Weak current College】 【the air conditioning with cooling technology law questions and answers reference 16 --- Power By】 【China power house network.

<br> 2. short answer question: <br> 1, thermodynamics, a theorem in thermodynamics of what role in? (5 min) <br> <br> <br> <br> <br> <br> <br> .2. refrigeration and air conditioning equipment management what content? (5 min) <br> <br> <br> <br> <br> <br> 3, the normal operation of equipment maintenance purposes in? (5 min) <br .> 121111 practical fluid flow, its internal adjacent there between the two layers () <br> (A) by the attractiveness of friction (B) (C) (D) repel each other forces driving force <br> 2. welding of copper .tube () is preferred <br> (A) welding (B) silver brazing (C) copper brazing (D) ti brazing <br> 3, freon cooling system pressure leak can be found () <br> (A) native compression .(B) air compressor compressed air pressure (C) (D) nitrogen <br> 4, refrigeration compressor suction temperature below should have temperature because () <br> (A) thermal expansion valves open through small (B) the heat load reduction .in cold storage (C) evaporation of surface too few received Frost (D) refrigerant charge in excess <br> 5, electromagnetic valve opening and closing of reason is () <br> (A) the valve wear (B) operating voltage is .high (C) work in the media as a liquid (D) horizontal installation <br> 6, horizontal shell condenser outlet water temperature higher than the inlet water temperature () 0C. <br> (A) 1 ~ 2 (B) 2 .~ 3 (C) 4 ~ 6 (D) 7 ~ 10 <br> 7, in the same evaporator, use the same kind of refrigerants, the heat transfer coefficient with the boiling temperature () <br> (A) but increased ( .B) reduce elevated (C) reduce and enlarge (D) reduce and reduce <br> 8, evaporation pressure control valve under (D) direct and lead the valve and the main valve unit. <br> (A) evaporation area size ( .B) expansion valve capacity (C) condensing area size (D) size <br> 9, lgp-h figure is to (B) as abscissa. <br> (A) pressure (B) temperature enthalpy (C) (D) .entropy <br> 10, in lgp-h enthalpy diagram, the line in the hot zone and (A) vertical. <br> (A) the isobars (B) isotherms (C) specific capacitance cable (D) isentropic line <br .> 11, when the two fluids, heat transfer and export in the heat, the temperature difference is large, the mean temperature difference can be (A) the average temperature difference calculation. <br> (A) logarithm (B) the arithmetic ( .C) index (D) function <br> 12, in the throttling device. Because the throttling time flow soon, as no heat to the outside world, the surrounding enthalpy value (A). <br> (A) equal (B) .(C) (D) the increased reduction <br> 13, along the loss occurs during the fluid movement of (A). <br> (A) a segment of a straight tube (B) (C) elbow reducer Park (D .) valve Department <br> 14, in the refrigeration system installation, minimizing the pipeline (D). <br> (A) length (B) the weight of wall thickness (C) (D) bending <br> 15, air- .cooled condenser surface heat air flow pattern is (A) <br> (A) turbulence (B) (C) ease of laminar flow (D) the fast stream <br> 15, at certain temperatures, (C) the maximum refrigerating factor .. <br> (A) refrigeration cycle (B) (C) the Carnot cycle reverse Carnot cycle (D) heat pump cycle <br> 16, refrigeration system with a heat cycle of overheating is (C) <br> (A) .natural thermal (B) harmful overheating (C) useful heat (D) forced hot <br> 17, heat pump cycle heat source is taken from (A) <br> (A) (B) compressor and condenser (C) electric heating .tube (D) environment <br> 18, in lg-ph map, unit weight cooling capacity qo is to (B). <br> (A) temperature difference (B) (C) enthalpy differential pressure (D) dry degree difference .<br> 17, condenser surface fluids to turbulent flow of (B) capacity. <br> (A) of the receiver (B) (C) cooling heat (D) vaporization <br> 18, refrigerant (D) higher, at .room temperature to liquefaction. <br> (A) of the exhaust gas temperature (B) temperature (C) saturation temperature (D) critical temperature <br> 19, dichlorotetrafluoroethane refrigerant is the code name (D). <br> (A .) R123 (B) R290 (C) R22 (D) R134a <br> 20, compressor refrigeration oil must adapt to the particular requirements of the refrigeration system, able to (D). <br> (A) heat-resistant and not .solidified (B) is a high temperature without vaporization (C) low temperature resistance instead of vaporization (D) low temperature-resistant and not solidified <br> 21, impact compressor gas transmission coefficient of the most important factor is (D). < .br> (A) inspiratory pressure (B) (C) the discharge pressure pressure difference (D) compression ratio <br> 22, evaporation temperature-15oC, condensing temperature + 30oC, suction temperature + 15oC, cold temperature + 25oC, (C .) operating conditions. <br> (A) air conditioning (B) refrigerator (C) standard (D) maximum shaft power <br> 23, the suction temperature air-conditioning operation the superheat is 15oC (B). <br> ( .A) +5 oC (B) +10 oC (C) +15 oC (D) +20 oC <br> 24, modern high-speed multi-cylinder closed compressor cylinder number up to (B) of the cylinder. <br> (A) .3 (B) 4 (C) 6 (D) 5 <br> 25, in a piston components are (C) <br> (A) a gas ring, an oil ring (B) a gas ring, the second oil ring .(C) second gas ring, an oil ring (D) of the second gas ring, the second oil ring <br> 26, screw compressor rotor is composed by (D). <br> (A) two-rotor (B) .two Yin rotor (C) two gears (D) a rotor and a yin and Yang rotor <br> 27, apply to water deficit zone of condenser type is (A) the condenser. .<br> (A) (B) for evaporative water-cooled (C) natural air cooling type (D) forced air-cooled <br> 28, horizontal shell condenser site flow and is (C) <br> (A) refrigerant .(B) brine (C) cooling water (D) chilled water <br> 29, cold drink tank and cooler is a (A) the evaporator. <br> (A) (B) immersion air-cooled finned (C) dry .-type (D) full-hydraulic <br> 30, depending on the liquid mirror main role is to check the refrigerant (A). <br> (A) flow (B) (C) the degree of oily water level (D .) the degree of impurity <br> 31, solenoid valve in the refrigeration system should be installed in (B) <br> (A) evaporators and compressors (B) storage dispenser and expansion valve (C) the condenser and reservoir fluid (D .) oil separator and condenser <br> 32, thermostatic expansion valve of energy should be (A) the amount of estate cold compressor. <br> (A) is greater than 120 per cent (B) greater than 180% (C) is .less than (D) equal to <br> 33, when inside temperature too high or too low. By adjusting the adjusting screw (B) for a graceful. <br> (A) temperature difference (B) temperature range (C) the .temperature of defrosting (D) parking temperature <br> 34, () <br> <br>.