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Terms in this set (34)When replacing and old polychlorinated Biphenyl Dielectric ( PCB ) capacitor the old capacitor must be disposed of _______ 1. with common trash in the dumpster Answer 4 MRAC page 403 20th edition ??? In absorption refrigeration systems lithium bromide is used as the refrigerant. What is the maximum percentage by weight of lithium bromide before crystallization will begin at temperatures below 110 F 1. 35 % Answer 4 Page 890, 21st edition What is the purpose of the external equalizer in a thermostatic expansion valve ? 1. Compensates for pressure drop in the evaporator Answer 1 page 479 , 21th edition What is the proper way to size a liquid receiver for a commercial refrigeration or air conditioning system? 1. Sized to hold 50%
of the refrigerant charge Answer 3 page 1347, 21st edition The highest Temp at which substance may be liquefied, regardless of pressure applied upon it called ____ ? 1. Enthalpy Answer 4 page 73, 21st edition 32 F is equal to ____ Rankin degrees ? 1. 32 degrees Answer 4 page 59, 21st edition A 12 psig pneumatic control system has an operating pressure range of ___ PSIG to ____ psig ? 1. 0 - 12 psig Answer 2 page 840, 21st edition What is the refrigerant code number for nitrogen ? 1. R - 407C Answer 4 page 178 21st edition Wat is the most rapid method of adding refrigerant to a semi- hermetic compressor ? 1. Valve off compressor and add oil with a refrigerant oil
pump Answer 3 page 1466, 21st edition What is the allowable pressure drop across a suction line filter drier when used for air conditioning duty ? 1. 6 psi Answer 4 page 550, 21st edition What is the minimum test pressure for refrigerant pipe installations when using air - cooled equipment and R -410A refrigerant ? 1. 169 psig Answer 3 Page 1375, 21th edition When fuel oil is subjected to excess vacuum it begins to ______ 1. thicken Answer 3 page 1134, 21st edition What is a typical application of the vortex tube cooling principals ? 1. Aircraft cooling Answer 4 page 1287, 21st edition The cooling of a liquid refrigerant below its condensing temperature. 1. Sublimation Answer 2 page 66 21st edition A three - phase air handler motor is running backwards, how is the rotation changed ? 1. Reversing the high voltage and low voltage # 2 taps Answer 2 page 325, 21st edition When installing a thermostatic expansion valve sensing bulb on a vertical suction line, The bulb should be mounted so the capillary tube entering the sensing bulb is ______ ? 1. At the top Answer 1 page 483, 21st edition A temperature of 40 C is equal to ___ F ? 1. 40 F Answer 4 page 59, 21st edition The term " Dirty sock syndrome " refers to ? 1. Mold odors in bathroom ducts Answer 3 page, 1075 21st edition _________ is used primarily in square and rectangular ducts to restrict or completely shut-off the flow of air to a room or zone ? 1. Volume damper Answer 3 page 739, 21st edition How many BTU of heat energy is required to melt 2000 pounds of ice in a 24 - hour period ? 1. 12,000 btu Answer 4 page 66, 21st edition Many room air conditioners use ________ compressors. 1. Rotary compressors Answer 2 page 786, 21st When internally insulating metal rectangular duct, how much glue coverage is recommended on the metal duct before the insulation is applied. 1. 50 % coverage Answer 3 page 735, 21st edition Line voltage thermostats may control loads up to ___ amps. 1. 10 amps Answer 4 page 923, 21st edition A systems control differential is the difference between _____________. 1. Heat in and heat out Answer 2 Page 339, 21st edition What is the difference between brazing and soldering . 1. Filler metal is harder Answer 4 page 146, 21st edition What is the purpose of flux. 1. To keep pipe and tube joints clean Answer 2 page 146, 21st edition How many cubic feet of volume does one pound of standard are occupy ? 1. 5.05 cubic feet Answer 2 page 55, 21st edition The _____ point is where wax separates from refrigerant oil. 1. wax point test Answer 3 page 179, 21st edition ________ is the instantaneous evaporation of liquid refrigerant that cools the remaining refrigerant to the desired evaporator temperature. 1. Flash gas Answer 1 page 91, 21st edition A refrigerant designed to replace R - 22 that consists of 23 %, R-22, 25 %, R -32, 25 %, R 125 and 52 % R-132 a 1. R-410 A Answer 2 page 174, 21st edition When installing vibration isolators, there location should be _______ ? 1. Within 8 inches of the compressor Answer 4 page 462, 21st edition A ______ delivers a concentrated airstream into a room ? 1. Grill Answer 3 page 738, 21st edition to control vibration when compressors with spring isolators are use, the isolators should be ______ ? 1. kept fully seated Answer 3 Page 1364, 21st edition When brazing refrigerant lines to equipment, what precautions should be taken ? 1. keep a fire extinguisher readily accessible Answer 2 page 1365, 21st edition Sets with similar terms목요일 5과45 terms quizlette2297126 777 - Navigation56 terms danielatwell Physical Training20 terms Cleoj607 B777 - Communication - Updated27 terms krayw Sets found in the same folderTechnical exam 1 Hvac46 terms Juan_Alvarado24 Technical test 2 HVAC53 terms Juan_Alvarado24 Technical test 345 terms Juan_Alvarado24 Laws and Rules Questions10 terms Juan_Alvarado24 Other sets by this creatorSC HVAC EXAM24 terms Juan_Alvarado24 section 17 - residential/light commercial based on…98 terms Juan_Alvarado24 business test II50 terms Juan_Alvarado24 Business Test 150 terms Juan_Alvarado24 Other Quizlet setsChapter 11, 12, 13: Middle Childhood24 terms bethany_dahl5PLUS Ch 2 - Atoms, Bonds, Acids, Base, Molecu…36 terms ariel_endsley PSYC 2050 Midterm159 terms ostermac Permit Test27 terms eddie_cundiff |
Modern refrigeration and air conditioning 21st edition quizlet
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