【 Weak current College 】 the air conditioning with cooling technology law questions and answers 8---Power By 【 China power house network 】

Second, multiple choice,
1, closed system refers to the system and the outside world (C)
(A) var swap (B) No heat exchange (C) non-quality Exchange (D) no Exchange
2. for the thermal throttling process, the following assertion error is (D)
(A) due to adiabatic process throttling, friction Sassafras refrigerants of entropy increase
(B) because the runner cross-section suddenly shrinks, the refrigerant to overcome local resistance and pressure drops
(C) refrigerants in the throttling device into, exit enthalpy equal
(D) due to adiabatic process, so the temperature does not change
3, the evaporator refrigerant evaporating dryness x change to (A)
(A) by gradually increasing the x = 0 to x = 1 (B) x = 0 no change (C) consists of x = 1 and gradually reduced to x = 0 (D) x = 1 unchanged
4. certain quality some ideal gas, if the pressure remains unchanged, its volume increases by (A)
(A) temperature rise (B) temperature decrease (C) temperature does not change (D) the temperature and volume without any relationship
5, for changing process, when the variable exponent n = k, a process to (D)
(A) pressure process (B) sizing process (C) fixed temperature process (D) for entropy process
6, for changing process, when the variable exponent n = 1, a process to (C)
(A) pressure process (B) sizing process (C) fixed temperature process (D) for entropy process
7, for changing process, when the variable exponent n = +-infinity, a process of (B)
(A) pressure process (B) sizing process (C) fixed temperature process (D) for entropy process
8, the following is correct as (C)
(A) heat can spontaneously from cryogenic to high temperature object body
(B) you can create an engine, it can be made from a heat source, so that the full heat into mechanical energy (
(C) all thermodynamic process has a direction, the conversion of their energy use has certain limits
(D) of the engine cycle efficiency of maximum value is 100%
9,refrigerants of quality and volume of refrigerants (C)
(A) temperature proportional to (B) volume inversely (C) is inversely proportional to the density (D) the pressure is inversely proportional to the
10, heating cycle heating coefficient is defined as (B)
(A) from the absorption of heat at low temperature heat source and recycling ratio of consumption of accomplishment
(B) to high-temperature heat source emits heat and recycling ratio of consumption outside for
(C) from the absorption of heat at low temperature heat source and to high temperature heat source emits heat ratio
(D) than the same heat source of refrigeration cycle refrigerating factor 1
11, the refrigerant flowing through the condenser condensation (A)
(A) give off heat, and let the heat value equal to the enthalpy (B) give off heat, enthalpy value increase
(C) absorb heat from the outside world, enthalpy value increase (D) as a result of condensation process pressure unchanged, enthalpy value unchanged
12, a reverse Carnot cycle of high-temperature heat source temperature is 28oC, low temperature heat source temperature is-18oC. The refrigeration cycle refrigeration coefficient for ()
（A）0.39（B）5.5（C）-0.39（D）6.5
13. for cyclic process, working through a series of state changes and return to the initial state, its parameters change (D)
(A) internal energy, heat, power changes 0
(B) the amount equal to the outside world can change to system of heating and the difference between the external output power, and is not equal to 0
(C) internal energy variation is greater than 0, heat, power of variation depending on the circumstances
(D) the amount can be changed to 0, external output power equal to the outside world and to the system's thermal
14, and corresponds to the absolute 28oC temperature scales to (C).
（A）-245K（B）82.4K（C）301K（D）245K
15. about the critical state of refrigerants, the following is true of (A)
(A) for the refrigerant, its critical temperature should be much higher than the ambient temperature
(B) when the pressure is higher than the critical value, only increase the pressure to make the changes from a gaseous refrigerant liquid
(C) critical pressure is the maximum working pressure
(D) refrigeration cycle condensing pressure is approaching critical pressure, the higher the recycling efficiency
8, the comprehensive and thorough overhaul, exclude all potential risks, adjust the device to the best State known as (D)
(A) the warranty (B) minor repairs (C) in (D) overhaul
9, handheld tachometer test speed centrifugal, you should use (D)
(A) circle friction head, read from the table to the conversion of reading (B) taper friction head, read from the table to the conversion of reading (C) friction head, can be read directly from the table on the speed of reading (D) taper friction head, can be read directly from the table and reading speed
10, use ventilation to wet and dry bulb thermometers brazing, to equipment placed in the GEODESIC environment so that the instrument to temperature (C)
(A) lower than the wet bulb temperature (B) higher than the wet bulb temperature (C) equal to the temperature of the environment (D) equal to the dew point temperature of the environment
11, using atmospheric pressure gauge (B) to consider
(A) the effect of humidity (B) effect of temperature (C) the effect of wind speed (D) the impact of the season
12, vane anemometers suitable measurement (D)
(A) air duct Mainland air speed (B) table coolers and air flow speed in (C) air conditioning room interior air speed (D) the return of fresh air, air and air speed
13, tilt decline pressure gauge (C)
(A) can be used to measure pressure (B) can be used to measure pressure differential (C) used in conjunction with the pitot pressure measurement (D) used in conjunction with the pitot tube differential pressure measurement
16. as refrigerants in the evaporator temperature of boiling vaporization, same pressure 5oC compressor suction temperature 15oC, the compressor suction superheat oC for (B).
