【 Weak current College 】 the air conditioning with cooling technology law questions and answers 11---Power By 【 China power house network 】

<br> 151, scroll-type water chiller for cooling capacity range (A). <br> (A) 50 ~ 180 (B) 10 ~ 1200 (C) 120 ~ 2200 (D) 350 ~ 35000 <br> 152, .screw chillers with cooling capacity ranging from (C). <br> (A) 50 ~ 180 (B) 10 ~ 1200 (C) 120 ~ 2200 (D) 350 ~ 35000 <br> 153, when the room temperature and set 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> 154, when close to room temperature and set difference ., inverter air conditioner of Converter output frequency of up to (D) HZ. <br> (A) 30 (B) 60 (C) 90 (D) 120 <br> 155, constant temperature and humidity air conditioner temperature control accuracy is .(B) 0C <br> (A) + -0.5 (B) + -1 (C) + -1.5 (D) + -2 <br> 156, machine room exclusively used air conditioner temperature control precision is (A) oC .<br> (A) + -0.5 (B) + -1 (C) + -1.5 (D) + -2 <br> 157, fan coil plus independent fresh air system belong to (B) system. <br> ( .A) (B) the centralized half a centralized-decentralized (C) (D) all air-<br> 158, comfort-speed air conditioning system of air duct system manager wind (C) m / s. <br> (A .) 2 ~ 3 (B) 2 ~ 5 (C) 4 ~ 7 (D) 5 ~ 8 <br> 159, Toshiba electronic temperature refrigerator defrosting is (B) way to defrost. <br> (A) (B) semi .-automatic manual (C) automatic-automatic (D) <br> 160, to accurately measure the wet-bulb temperature, air velocity to (C) m / s. <br> (A) 1 ~ 2 (B) 2 ~ .3 (C) 3.5 ~ 8 (D) 6 ~ 12 <br> 161, Toshiba refrigerator circuits when Us> 4V, Q802 of 2 feet outputs for low level, (C) signals. <br> (A) (B) .for defrosting stop defrosting (C) post (D) downtime <br> 162, Toshiba refrigerator cold room temperature rises. Sensor resistance is reduced, the voltage Us is (A). <br> (A) (B) (C) output .low level (D) output <br> 163, constant temperature and humidity of air conditioners in wetting time (A). <br> (A) compressor must stop (B) you can adjust the compressor refrigeration capacity is 50% (C) .of the compressor could not stop (D) compressor can shut down, or without downtime <br> 164, in the small car air conditioning system circuit is equipped with idle speed control circuit to (C). <br> (A) improve cooling .capacity (B) prevent liquid Hammer (C) low speed stability of the engine speed (D) stable compressor speed <br> 165, central air conditioning and refrigeration systems with normal boot sequence as (B). <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 water pump (delay 1min) → open → cooling water pump cooling fan open → chiller opened <br> 166, constant temperature and humidity of .the air conditioner is running at a constant temperature (C) <br> (A) refrigeration, heating not running (B) refrigeration is not running, the heating operation (C) refrigeration heating runs (D) refrigeration heating will not run <br .> 167, frequency conversion air conditioner in room temperature reaches the set point, (D) <br> (A) compressor and indoor fan have downtime (B) compressor without downtime, indoor fan downtime <br> (B) compressor downtime, indoor .fan without downtime (D) compressor downtime not indoor fan <br> 168, KFR-25G type air conditioner in room temperature set point reached after (A) <br> (A) compressor and indoor fan have downtime (B) compressor without downtime ., indoor fan downtime <br> (C) compressor downtime, indoor fan without downtime (D) compressor downtime not indoor fan <br> 169, air conditioner compressor operation, the operation of the current apparent decrease is due to (D) <br .> (A) the power supply voltage too low (B) excessive dust on the condenser (C) the fan speed is low (D) capillary plug <br> 170, increasing refrigerator hammer initiator inductance coil turns back the results is (C) .<br> (A) increase for low-voltage current pick-up (B) reduce the applicable closing current and high voltage (C) closing current decrease for low voltage (D) closing current increase for high voltage <br> 171, pressure .and temperature controllers, temperature sensor, compressor after the leak appears (B) <br> (A) non-stop (B) does not start (C) startup and shutdown (D) outages frequent <br> 172, reduce refrigerator hammer initiator .inductance coil turns the results is generated after (D) <br> (A) release the current reduced for low voltage (B) release the current increase for high voltage (C) release current unchanged for low voltage (D) release current unchanged for .high voltage <br> 173, single-phase motor run capacitors are used (B) <br> (A) (B) in the electrolytic capacitor paper capacitor (C) oil dielectric capacitor (D) MICA capacitors <br> 174, high .