Skills and Trades

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Using the CFM per 100 sq ft method, a 1,600 sq ft house leaking 120 CFM has a leakage rate of: A) ... Started by panfilo	1 Replies 4 Views	Jul 24, 2018 by sarah_brady415
What code restrictions can prevent using an open-loop geothermal system? A) Some states have bans ... Started by CORALGRILL2014	1 Replies 65 Views	Jul 24, 2018 by tjayeee
What is done when an HVACR system is commissioned? A) The system is checked to make sure it is ... Started by Mimi	3 Replies 84 Views	Jul 24, 2018 by chereeb
How does heat capacity correlate with outdoor temperature on a balance point graph? A) As outdoor ... Started by jparksx	1 Replies 65 Views	Jul 24, 2018 by Briannahope
How does an oil acid test kit indicate the presence of acid? A) By a color change B) The word ... Started by Kthamas	1 Replies 69 Views	Jul 24, 2018 by Bsand8
A high temperature differential (more than 2 degrees) between return air temperature at the grille ... Started by Redwolflake15	1 Replies 99 Views	Jul 24, 2018 by steff9894
The balance point of an air-source heat pump is the temperature at which: A) The heat pump ... Started by azncindy619	3 Replies 89 Views	Jul 24, 2018 by strudel15
What types of appliances may oil furnaces be common vented with? A) Oil furnaces may not be ... Started by panfilo	1 Replies 95 Views	Jul 24, 2018 by Jossy
What information is necessary to determine a system balance point? A) A heat load calculation and ... Started by lidoalex	1 Replies 106 Views	Jul 24, 2018 by chloejackso
If you try to remove tubing before all the brazing material is molten, the tubing will: A) Not ... Started by tfester	1 Replies 124 Views	Jul 24, 2018 by peilian
To ensure correct operation, how often should the nozzle be replaced? A) Every year B) Every 18 ... Started by EY67	3 Replies 91 Views	Jul 24, 2018 by dellikani2015
Most hot water boilers heat the water up to temperatures of: A) 200F to 250F. B) 100F to 150F. C) ... Started by vicotolentino	1 Replies 46 Views	Jul 24, 2018 by Toya9913
A tachometer is used to measure: A) Energy use. B) Air velocity. C) Wind speed. D) Rotational ... Started by dbose	1 Replies 19 Views	Jul 24, 2018 by blakcmamba
If the pump cutoff is working properly, the output pressure should not drop past what percentage ... Started by jake	1 Replies 179 Views	Jul 24, 2018 by jonathanballen97
Radiant floor heating systems typically operate at temperatures of: A) 180F to 200F. B) 85F to ... Started by CharlieWard	3 Replies 29 Views	Jul 24, 2018 by Hikerman221
The burner motor runs, but the oil pump does not produce pressure. This can be caused by: A) A ... Started by BRWH	1 Replies 22 Views	Jul 24, 2018 by essyface1
What is indicated by a frothy stream of oil in the oil supply line? A) Water in the oil tank B) ... Started by lunatika	1 Replies 82 Views	Jul 24, 2018 by prumorgan
What is the minimum desired return water temperature for a gas-fired boiler? A) At least 100F ... Started by codyclark	1 Replies 30 Views	Jul 24, 2018 by wergv
If an electrical load in a split-system air conditioner is not working, the technician must ... Started by renzo156	3 Replies 24 Views	Jul 24, 2018 by joewallace
What can cause the burner motor to not start? A) A locked oil pump B) Either a locked oil pump ... Started by Wadzanai	1 Replies 118 Views	Jul 24, 2018 by kjo;oj
Why is it desirable to have a minimum water temperature entering the boiler? A) To increase ... Started by magmichele12	1 Replies 42 Views	Jul 24, 2018 by pallen55
A pitot tube is used to measure: A) Barometric pressure in mechanical rooms. B) Velocity pressure ... Started by crazycityslicker	1 Replies 61 Views	Jul 24, 2018 by raenoj
The amount of moisture in the air can be measured with: A) An electronic hygrometer. B) A hot ... Started by student77	3 Replies 16 Views	Jul 24, 2018 by efwsefaw
What is a pickling solution? A) A corrosion inhibitor used on steel pipes B) The circulating ... Started by Capo	1 Replies 18 Views	Jul 24, 2018 by onowka
The most common airflow problem experienced on air-conditioning systems is: A) Low airflow caused ... Started by Pineapplelove6	1 Replies 48 Views	Jul 24, 2018 by Meganchabluk