（A）15（B）10（C）5（D）-10
17, refrigerant heat absorption or heat, the temperature does not change, just set state changes, such as transfer of heat (D)
(A) of the receiver (B) heat release (C) (D) the sensible heat of latent heat
18, join fan outlet pipe should remain straight pipe, length of not less than the export side length (C) times.
（A）1.0~2.0（B）1.0~2.5（C）1.5~2.5（D）1.5~3.0
19. for reaction fluid pressure pressure indicates that the value of reading any of the following, which (A) is not correct.
(A) absolute pressure (B) relative pressure (C) table pressure (D) degree of vacuum
20, fridge condenser heat transfer to (D).
(A) thermal conductivity of (B) convection (C) radiation heat (D) combined heat
21, equation Q = KA (t1-t2)-K as in (D).
(A) (B) thermal conductivity of heat transfer coefficients (C) radiation surface heat transfer coefficients (D) heat transfer coefficient
22, equation Q = α-Δ t A K as in (B)
(A) (B) thermal conductivity of heat transfer coefficients (C) radiation surface heat transfer coefficients (D) heat transfer coefficient
23, equation Q = α (t1-t2)-α as in (C).
(A) (B) thermal conductivity of heat transfer coefficients (C) radiation surface heat transfer coefficients (D) heat transfer coefficient
24, equation Q = λ (tw1-tw2) A/λ-σ is referred to in (A) materials.
About 25, body temperature 37Oc, human air cooling of the main form (B)
(A) conduction heat (B) convection cooling (C) radiation heat (D) evaporative cooling
(A) (B) thermal conductivity of heat transfer coefficients (C) radiation surface heat transfer coefficients (D) heat transfer coefficient
26, shell and tube condenser belongs to (D) heat exchanger.
(A) air cooling (B) hybrid (C) regenerative (D) wall
27, washer belongs to (B) heat exchanger.
(A) air cooling (B) hybrid (C) regenerative (D) wall
-28, surface (D) cooler is part of the heat exchanger.
(A) air cooling (B) hybrid (C) regenerative (D) wall
29, air conditioner evaporator belong to in (C) heat exchanger.
(A) shell and tube tube (B) (C) finned tube (D) plate
30, large and medium-sized chillers in water-cooled condenser uses (A) heat exchanger structure.
(A) shell and tube tube (B) (C) finned tube (D) plate
31, air-cooled heat pump chillers of condenser belongs to (C) heat exchanger.
(A) shell and tube tube (B) (C) finned tube (D) plate
32, according to the chemical structure of the classification, freon refrigerant belongs to (B) class.
(A) inorganic compounds (B) saturated hydrocarbon derivatives
(C) mixed liquid hydrocarbons (D)
33, air-conditioning systems the best refrigerant is (B)
(A) air (B) water (C) salt water (D) organic compounds
34, frozen oil features (C)
(A) heat-resistant and not solidified (B) heat-resistant and not vaporization (C) low temperature-resistant and not solidified (D) low temperature resistance than vaporization
35, R22, R717 refrigerant compressors are more should use (D).
（A）N15（B）N22（C）N32（D）N46
36, R134a refrigerant compressors (D) should be used as a lubricant.
(A) mineral oils (B) synthetic hydrocarbon oil (C) alkylbenzene oils (D) esters family oil
37, following refrigerants (C) is a non-azeotropic solution.
（A）R134a（B）R290（C）R407c（DR502
38, the Montreal Protocol and the relevant international agreement provides for developing countries (C), cut off, disable CFC refrigerants.
（A）1995（B）2000（C）2005（D）2010
39, the Montreal Protocol and the relevant international agreement developed deactivate time for HCFCs (B)
（A）2020（B）2030（C）2040（D）2050
40, absorbent is absorbed in the evaporator (D) refrigerant.
(A) saturated liquid (B) is not saturated liquid liquid (C) (D) gas vaporization
R134a refrigerant is 41, freon refrigerants in (C) class.
（A）CFC（B）HCFC（C）HFC（D）HC
42, freon inmoisture content should be controlled at (D) below.
（A）2.5%（B）0.25%（C）0.025%（D）0.0025%
43, there is no atmospheric ozone layer destruction of refrigerants is (C)
（A）R12（B）R22（C）R717（D）R502
44, with R134a miscible lubricant is (D)
(A) (B) N32 N22 (C) N46 (D) synthetic ester oil
45, salt water as refrigerant use primary disadvantage is (A)
(A) (B) corrosion contained small heat capacity (C) solidification temperature is high (D) higher prices
46, organic compounds and its aqueous solution as refrigerant use primary disadvantage is (D)
(A) (B) corrosion contained small heat capacity (C) solidification temperature is high (D) higher prices
47, lithium bromide solution of PH value should be adjusted to (C) range.
(A) (B) the following 7.5 7.5 ~ 9.5 (C) 9.5 ~ 10.5 (D) above 10.5
48, lithium bromide solution has a corrosive effect on metals and generates (D)
(A) the oxygen (B) air (C) CO2 (D) hydrogen
49, vapour compression refrigeration system, when the condensation temperature, (B) will increase.
(A) refrigeration capacity (B) compressor power consumption (C) the volume of suction quality (D) the amount of refrigerant loop
50, steam compression refrigeration system, when evaporation temperature drops, (C) will increase.
(A) refrigeration capacity (B) compressor power consumption (C) the volume of suction quality (D) the amount of refrigerant loop