Skills and Trades

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The total pressure in a mixture of gasses is equal to: A) The highest pressure among the gasses ... Started by Ebrown	1 Replies 58 Views	Jul 26, 2018 by underwood14
When working gas law problems, the results will only be accurate if: A) All pressures and ... Started by Destiiny22	3 Replies 29 Views	Jul 26, 2018 by whitcassie
After heating 2ft3 of gas at 50 psia from 300 R to 600R at 50 psia, the volume of the gas will be: ... Started by littleanan	1 Replies 168 Views	Jul 26, 2018 by akemokai
In a direct expansion chiller: A) The water and refrigerant are mixed in the shell. B) The water ... Started by mmm	1 Replies 49 Views	Jul 26, 2018 by Joc
What is the zero point of an instrument whose 0 output is 5 PSIG and whose 100 output is 15 PSIG? ... Started by vicky	1 Replies 34 Views	Jul 26, 2018 by ankilker
What is the range of an instrument whose 0 output is 5 PSIG and whose 100 output is 15 PSIG? A) 0 ... Started by dbose	3 Replies 30 Views	Jul 26, 2018 by cegalasso
What effect does contact with refrigerant have on a digital leak detector's sensing wand? A) It ... Started by karlynnae	1 Replies 32 Views	Jul 26, 2018 by aadams68
Before using, vacuum gauges using electronic transducers must be: A) Calibrated to 0 microns. B) ... Started by washai	1 Replies 29 Views	Jul 26, 2018 by scrocafella
Analog electronic leak detectors should be checked by exposing them to: A) Pure Nitrogen. B) ... Started by danielfitts88	1 Replies 33 Views	Jul 26, 2018 by raili21
What sort of level adjustments may a technician make to a digital flue gas instrument? A) A flue ... Started by Yi-Chen	3 Replies 77 Views	Jul 26, 2018 by wfdfwc23
Which part of an analog flue gas instrument may alter readings because of voltage and current ... Started by yoroshambo	1 Replies 61 Views	Jul 26, 2018 by jlaineee
When should a technician read the MSDS for a particular refrigerant? A) After being exposed to ... Started by maychende	1 Replies 68 Views	Jul 26, 2018 by connor417
New residential air conditioning systems now primarily use: A) HFC-134a. B) CFC-12. C) HFC-410A. ... Started by yoooooman	1 Replies 83 Views	Jul 26, 2018 by BUTTHOL369
A fluorinated refrigerant whose number starts with a 4 is: A) Flammable. B) A compound. C) ... Started by a0266361136	3 Replies 65 Views	Jul 26, 2018 by Silverbeard98
When looking at the ANSI/ASHRAE Standard 34-201, flammability can be recognized through the: A) ... Started by hbsimmons88	1 Replies 182 Views	Jul 26, 2018 by fffftttt
The temperature where small droplets of liquid first start to form in a saturated gas is known as ... Started by sammy	1 Replies 58 Views	Jul 26, 2018 by Expo
Match the potential injury in the first column with the associated refrigerant hazard in the second ... Started by kfurse	1 Replies 20 Views	Jul 26, 2018 by choc0chan
How can a technician determine when a filter-drier is stopped up and needs changing? A) The ... Started by Shelles	3 Replies 97 Views	Jul 26, 2018 by Loise Hard
Why is the filter drier important? A) It keeps the system clean and dry. B) It keeps the valves ... Started by pragya sharda	1 Replies 74 Views	Jul 26, 2018 by joneynes
To get the best reading, the sensor should be located where? A) Where the leak is less likely to ... Started by Deast7027	1 Replies 87 Views	Jul 26, 2018 by moormoney
Who can legally refill a DOT 39 non-refillable cylinder? A) Only the refrigerant manufacturer B) ... Started by codyclark	1 Replies 51 Views	Jul 26, 2018 by jamesnevil303
An isothermal process is a process which does not change: A) The temperature of the refrigerant. ... Started by krzymel	3 Replies 48 Views	Jul 26, 2018 by Kingjoffery
.Refrigerant characteristics shown on a pressure-enthalpy diagram include: A) Valence, atomic ... Started by lb_gilbert	1 Replies 18 Views	Jul 26, 2018 by Hikerman221
The pressure lines on the P-H diagram: A) Run diagonally from left to right. B) Run vertically ... Started by beccaep	1 Replies 36 Views	Jul 26, 2018 by tsternbergh47
What units are used to measure pressure in HVACR systems in the United States? A) Newtons B) ... Started by sdfghj	1 Replies 67 Views	Jul 26, 2018 by isabelt_18