Weak current College】 【the air conditioning with cooling technology law questions and answers reference 17 --- Power By】 【China power house network.

<br> 28, horizontal shell condenser coil inner flow is (). <br> (A) refrigerant (B) brine (C) cooling water (D) chilled water <br> 29, shell and tube dry R22 refrigerant evaporators use, .guaranteed to bring back (a), the compressor <br> (A) air (B) water vapour (C) dirt (D) lubricants <br> 30, cold drink water tank and cooler is a () evaporator. <br> .(A) (B) immersion air-cooled finned (C) dry-type (D) full-hydraulic <br> 31, 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> 32, solenoid valve in the refrigeration system should be installed in (). <br> (A) evaporators and compressors (B) storage dispenser .and expansion valve (C) the condenser and reservoir fluid (D) oil separator and condenser <br> 33, thermostatic expansion valve of energy should be () compressor cooling capacity. <br> (A) is greater than 120 per cent (B .) greater than 180% (C) is less than (D) equal to <br> 34, when inside temperature too high or too low, you can adjust the adjustment screw (). <br> (A) temperature difference (B) .temperature range (C) the temperature of defrosting (D) parking temperature <br> 35, () refrigerants in the same condition exhaust temperature Max. <br> (A) R12 (B) R22 (C) R717 (D) R502 < .br> 36, water-cooled condenser of scaling problems, clear () method. <br> (A) boiling water erosion (B) (C) of the torch is heated in hydrochloric acid solution (D) high pressure nitrogen flushing <br .> 37, pressure experiment of air is used (). <br> (A) (B) oxygen-nitrogen (C) air (D) water vapour <br> 38. in the diagram enthalpy-wet, etc. () on .a line parallel to the ordinate. <br> (A) temperature (B) pressure (C) moisture content (D) enthalpy <br> 39, heat and moisture ratio equal to (). <br> (A) the residual moisture .and heat than (B) waste heat and humidity ratio (C) waste heat and wet product (D) waste heat and wet and <br> 40, air conditioning system in the fresh air as a percentage of the total air should not be less .than (). <br> (A) 10% (B) 15% (C) 20% (D) 30% <br> 41, applied capacitor phase starting method of single phase motor has two windings, the two windings in space .location mutual difference () <br> (A) 90o (B) 0o (C) 180o (D) 45o <br> 42, water-cooled condenser and scaling issues, (C) method to clear. <br> (A) .boiling water erosion (B) (C) of the torch is heated in hydrochloric acid solution (D) high pressure nitrogen flushing <br> 43, pressure test of the source type (A) <br> (A) (B) oxygen- .nitrogen (C) air (D) water vapour <br> 44. in the diagram enthalpy-wet, and so on (C) a line parallel to the ordinate axis. <br> (A) temperature (B) pressure (C) .moisture content (D) enthalpy <br> 45, air-conditioning system air supply covers air percentage of less than (A) <br> (A) 10% (B) 15% (C) 20% (D) 30% < .br> 46, applied capacitor phase starts with single phase motor oil two windings, the two winding position in space (A) mutual difference. <br> (A) 90 (B) 0 (C) 180 (D) 45 <br> .47, using simple and automatic temperature control of small lithium fluoride Leon freezer EFI system (C) <br> (A) be in service management to consider no-voltage protection circuit (B) be in Service Management Department will set voltage failure protection circuit .<br> (B) must be set to voltage protection circuit (D) the prohibition set voltage failure protection circuit <br> 48, a small team of freon refrigerator compressor protection must have (B) <br> (A) undervoltage and overload .protection (B) overload and short circuit protection (C) low-voltage protection and RP protection (D) short circuit and reverse protection <br> 49,-moving coil temperature setting indicates that the regulation instrument, taking into account (B) < .br> (A) limit values and setting the lower limit value (B) set value and dynamic difference range values (C) set value and percentage values (D) limit values and protecting values <br> 50, AC contactor for rated operating voltage .and current is one whose primary contact of voltage and current, (B) it should be <br> (A) equal to the control circuit of the rated voltage and current ratings (B) equal to or greater than the rated voltage and current rating .