Hvac Study guides, Class notes & Summaries
Looking for the best study guides, study notes and summaries about Hvac? On this page you'll find 528 study documents about Hvac.
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HVAC Contractor prep Test 2 Questions & 100% Verified Answers | Latest Update | Already Graded A+
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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 re...
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AC Review HVAC Questions & 100% Verified Answers | Latest Update | Already Graded A+
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Heat which causes a change in temperature of a substance is called; 
: Sensible Heat. 
heat added to substance without a rise in temperature; (example: liquid refrigerant to 
gas) this process is called? 
: Latent heat of vaporization. 
Heat added to the refrigerant in a vapor state after the evaporation process is called; 
: Superheat. 
A scroll compressor move refrigerant by means of; 
: Involute Spirals. 
The movement of heat by way of fluid (or air) is called; 
: Convection. 
The movement o...
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HVAC NATE Gas Heat Exam Prep (Latest 2024/ 2025 Update) 100% Correct Questions and Verified Answers| Grade A
- Exam (elaborations) • 33 pages • 2024
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HVAC NATE Gas Heat Exam Prep (Latest 2024/ 2025 Update) 100% Correct Questions and Verified Answers| Grade A 
 
 
Q: When starting up a dual system, the temperature rise method for determining airflow cannot be used with compressor cycle of the heat pump because: 
 
 
Answer: 
The capacity of the system varies too much with outdoor temperature. 
 
 
 
Q: The flame pattern a technician would expect to see on a properly operating single stage gas furnace equipped with "in shot" type burner is a:...
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HVAC NATE Heat Pump Exam (Latest 2024/ 2025 Update) 100% Correct Questions and Verified Answers| Grade A
- Exam (elaborations) • 35 pages • 2024
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HVAC NATE Heat Pump Exam (Latest 2024/ 2025 Update) 100% Correct Questions and Verified Answers| Grade A 
 
Q: What is the absolute pressure at sea level if a gauge pressure is 35 psig? 
 
 
Answer: 
 49.7psia 
 
 
 
Q: 100,000 BTUH output furnace. 
Return air temp is 65F. 
Supply air is 135F. 
What is the CFM? 
 
 
Answer: 
 1323CFM 
 
 
 
Q: What is the best method of repair when a residential supply diffuser is noisy because of a loose vane? 
 
 
Answer: 
 Replace the diffuser. 
 
 
 
Q: When...
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HVAC Gas Heat Certification Exam Prep (Latest 2024/ 2025 Update) 100% Correct Questions and Verified Answers| Grade A
- Exam (elaborations) • 26 pages • 2024
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HVAC Gas Heat Certification Exam Prep (Latest 2024/ 2025 Update) 100% Correct Questions and Verified Answers| Grade A 
 
 
Q: Why is excess air supplied to all gas-burning appliance burners? 
 
 
Answer: 
 to ensure that there is enough air all all times. 
 
 
 
Q: The purpose of a gas regulator at a gas burning appliance is to? 
 
 
Answer: 
 B. decreases the pressure to the burner 
 
 
 
Q: Ture or False: All gas valves snap open and closed. 
 
 
Answer: 
 False 
 
 
 
Q: Which of the followin...
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HVAC Gas Heat Exam (Latest 2024/ 2025 Update) 100% Correct Questions and Verified Answers| Grade A
- Exam (elaborations) • 25 pages • 2024
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HVAC Gas Heat Exam (Latest 2024/ 2025 Update) 100% Correct Questions and Verified Answers| Grade A 
 
Q: Why is specific gravity of a gas important? 
 
 
Answer: 
It affects the gas flow through the piping and through the orifice of the furnace. 
 
 
 
Q: What is an orifice and a spud? 
 
 
Answer: 
An orifice is a precisely sized hole in a gas fitting which gas flows from the manifold to the burners. 
A spud is another name for a gas fitting. 
 
 
 
Q: If both a light gas and a heavy gas are at...
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HVAC Gas Heat Certification Exam (Latest 2024/ 2025 Update) 100% Correct Questions and Verified Answers| Grade A
- Exam (elaborations) • 20 pages • 2024
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HVAC Gas Heat Certification Exam (Latest 2024/ 2025 Update) 100% Correct Questions and Verified Answers| Grade A 
 
Q: What is the volume of flue gas produced from a 60,000 BTU/h Category I fan assisted Natural Gas furnace operating with 50% excess air? 
 
 
Answer: 
600 cu ft. 
 
 
 
Q: The purpose of a flue baffle is to 
 
 
Answer: 
Increase heat exchange 
 
 
 
Q: The LP gas pressure supplied to the appliance gas valve should be 
 
 
Answer: 
11 - 13 in. W.C. 
 
 
 
Q: An installed gas furna...
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HVAC Electrical Test
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HVAC Electrical Test
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HVAC Electrical Final Test
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HVAC Electrical Final Test
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Electric Heat ESCO - HVAC Excellence Exam
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Electric Heat ESCO - HVAC Excellence Exam