HVAC Contractor prep Test 2 Questions & 100% Verified Answers | Latest Update | Already Graded A+

1 | P a g e HV AC Contractor prep Test 2 Questions & 100% Verified Answers | Latest Update | Already Graded A+ The International Mechanical Code considers a "flammable Vapor" to be concentration of flammable constituents in the air which exceeds _____________ percent of its flammability limit. 🗸🗸🗸 : 25% During installation or service of electrical controls, a digital multimeter set to voltage must be connected in what manner? 🗸🗸🗸 : In parallell Unvented fuel -burning room heaters are NOT permitted in a Group ___________ occupancy? 🗸🗸🗸 : A According to the Code, smoke detectors shall be installed in return air system with a design capacity of at least HOW MANY cubic fe et per minute of air flow in the duct, plenum, filters, air connections, or decontamination equipment and appliances? 🗸🗸🗸 : 2,000 CFM 2 | P a g e If a system is using 12" round steel duct, what would be the air velocity measurement expressed in feet per minute (f pm) given that the air traveling through the duct is a velocity of 600 CFM? 🗸🗸🗸 : 763 fpm Given that an 80,000 Btu/h gas furnace will have the combustion air supplied from a mechanical air supply system outdoor source, the combustion air in shall be a t least _________ Cubic Feet per Minute ventilation? 🗸🗸🗸 : 28 cfpm Texas Department of License and Regulation requires that a contractor give company contact information update if there are any changes as soon as possible. This notification must be wi thin how many days? 🗸🗸🗸 : 30 days Where the drain pipes from more than one unit manifolded together for condensate drainage, the pipe or tubing shall be sized according to the equipment capacity. What would be the minimum size if the requirement was 6 5 tons of refrigerant? 🗸🗸🗸 : 1-1/4 in Where equipment replacements and repairs are required to be performed in an emergency situation, the permit application shall be submitted within _________ to the department of inspection. 3 | P a g e 🗸🗸🗸 : Next working d ay All refrigerant piping installations that contain more than 6.6 lb of a refrigerant in systems using positive -displacement compressors shall NOT have stop valves installed at the ___________? 🗸🗸🗸 : Inlet of each receiver What characteristic establishes the classification of industrial heating equipment for the purpose of determining if it is a low, medium, or high -heat Appliance? 🗸🗸🗸 : The temperature of the combustion gases at the equipment flue Outlet According to t he Texas contractor's business reference manual which of the following listed below does not require the license number of the contractor? 🗸🗸🗸 : Printed material, newspaper ads, yellow page ads, business cards Riser ducts shall be held in place by mea ns of metal straps or angles and channels to secure the riser to the structure. What would be the maximum horizontal spacing of straps if the duct was rectangular with a max side dimension of 30in 🗸🗸🗸 : On 10' centers According to the textbook modern refrigeration and air -conditioning, the location in position of a TXV sensing bulb on the suction line depends on the tubing size, therefore,