Weak current College】 【the air conditioning with cooling technology law questions and answers reference 14 --- Power By】 【China power house network.

<br> 1, the current domestic screw compressor rotor gear ratio of yin and Yang to (B). <br> (А) 4:6 (В) 6:4 (C) 5:6 (D) 6:5 < .br> 2. refrigeration compressor used lubricating oil its flash point higher than the discharge temperature (C) 0C. <br> (A) 60 ~ 70 (B) 30 ~ 40 (C) 25 ~ 35 (D) 160 ~ 171 < .br> 3. compressor oil pressure differential controller JC-3.5, accepts two pressure signals a crankcase pressure, another is (A) <br> (A) oil pump discharge pressure (B) compressor pressure <br> (C) oil pressure ( .D) inspiratory pressure <br> 5, the figure is lgp_h (B) as abscissa. <br> (A) pressure (B) temperature enthalpy (C) (D) none of the above <br> 6, apply to water deficit .zone of condenser type is (A) the condenser. <br> (A) (B) for evaporative water-cooled (C) natural air cooling type <br> (D) mandatory air-cooled <br> 7, depending on the .liquid mirror main role is to check the refrigerant (). <br> (A) flow (B) (C) the degree of oily water level (D) the degree of impurity <br> 8, solenoid valve in the refrigeration system should .be installed in (B). <br> (A) evaporators and compressors (B) storage dispenser and expansion valve <br> (C) freezers and storage solution (D) oil separator and condenser <br> 9. using bipolar compression refrigeration .cycle is due to (D) <br> (A) refrigeration (B) condensing temperature too high <br> (C) in the form of different compressor structure (D) the compression ratio is too large <br> 10, evaporation pressure .control valve under (D) direct and lead the valve and the main valve combination. <br> (A) evaporator area size (B) the capacity of expansion valve <br> (C) a refrigerated area size (D) evaporation pressure control .valve size <br> 11, cooling tower of the cooling effect, commonly used two indicators is (B) <br> (A) of the cooling water temperature and the temperature difference (B) completely cooling water temperature and cooling high <br> .(C) cooling water wet-bulb temperature and cooling water temperature difference (D cooling water dew point temperature and cooling high <br> 12, security means that (A) <br> (A) personal security and device security (B) high .pressure gas safety and equipment safety <br> (C) personal security and safety of pressure equipment (D) electrical safety and the safety of pressure vessels <br> 14, shell and tube condenser belongs to (D) heat exchanger. <br> .(A) air cooling (B) hybrid (C) regenerative (D) wall <br> 15, R22 refrigerant compressors are more used in refrigeration oil is (D) <br> (A) N15 (B) N22 (C) N32 .(D) N46 <br> 16, freon in moisture content should be controlled at (D) below. <br> (A) 2.5% (B) 0.25% (C) 0.025% (D) 0.0025% <br> 17, .for there is no atmospheric ozone layer destruction of refrigerants is (C). <br> (A) R12 (B) R22 (C) R717 (D) R502 <br> 18, steam compression refrigeration system, when the condensation temperature, ( .B) to increase <br> (A) refrigeration capacity (B) compressor power <br> (C) the volume of suction quality (D) the amount of refrigerant cycle <br> 19, at the start the freon compressor before on lubricating .oil heating purposes is (C) <br> (A) improving lubricant temperature (B) reducing lubricant viscosity <br> (C) make the lubricating oil into the escape of freon (D) to prevent freezing of lubricating oil <br> 20 ., screw compressors work process is characterized by (C). <br> (A) low rotational speed, stable running (B) operate high rotational speed, vibration <br> (C) work process continuous, pulse phenomenon (D) there are .clearance, low volume efficiency <br> 21, in use in the refrigeration compressor pump more is (C). <br> (A) external gear pump (B) Crescent-gear pump <br> (C) internal gear pump (D .) none of the above <br> 22, when the condenser inside or outside the temperature reached (C). C above, the fusible plug melting, release the refrigerant. <br> (A) 50 (B) 60 (C) 70 .(D) 80 <br> 23, large air conditioning engineering or low-temperature refrigeration engineering should be used (D) compressor. <br> (A) piston (B) screw type (C) Volution type (D) centrifugal <br .