(C) greater than the control circuit of the rated voltage and current rating more than doubled (D) greater than the control circuit of the rated voltage and more than two times the rated current <br> 51, the ability to accurately observe the refrigeration .system low pressure part of pressure gauges is (B) <br> (A) low pressure table (B) low pressure with pressure gauge (C) vacuum table (D) high pressure table <br> 52, using pipe Bender bending pipe, .copper tube bending radius should be less than the brass part (C) <br> (A) three times the radius of (B) five times the radius of (C) three times the diameter (D) five times the diameter of the < .br> 53, repair conditioner General Repair table (A) to consider <br> (A) with high and low pressure gauges (B) high and low pressure gauges (C) high pressure gauge diameter (D) low pressure gauge pressure range < .br> 54, practical fluid flow, its internal adjacent two-layer between (A) <br> (A) by the attractiveness of friction (B) (C) (D) repel each other forces driving force <br> 55, the .best use of copper pipe welding (B) <br> (A) welding (B) silver brazing (C) copper brazing (D) Tin brazing <br> 56, freon cooling system pressure when Shell adopts found leakage (D) <br .> (A) native compression (B) air compressor compressed air pressure (C) (D) nitrogen <br> 57, electromagnetic valve open and close the spirit because the Ministry (D) <br> (A) the valve wear (B .) operating voltage too high (C) work in the media as a liquid (D) horizontal installation <br> 58, refrigeration compressor suction temperature below should beTemperature due to (D) <br> (A) thermal expansion valves open through small ( .B) the heat load reduction in cold storage (C) the evaporator surface frosting too few (D) refrigerant charge in excess <br> 59, horizontal shell condenser outlet water temperature higher than the inlet water temperature (C) 0C. <br> .(A) 1 ~ 2 (B) 2 ~ 3 (C) 4 ~ 6 (D) 7 ~ 10 <br> 60, in the same evaporator, use the same kind of refrigerants, the heat transfer coefficient with the boiling temperature ( .A) <br> (A) but increased (B) reduce elevated (C) reduce and enlarge (D) reduce and reduce <br> 61, best-in-the-ordinary condenser cooling water flow velocity to (B) m / .s. <br> (A) 0.4 ~ 0.5 (B) 1.5 ~ 3 (C) 0.8 ~ 1.2 (D) 0.5 ~ 0.7 <br> 62, can determine the hd figure air status set of parameters is (B). < .br> (A) d, Pc (B) t, d (C) t, ε (D) h, ε <br> 63, on air, wet cooling temperature decrease after processing (B). <br> (A) .enthalpy value unchanged, moisture content, relative humidity decrease (B) enthalpy drop, moisture content does not change, the relative humidity increases (C) enthalpy drop, moisture content, relative humidity (D) enthalpy increases moisture content does not change, the relative .humidity increases <br> 64, direct air conditioning system in the summer run time (C) open heater <br> (A) to (B) are not allowed to (C) in accordance with the accuracy requirements (D) under the base .requirements <br> 65, an instrument for determination of air flow are (A). <br> (A) mechanical, thermal and dynamic load type, etc. (B) the rate of impeller-type, heat and pressure-type < .br> (C) the mechanical, rotor type and pressure manometry and (D) mechanical, thermal conductivity and differential pressure type <br> 66, cooler cooling capacity is calculated as (D) <br> (A) Q = ρ (h1 .-h2) (B) Q = G (d1-d2) (C) Q = V (h1-h2) (D) Q = G (h1-h2) <br> 67, air heater heating value of the formula is ( .A) <br> (A) Q = GCp (t1-t2) (B) Q = GCp (h1-h2) (C) Q = GCp (d1-d2) (D) Q = GCv (t1-t2) < .br> 68, civil construction General indoor air relative humidity (). <br> (A) 20% ~ 40% (B)) 40% ~ 60% (C) 60% ~ 80% (D) 30% ~ 50% .