InterNachi HVAC Material Exam Questions and Answers 100% Pass

InterNachi HVAC Material Exam Questions and Answers 100% Pass A heat source capable of maintaining at least __________ should serve every habitable space in houses in almost all regions. - ANSWER-68F Burning natural gas creates _______________. - ANSWER-Water vapor and carbon dioxide Burning natural gas with Oxygen yields CO2, water vapor and _______. - ANSWER- Heat As hot gases cool, they release a lot of heat energy as the change their state from __________. - ANSWER-Gas to a liquid If combustion air is inadequately supplied to a gas furnace, ___________ will be produced. - ANSWER-Carbon Monoxide * You must add enough O2 to the Reaction to get CO2 in its products. ____________ is what carries the heat from the source to the enclosure being heated - ANSWER-Heat conveying medium Copyright ©SOPHIABENNETT 2025 ACADEMIC YEARALL RIGHTS RESERVED. Page 2/17 You may be able to describe a heating system by its _________. - ANSWER-Heat conveying medium _________________ and baseboard convectors are considered heat-emitting components. - ANSWER-Radiators List the two categories to describe furnace heating systems: - ANSWER-1. Gravity Warm Air Furnaces 2. Forced Warm Air Furnaces A warm-air heating system costs ________ to install than a hot-water or steam-heating system. - ANSWER-Less A hot-water or steam-heating system costs _________ than a warm-air heating system. - ANSWER-More Steady-state efficiency measures how efficiently a furnace ______________. - ANSWER-Converts fuel to heat * How much usable heat is created when a furnace is running* The efficiency of the air circulation in a house with gravity warm-air heating system depends on ______________. - ANSWER-The temperature difference between 1. The warm air rising 2. The cool air falling Copyright ©SOPHIABENNETT 2025 ACADEMIC YEARALL RIGHTS RESERVED. Page 3/17 The heat from a warm-air heating system is distributed throughout the home either by gravity or ______________. - ANSWER-The use of a circulating/blower fan The warm air in gravity warm-air heating system rises up through warm-air ducts or pipes are also known as. - ANSWER-Stacks A stack relay senses __________ instead of _____________. - ANSWER-Heat......light The first step in the operation of a warm-air heating system is ___________________. - ANSWER-Circulating fan draws air into the furnace If a fan is used to distribute the air from a warm-air heating system, it's more properly known as a ______________. - ANSWER-Forced warm-air heating system. In a forced warm-air heating system, the cool air ________________. - ANSWER- Returns through the ducts and back to the furnace, where it is reheated. The direction or arrangement of the furnace's air flow should not _____________. - ANSWER-1. Significantly affect your inspection 2. Significantly affect its operation A(n) ____________ furnace is also referred to as a counter-flow furnace or a down draft furnace - ANSWER-Downflow In a conventional gas furnace with a natural draft, the air that is mixed with the gas initially for combustion is called the _____________. - ANSWER-Primary Air Copyright ©SOPHIABENNETT 2025 ACADEMIC YEARALL RIGHTS RESERVED. Page 4/17 _____________ air is the air that mixes with the gas before going to the burners. - ANSWER-Primary Primary air is ________ a combustion chamber - ANSWER-Drawn inside The secondary air is the air ______________ a combustion chamber - ANSWER- Around the air inside (Primary air is the drawn in There are ________ types of heat-conveying mediums. - ANSWER-4 (Air, Water, Steam, Electricity) According to modern standards, air-conditioning condensing units and heat pump units should have a readily accessible electrical disco