Skills and Trades

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Why does a heat pump need two metering devices? A) One metering device is used for first-stage ... Started by shenderson6	1 Replies 45 Views	Jul 24, 2018 by jharrington11
What effect do noncondensable gases have on system performance? A) They cause an increase in head ... Started by RRMR	3 Replies 47 Views	Jul 24, 2018 by xMRAZ
What effect do volatile liquids stored near the furnace have on its performance? A) They damage ... Started by drink	1 Replies 37 Views	Jul 24, 2018 by SAUXC
Why are thermostatic expansion valves often used as the outdoor metering device for the heating ... Started by kwoodring	1 Replies 49 Views	Jul 24, 2018 by okolip
The humidity sensor is used to adjust what components? A) The cooling coil face and bypass ... Started by segrsyd	1 Replies 30 Views	Jul 24, 2018 by elizabethrperez
What is the purpose of the Department of Energy's Building Technologies Program (BTP)? A) To ... Started by ss2343	3 Replies 38 Views	Jul 24, 2018 by joneynes
A process that moves horizontally from left to right across a psychrometric chart is: A) Changing ... Started by ss2343	1 Replies 20 Views	Jul 24, 2018 by ilianabrrr
What does the low-temperature thermostat do? A) When it senses air temperature below 35F, it ... Started by Tirant22	1 Replies 26 Views	Jul 24, 2018 by Laurenleakan
As a safety measure, when starting an LP gas furnace, you should position yourself: A) Directly ... Started by rmenurse	1 Replies 16 Views	Jul 24, 2018 by durant1234
How does the heating-cycle charge compensator differ during the heating and cooling cycles? A) ... Started by 809779	3 Replies 226 Views	Jul 24, 2018 by mmpiza
What visual clues on a system can indicate the presence of a refrigerant leak? A) A greenish ... Started by khang	1 Replies 68 Views	Jul 24, 2018 by joanwhite
What is the first step in the operational sequence? A) The draft switch closes. B) The burners ... Started by nautica902	1 Replies 73 Views	Jul 24, 2018 by Cheesycrackers
An example of sustainable site selection would be choosing to: A) Build on an existing building ... Started by rlane42	1 Replies 202 Views	Jul 24, 2018 by jennafosdick
Designing a heating and cooling system to accommodate load shifts: A) Improves efficiency. B) ... Started by james	3 Replies 36 Views	Jul 24, 2018 by Anton
What would the mixed air temperature be for a system with 20 outdoor air if the outdoor temperature ... Started by Shelles	1 Replies 39 Views	Jul 24, 2018 by ririgirl15
What do air-quality sensors measure? A) Temperature, velocity, and pressure B) CO2, enthalpy, and ... Started by jho37	1 Replies 21 Views	Jul 24, 2018 by katieost
If a technician wanted to accurately measure static pressure in a duct system, how would she place ... Started by penza	1 Replies 28 Views	Jul 24, 2018 by jliusyl
What are differential enthalpy sensors used to control? A) The economizer B) The steam grid C) ... Started by fox	3 Replies 21 Views	Jul 24, 2018 by ong527
An example of a sustainable design for water control would be: A) Using a large retention pond to ... Started by tuffie	1 Replies 25 Views	Jul 24, 2018 by kxciann
Variable refrigerant flow systems use: A) Inverter driven systems and electronic expansion ... Started by burchfield96	1 Replies 42 Views	Jul 24, 2018 by lorealeza
When is the igniter energized on an induced draft furnace that uses hot surface ignition? A) At ... Started by NguyenJ	1 Replies 36 Views	Jul 24, 2018 by cupcake16
An undersized valve may cause: A) Hunting. B) Trickling. C) Cavitation. D) ... Started by michelleunicorn	3 Replies 109 Views	Jul 24, 2018 by vickyvicksss
An example of energy-saving design would be: A) Using several smaller incandescent fixtures ... Started by jlmhmf	1 Replies 11 Views	Jul 24, 2018 by helenmarkerine
What is the airflow through a 2 ft by 3 ft hole if the air velocity is 100 ft per minute? A) 100 ... Started by ahriuashd	1 Replies 61 Views	Jul 24, 2018 by Animal_Goddess
The design pressure drop across the valve is measured when the valve is: A) Fully closed. B) ... Started by Pea0909berry	1 Replies 25 Views	Jul 24, 2018 by bassamabas