope (b).a compressorb, evaporatorc, level75, pump shaft water leakage volume (a) for taiyuan.a, seals damagedb and excessive water flow

43、c, poor water quality, scale and impurities.76, oil collector oil storage shall not exceed (c)%, the pressure should be higher than 0mpa, in case the air enters.a, 30b, 50c, 70d, 9077. what is the pressure difference between the front and rear oil filters in a refrigeration system (a)?.a, 0.15-0.3b,

44、 0.15-0.4c, 0.2-0.478, all the chlorine ion exchanger on the multi-channel valve must ensure normal operation, otherwise the exchanger is stopped, and the multi-channel valve working procedure is (d).a, salt washing, backwash, water productionb, washing, salt absorption, backwashing, water productio

45、nc, washing, backwashing, salt absorption, water productiond, backwashing, salt washing, washing, water production79, in the refrigeration unit,the basic way to clean the dirt inside the refrigeration system is (a).a and filterb, with detergentc and desiccantd, with stop valve80. the amount of heat

46、absorbed by the refrigerant per unit time (c) is called the unit mass refrigeration capacity.a and over coolerb, condenserc, evaporatord, refrigeration compressor81, in the refrigeration system, the role of electromagnetic valve (a.a and control refrigerant flowb, control the oil into the compressor

47、c, prevent liquid striked and control air quantity82, according to the low temperature that can be achieved by artificial refrigeration, refrigeration technology can be divided into four fields, of which the common refrigeration temperature range is (d).a, 0.3k belowb, 20 - 0.3kc, 120 - 20kd, 120k o

48、r more83 (d) is the terminal unit of the refrigeration self-service control system.a, controlled objectb, sensorsc, controllerd, executor84, ammonia system should be opened slowly after the suction valve, the purpose is to prevent the compressor (b).a, high exhaust pressureb and liquid shockc, high

49、suction pressured, low oil temperature85 the width of the main operating channel of the compressor in the computer room shall not be less than (d) meters.a, 0.8b, 1c, 1.2d, 1.586, hot ammonia water defrosting method is applicable to (b).a, refrigeration equipmentb, freezing and refrigerating equipme

50、ntc, air conditioning equipmentd, cryogenic equipment87. during the operation of the refrigeration compressor, the moving friction parts shall not exceed the room temperature (a) deg c.a, 30b, 40c, 45d, 20the type of refrigerant oil used in compressors 88 and 2960 rpm is (b).a, 30#b, 46#c, 13#d, 18#

51、89, balance piston withstand (a).a, axial forceb, radial forcec, pushingd and longitudinal forces90, when refueling the refrigerator, (c) violates the safe operating procedures.a, check the specifications and types of lubricating oilb, check whether the fuel pipe is cleanc, when refueling, the tubin

52、g leaks out of the liquid leveld and record refueling capacity91, ammonia leakage can be used () leak detection.a, a litmus testb, soapy waterc, salt waterd, sodium hydroxide92, throttle valve opening degree and unit refrigeration effect is not good, the reason is: (a).the distinction between a and

53、high and low pressure zones is unknown. liquid can not be converted into steam.b, large flow, resulting in high steam pressure.c, high pressure causes cold heat than right.93, the safety valve at least once a year to check (a), and seal.a, 1b, 2c, 3d, 494 、 air compressor mechanical system flow has

54、().a, air system, lubricating oil system, remote control system and drive systemb, lubricating system, transmission system, remote control system, filtering systemc, air system, lubricating system, cooling system, transmission systemd, lubricating system, transmission system, cooling system, remote control system95 、 compressor pressure difference controller, accept two pressure signals, one is the pressure of