-temperature refrigeration system library only one compressor, in his system at the pipeline should be installed (A) control valve <br> (A) evaporation pressure (B) condensing pressure (C) refrigerant temperature (D) temperature level <br> 175 ., freon system using fusible plug (B) may be melting oC of alloy steel. <br> (A) 50 ~ 60 (B) 70 ~ 75 (C) 80 ~ 85 (D) 90 ~ 100BR> 176, thermocouple temperature measurement .range (D) oC. <br> (A) -30 ~ 600 (B) -60 ~ 550 (C) -120 ~ 550 (D) -200 ~ 1600 <br> 177, mercury (or alcohol) glass thermometer applies .to (A) temperature oC range. <br> (A) -30 ~ 600 (B) -60 ~ 550 (C) -120 ~ 550 (D) -200 ~ 1600 <br> 178, pressure thermometer for temperature measuring range .(B) oC <br> (A) -30 ~ 600 (B) -60 ~ 550 (C) -120 ~ 550 (D) -200 ~ 1600 <br> 179, selection pressure gauge, the pressure being measured by the .maximum value should be in the pressure gauge full of (B) <br> (A) not more than 1 / 2 (B) 1 / 2 to 2 / 3 (C) more than 2 / 3 (D) does not matter < .br> 180, Bourdon tube pressure gauges measuring pulse pressure, the maximum value should be in the full scale of the pressure gauge (A) <br> (A) not more than 1 / 2 (B) 1 / 2 to 2 / 3 .(C) more than 2 / 3 (D) does not matter <br> 181, refrigeration equipment layout should make the pipeline as far as possible short, there is also a certain diameter. In order to reduce (D) <br> ( .(A) pressure (B) (C) the force of gravity (D) resistance <br> 182, freon system to ensure smooth, level of the oil back into the trachea should slope to the compressor. Gradient should be not less than ( .B) <br> (A) 1 / 100 (B) 2 / 100 (C) 3 / 100 (D) 4 / 100 <br> 183, ammonia refrigeration systems installation, to guarantee the condenser and the height of the reservoir and .dispenser should be not less than the difference (B) m. <br> (A) 0.2 (B) 0.3 (C) 0.4 (D) 0.5 <br> 184, refrigeration compressor exhaust pipe horizontal pipe should be along the flow direction of .the had (A) of the slope. <br> (A) 1 / 100 (B2/100) (C) 3 / 100 (D) 4 / 100 <br> 185, compressor exhaust pipe up a long time, exhaust pipe .risers (B) is installed on. <br> (A) stop valve (B) check valve (C) the back pressure valve (D) solenoid valve <br> 186, ammonia system to prevent the hydraulic hammer, should generally be made .level back to the trachea (D) the slope and the evaporator or ammonia liquid separator. <br> (A) 0.1% ~ 0.3% (B) 0.3% ~ 0.5% (C) 0.5% ~ 0.8% (D) 0.5% .~ 1% <br> 187, ammonia system should be slow to open air admittance valve to prevent compressor (B). <br> (A) the discharge pressure is high (B) liquid Hammer (C) high inspiratory pressure (D) .oil temperature is low <br> 188, General freon system vacuum should achieve absolute pressure (B) Kpa. <br> (A) 0.13 ~ 0.40 (B) 2.7 ~ 4.0 (C) 6.5 ~ 7.4 (D) 7.5 ~ 9.0 < .br> 189, General ammonia system vacuum should reach (C) Kpa. <br> (A) 0.13 ~ 0.40 (B) 2.7 ~ 4.0 (C) 6.5 ~ 7.4 (D) 7.5 ~ 9.0 <br> 190, R22 refrigerant system .of high-voltage side of air tightness test pressure Mpa for (D). <br> (A) 1.0 (B) 1.2 (C) 1.6 (D) 1.8 <br> 191, R717 refrigerant system for low-voltage side of air .tightness test pressure Mpa for (B). <br> (A) 1.0 (B) 1.2 (C) 1.6 (D) 1.8 <br> 192, nitrogen cylinders full bottle pressure Mpa for (C). <br> (A) .5 (B) 10 (C) 15 (D) 20 <br> 193, ammonia gas tightness test, test media adoption (C) <br> (A) (B) oxygen-nitrogen (C) compressed air (D) ammonia .<br> 194, freon system tightness tests, test media use (A). <br> (A) (B) oxygen-nitrogen (C) compressed air (D) for freon gas <br> 195, General new refrigeration system the .first refrigerant charge to design values of (B), and then in the system at any time while debugging. <br> (A) 50% (B) 60% (C) 70% (D) 80% <br> 196, .refrigeration system trial run, you should check the lubricant temperature, generally not more than 70oC nor less than (A) oC. <br> (A) 5 (B) 10 (C) 15 (D) 20 <br> 197, refrigeration .system commissioning, oil should be controlled at (B) Mpa. <br> (A) 0.1 ~ 0.2 (B) 0.1 ~ 0.3 (C) 0.3 ~ 0.4 (D) 0.3 ~ 0.5 <br> 198, to water or saline for .refrigerant, through evaporation temperature than refrigerant outlet temperature oC low (B). <br> (A) 2 ~ 4 (B) 4 ~ 6 (C) 5 ~ 10 (D) 10 ~ 15 <br> 199, to air as .a refrigerant, through evaporation temperature than refrigerant outlet temperature oC low (C). <br> (A) 2 ~ 4 (B) 4 ~ 6 (C) 5 ~ 10 (D) 10 ~ 15 <br> The air cooled condenser .200, condensing temperature is generally lower than the air temperature is high (D) oC. <br> (A) 3 ~ 5 (B) 5 ~ 10 (C) 8 ~ 12 (D) 10 ~ 15 <br>.