Skills and Trades

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To get the best reading, the refrigerant sensor should be located where? A) Where the leak is ... Started by Melani1276	1 Replies 28 Views	Jul 24, 2018 by lorealeza77
How can infrared light be used to detect refrigerant? A) Infrared sensors change resistance in ... Started by jeatrice	1 Replies 51 Views	Jul 24, 2018 by janieazgirl
Which legal framework calls for a prohibition on venting ozone-depleting refrigerants,restrictions ... Started by khang	1 Replies 28 Views	Jul 24, 2018 by jojobee318
After adding refrigerant to a nonpressurized container used with a system-dependent recovery device, ... Started by Garrulous	3 Replies 39 Views	Jul 24, 2018 by kilada
The EPA requires the repair of refrigerant leaks: A) For all types of leaks in all kinds of ... Started by anshika	1 Replies 51 Views	Jul 24, 2018 by jxjsniuniu
A product that is fully manufactured, charged, and hermetically sealed in a factory with 5 lb or ... Started by james	1 Replies 31 Views	Jul 24, 2018 by kishoreddi
What makes a material a good electrical conductor? A) Having a large number of free protons B) ... Started by vicotolentino	1 Replies 39 Views	Jul 24, 2018 by JYan
What is the maximum safe amount of refrigerant for a recovery cylinder with a water capacity of 50 ... Started by cabate	3 Replies 445 Views	Jul 24, 2018 by manuelcastillo
Which of the following is an indicator of a leaking refrigerant system? A) Visible line bracing ... Started by saraeharris	1 Replies 18 Views	Jul 24, 2018 by rleezy04
The electromotive force that causes electrons to move along a conductor is called: A) ... Started by Pea0909berry	1 Replies 35 Views	Jul 24, 2018 by nanny
Why is it necessary to use special methods when recovering from Type III systems? A) Most of ... Started by bobypop	1 Replies 12 Views	Jul 24, 2018 by l.stuut
How does dye indicate system leaks? A) The dye reacts with the refrigerant, making the inside of ... Started by Kthamas	3 Replies 59 Views	Jul 24, 2018 by xiaomengxian
If an electric heater is rated at 15,000 W, and the voltage used is 240 V, what size breaker in amps ... Started by go.lag	1 Replies 133 Views	Jul 24, 2018 by ebonylittles
The preferred method for raising the pressure of a low-pressure chiller in order to test for leaks ... Started by silviawilliams41	1 Replies 56 Views	Jul 24, 2018 by pocatato
Why should some refrigerants NOT be recovered? A) Older machines may hold toxic chemicals. B) ... Started by xroflmao	1 Replies 80 Views	Jul 24, 2018 by InfiniteSteez
Vacuum pumps are rated by: A) Blank-off pressure. B) CFM capacity and blank-off pressure. C) ... Started by fasfsadfdsfa	3 Replies 165 Views	Jul 24, 2018 by joewallace
Which of the following measures is a perfect vacuum if absolute measurement is used? A) 0 in Hg ... Started by panfilo	1 Replies 36 Views	Jul 24, 2018 by amanda_14
Why should liquid refrigerant NOT be introduced into an evacuated chiller? A) The liquid can ... Started by jessicacav	1 Replies 99 Views	Jul 24, 2018 by leannegxo
What is the normal frequency of AC power in the United States? A) 50 cycles per second B) 60 ... Started by tnt_battle	1 Replies 18 Views	Jul 24, 2018 by ecabral0
An air conditioner with a fixed-restriction metering device is operating with an evaporator ... Started by faduma	3 Replies 40 Views	Jul 24, 2018 by pallen55
The three essential requirements for a useful electric circuit are: A) A power source, a magnetic ... Started by NguyenJ	1 Replies 25 Views	Jul 24, 2018 by mjenn52
When testing a normally open relay contact with a de-energized coil it should measure: A) 0. B) ... Started by HCHenry	1 Replies 101 Views	Jul 24, 2018 by choc0chan
What type of meter do HVACR technicians use to measure current? A) An in-line wattmeter B) A ... Started by olgavictoria	1 Replies 49 Views	Jul 24, 2018 by joechoochoy
The standard AHRI design condition used for rating unitary air-conditioning equipment is: A) 80F ... Started by RRMR	3 Replies 39 Views	Jul 24, 2018 by Jayson
With its leads on either side of a switch, a voltmeter reads 120 V. This indicates that: A) The ... Started by Davideckstein7	1 Replies 60 Views	Jul 24, 2018 by Alyson.hiatt@yahoo.com