Skills and Trades

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An R22 system specifies a superheat of 15F at the current operating conditions. The technician ... Started by Garrulous	3 Replies 21 Views	Jul 26, 2018 by ttt030911
An R410A system specifies a subcooling of 5F at the current operating conditions. The technician ... Started by Evvie72	1 Replies 11 Views	Jul 26, 2018 by Yixagurpuldink
An R410A system specifies a superheat of 10F at the current operating conditions. The technician ... Started by SGallaher96	1 Replies 8 Views	Jul 26, 2018 by lucas dlamini
Organizations that set safety standards for manufactured ductwork include A) AHRI and HVAC ... Started by londonang	1 Replies 39 Views	Jul 26, 2018 by fur
What type of head do most sheet metal screw have? A) Pan head B) Hex head C) Round head D) ... Started by clmills979	3 Replies 86 Views	Jul 26, 2018 by quynhmickitran
A 5/16 in bolt with national course threads will have: A) 18 threads per inch. B) 16 threads per ... Started by Charlie	1 Replies 86 Views	Jul 26, 2018 by poopface
A 5/16 in bolt with national fine threads will have: A) 24 threads per inch. B) 20 threads per ... Started by joesmith1212	1 Replies 62 Views	Jul 26, 2018 by nmyers
Fiberboard duct is joined A) using the mechanically self-sealing joints formed on the end of the ... Started by chandani	1 Replies 26 Views	Jul 26, 2018 by nguyenhoanhat
Refrigerant quantities in air conditioning systems are often expressed in: A) Grains, grams, or ... Started by 2125004343	3 Replies 29 Views	Jul 26, 2018 by hugthug12
What are the two main types of duct cleaning equipment being used? A) Units that use high ... Started by azncindy619	1 Replies 29 Views	Jul 26, 2018 by qytan
The most common cause of airflow related problems in air conditioning units is: A) dirty air ... Started by ETearle	1 Replies 25 Views	Jul 26, 2018 by aruss1303
The area of a 20 inch by 24 inch filter is: A) 20 + 24 = 44 square inches. B) 24 - 20 = 4 square ... Started by karateprodigy	1 Replies 73 Views	Jul 26, 2018 by Hdosisshsbshs
If an air conditioning system is operating with an 80F return air temperature and a 50F supply air ... Started by bio_gurl	3 Replies 21 Views	Jul 26, 2018 by essyface1
A common cause of poor airflow is A) unusually large ductwork B) improper installation of the ... Started by tatyanajohnson	1 Replies 17 Views	Jul 26, 2018 by bdobbins
Which of the following is used to estimate the size of a room? A) Window frames B) Bricks C) Room ... Started by Ebrown	1 Replies 55 Views	Jul 26, 2018 by xthemafja
Matter cannot be created or destroyed but it can and does change forms; this statement is known as: ... Started by ss2343	1 Replies 15 Views	Jul 26, 2018 by shaquita
The state of matter with the highest energy level is: A) Solid. B) Gas. C) ... Started by lindiwe	3 Replies 36 Views	Jul 26, 2018 by nhea
Three general areas of problems in air conditioning systems include electrical problems, mechanical ... Started by burton19126	1 Replies 87 Views	Jul 26, 2018 by TheDev123
When an air cooled split system operates at low ambient temperatures A) The decreased air density ... Started by eruditmonkey@yahoo.com	1 Replies 14 Views	Jul 26, 2018 by phuda
When charging a capillary tube system that holds 100 ounces, the charge must be A) within 5, ... Started by jhjkgdfhk	1 Replies 31 Views	Jul 26, 2018 by morganmarie791
How is the subcooling of an air conditioning system affected by a low refrigerant charge? A) The ... Started by vicotolentino	3 Replies 62 Views	Jul 26, 2018 by nekcihc358
Gravity causes solids to exert force: A) Downward and to the sides. B) Downward. C) In all ... Started by dejastew	1 Replies 52 Views	Jul 26, 2018 by kjo;oj
Which form of matter has a definite volume, but takes the shape of its container? A) Solid B) ... Started by Capo	1 Replies 58 Views	Jul 26, 2018 by blazinlyss
Elements are: A) Pressure and temperature. B) Force and pressure. C) The forces of velocity ... Started by pane00	1 Replies 40 Views	Jul 26, 2018 by kingfahad97
A molecule is: A) Composed of photons and protons. B) Composed of protons and neutrinos. C) The ... Started by HCHenry	3 Replies 79 Views	Jul 26, 2018 by CAPTAINAMERICA