<br> 69, does not belong to the air conditioning system air flow adjustment method is (). <br> (A) baseline air law (B) air outlet coefficient method (C) paragraph branch method (D) uniform distribution method < .br> 70. in the diagram, drawing hd determines the dew point temperature is by air status points (C), the temperature is the dew point temperature. <br> (A) make, d line and Φ = 95% Intersect (B .) and h lines and Φ = 95% lines intersect <br> (C), d line and Φ = 100% line intersection (D) and h lines and Φ = 100% line intersection <br> 71, electronic temperature controller for temperature .measuring circuit generally use sensors (D). <br> (A) linear characteristics, temperature changes to capacitance change <br> (B) linear characteristic, will convert the nonlinear temperature variation <br> (C) capacitance characteristics, temperature fluctuation in .converted to capacitance change <br> (D) temperature characteristic changes of temperature fluctuation will be converted to resistance movements change <br> 72, inverter compressor high-speed operation (D). <br> (A) any question without consideration (B .) to consider the issue of leakage rate increase <br> (C) to consider the issue of reducing the quantity of lubricant (D) to consider the valve flow resistance increases the problem <br> 73, 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> 74, single-stage centrifugal compressor .modulation method for cold quantity (A). <br> (A) Regulation of inlet guide vane (B) Regulation of rotation speed (C) adjust the cooling water (D) bypass valve throttle control <br> 75, centrifugal chillers, cooling .water temperature through high water flow is too small, can cause (A). <br> (A) unit power consumption increases, causing a surge (B) condensing temperature reduction unit outages (C) evaporation temperature reduction unit outages (D) condensing .pressure decrease, unit outages <br> 76, centrifugal turbine exhaust system is to remove the piston compressor-free pump, its action shows a (B) continue to compress the air above it Non-Condensable Gas. <br> (A) solid .piston (B) liquid piston (C) gas piston (D) manual piston compressor <br> 77, in LIBR absorption chiller, water is the refrigerant, lithium bromide is (C). <br> (A) desiccant (B) coolant .(C) absorption agent (D) desiccant <br> 78, double refrigeration cycle, solution concentration, in-line process generally takes to (B). <br> (A) ξm-ξa = (5 ~ 10)% ξr- .ξm = (10 ~ 15)% <br> (B) ξm-ξa = (2.5 ~ 3.5)% ξr-ξm = (1.5 ~ 2.5)% <br> (C) ξm-ξa = (4.5 ~ 5.5)% .ξr-ξm = (4.0 ~ 4.5)% <br> (D) ξm-ξa = (1 ~ 2)% ξr-ξm = (3 ~ 5)% <br> 79, lithium bromide refrigeration equipment cooling capacity adjustment, adjustable .through (D) to maintain cold water outlet temperature constant. <br> (A) (B) evaporation temperature condensation temperature (C) of the cooling water temperature (D) cooling capacity <br> 80, LIBR absorption chiller when powered on when .opening the steam valve requirements (B). <br> (A) rapid opening (B) slow opening (C) first openedKai (D) opened at the same time with pump <br> 81, LIBR absorption chiller outage (C). .<br> (A) first gateway solution pumps (B) first off refrigerant pump (C) to close the steam valve (D) take off power <br> 82, LIBR in vacuum conditions, evaporator and absorber and absolute pressure is atmospheric pressure .and (D) <br> (A) 100% (B) 80% (C) 20% (D) 1% <br> 83, LIBR absorption chiller long downtime is required (B). <br> (A) and .(B) protection of oxygen and nitrogen protection (C) only the absorber and generator solution mix (D) maintain vacuum <br> 84, (D) the system uses vacuum valve. <br> (A) screw chiller (B) reciprocating .chillers (C) Rotary piston type refrigerator (D) LIBR absorption chiller <br> 85, ball valve is used for (B) adjustment and automatic throttle valve. <br> (A) (B) gas-liquid level (C) pressure .(D) temperature <br>.