Skills and Trades

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Three types of fan blades used with centrifugal fans include: A) Forward-curved, backward-curved, ... Started by ap345	3 Replies 55 Views	Jul 24, 2018 by macagn
A technician finds that a wire in an electric furnace is brittle and discolored from overheating. ... Started by viki	1 Replies 38 Views	Jul 24, 2018 by carlsona147
Reduces flash gas in the liquid line D) oil separator What will be an ideal ... Started by audragclark	1 Replies 26 Views	Jul 24, 2018 by honnalora
Removes oil from discharge gas B) liquid line dryer What will be an ideal ... Started by NguyenJ	1 Replies 25 Views	Jul 24, 2018 by shoemake
How is a concentric vent used in a high-efficiency furnace? A) It creates two close exit points ... Started by drink	3 Replies 35 Views	Jul 24, 2018 by fdliggud
Why do gas furnace efficiencies jump from 80 percent to 90 percent? A) The blower used with 85 ... Started by cmoore54	1 Replies 87 Views	Jul 24, 2018 by Mholman93
The formula for calculating the CFM needed to produce an air change is: A) CFM = (floor area ... Started by Chloeellawright	1 Replies 66 Views	Jul 24, 2018 by sultana.d
The condensate drain on a rooftop unit: A) Does not require any type of drain line. B) Is ... Started by LaDunn	1 Replies 94 Views	Jul 24, 2018 by asdfghjkl;
In refrigeration and air conditioning, safety controls are wired: A) In either series or parallel ... Started by neverstopbelieb	3 Replies 95 Views	Jul 24, 2018 by Alyson.hiatt@yahoo.com
To prevent the system refrigerant from quickly dropping in temperature and pressure, refrigerant ... Started by penguins	1 Replies 81 Views	Jul 24, 2018 by deja
What is the maximum safe fill weight of a recovery cylinder with a tare weight of 30 lb, a water ... Started by hubes95	1 Replies 130 Views	Jul 24, 2018 by ambernicolefink
Alternating current frequency is measured in: A) Bandwidth (BW). B) Power Width Modulations ... Started by armygirl	1 Replies 107 Views	Jul 24, 2018 by Dunkey
Electrical conductors listed in order of best to worst are: A) Gold, silver, copper, aluminum. B) ... Started by APUS57	3 Replies 30 Views	Jul 24, 2018 by fatboyy09
To speed up refrigerant recovery: A) Recover from only one side of the system at a time. B) Use ... Started by SGallaher96	1 Replies 99 Views	Jul 24, 2018 by Brummell1998
In general, a system that is undercharged will have: A) A high subcooling and a high superheat. ... Started by khang	1 Replies 54 Views	Jul 24, 2018 by jazzlynnnnn
What category of electric meter is intended for measurement at the electric meter base? A) ... Started by bobthebuilder	1 Replies 130 Views	Jul 24, 2018 by juwms
Most air-cooled equipment manufactured today is designed to operate with a: A) 120F condenser at ... Started by Wadzanai	3 Replies 79 Views	Jul 24, 2018 by onowka
What is a transient voltage? A) A voltage that is traveling from one part of the circuit to ... Started by lbcchick	1 Replies 173 Views	Jul 24, 2018 by emsimon14
Wattmeters read true power in a circuit. This can be expressed by what equation? A) Power = amps ... Started by Hungry!	1 Replies 47 Views	Jul 24, 2018 by spencer.martell
A device that does not switch on and off motors directly is a: A) Heavy-duty relay. B) Contactor. ... Started by ssal	1 Replies 89 Views	Jul 24, 2018 by miss.ashley
Which of these can be used as a switching relay? A) Heavy-duty relay B) Motor starter C) ... Started by melly21297	3 Replies 84 Views	Jul 24, 2018 by janeli1
Returning water temperature, along with the water flow through the evaporator, are critical ... Started by karen	1 Replies 42 Views	Jul 24, 2018 by kalskdjl1212
In general, a system that is overcharged will have: A) A low subcooling and a high superheat. B) ... Started by laurencescou	1 Replies 27 Views	Jul 24, 2018 by meganlapinski
Root-mean square (RMS) is a mathematical formula for: A) Determining the price of a replacement ... Started by khang	1 Replies 28 Views	Jul 24, 2018 by cici
Even with the correct refrigerant charge, a water-cooled system would appear overcharged if: A) ... Started by cnetterville	3 Replies 60 Views	Jul 24, 2018 by dantucker