> 24, the pressure oil control of energy regulation agencies have energy control valve, (B), uninstall the cylinder jacket, etc. <br> (A) hydraulic pump (B) oil pipeline (C) top open bodies (D) valve .<br> 25, medium and low pressure steel pressure vessel test of gas pressure, the lower the pressure PT to (C). <br> (A) 1.00P (B) 1.05P (C) 1.15P (D) 1.25P .<br> 26 the freon leakage would cause large numbers of people unconscious gas concentration is (D). <br> (A) 5% (B) 10% (C) 15% (D) 20% <br> 27 acetylene gas .in high temperature or (C) than atmospheric pressure. There is a risk of spontaneous combustion and explosion. <br> (A) 1.0 (B) 1.5 (C) 2.0 (D) 2.5 <br> 28 the use of cutting tube cutting .copper tube, (C). <br> (A) to make one week cut (B) as far as possible, so that the cutting wheel cutting stammers deep <br> (C) General rotation II circle feed once (D) General .rotation around a feed <br> 29, central air conditioning and refrigeration systems with normal boot order is (). <br> (A) cooling water pump drive → open → cooling tower water pump (delay 1min) → chiller opened <br> .(B) Tower open → open → cooling water pump cold water pump (delay 1min) → chiller opened <br> (C) cooling water pump (delay 1min) → open → cooling tower water pump drive → chiller opened <br> (D .) cold waterPump (delay 1min) → open → cooling water pump cooling fan open → chiller opened <br> 30, high-temperature refrigeration system library only one compressor, in his system at the pipeline should be installed (A) <br> ( .A) evaporation pressure control valve (B) condensing pressure control valve <br> (C) condensing temperature regulating valve (D) temperature-liquid level control valve <br> 32. General new refrigeration system the first refrigerant charge to design values of ( .B), and then in the system at any time while debugging. <br> (B) 50% (B) 60% (C) 70% (D) 80% <br> 34, refrigeration systems, piping should be based on .the nature of painting, in which ammonia system liquid pipe (C) <br> (A) blue (B) red (C) yellow (D) Green <br> 35 in the condenser reservoir fluid, high-voltage equipment, when the .pressure of safety valve (A) reached Mpa, should be able to automatically turn on. <br> (A) 1.8 (B) 1.5 (C) 2.0 (D) 1.6 <br> 36. to implement the prevention primarily, anti- .in conjunction with the "approach, refrigeration room should be equipped with CO2 or" dry "or (A) fire-fighting equipment in case of fire, electrical fire fire and refrigerant. <br> (A) 1211 (halides) (B) .water (C) sand (D) above are 37, under normal circumstances, the cumulative run compressor (C) about ongoing maintenance. <br> (A) one year (B) (C) 2500h 6000h (D) 700h <br> .38, (D) is not a screw compressor temperature is too high. <br> (A) the compression ratio is too large (B) oil cooler effect difference <br> (C) fuel injection quantity is insufficient (D) energy- .regulating device failure <br> 39, lithium bromide solution PH value should be adjusted to (C) in the range of normal. <br> (A) (B) the following 7.5 7.5 ~ 9.5 <br> (C) 9.5 ~ 10.5 .(D) above 10.5 <br> 40, when the room temperature and the temperature difference is large, frequency conversion air conditioner Converter output frequency of up to (D) HZ. <br> (A) 30 (B) 60 (C) .90 (D) 120 <br> 41, screw chillers operating compressor shows rise in oil level should be taken (C) measures to troubleshoot. <br> (A) (B) downtime for check oil pressure adjustment (C) increase the oil .temperature (D) check the oil pump <br> 42, screw compressor widespread adoption of energy regulation system in the form of (D) <br> (A) change the rotor speed (B) on the suction throttling <br> (C .) change back to the suction Chamber (D) slide valve regulation <br> 43, in LIBR absorption chiller, water is the refrigerant, lithium bromide is (C) <br> (A) desiccant (B) coolant (C) absorption agent .(D) desiccant <br> 44, lithium bromide refrigeration equipment cooling capacity adjustment, (D) to maintain the cold water outlet temperature constant. <br> (A) Regulation the evaporation temperatures (B) condensing temperature adjustment <br> (C .) and cold water temperature adjustment (D) cooling capacity adjustment <br> 45, LIBR absorption chiller outage (C) <br> (A) first gateway solution pumps (B) the first refrigerant pump (C) to close the steam valve ( .D) take off power <br>.