Study Guide For Hvac Exam
Welcome to HVAC Certification Practice Tests website This website contains of HVAC Certification practice exam questions and answers. This is the only free online HVAC prep website helps in preparing for ( Environmental Protection Agency) EPA 608, NATE (North American Technician Excellence), ICE (Industry Competency Exam) and many HVAC license exams. This website was built in order to help and provide free resources for the students and technicians preparing license exams in HVAC domain. This website consists of hundreds of free simulated exams.
All the exams are of high quality and was prepared by team of professionals. Most of the test questions are picked from previous certificate exams.
These hvac practice tests are one of the most effective tools for license exam preparation. Some of the exam topics includes Air conditioning and Refrigeration, HVAC Controls, Psychometrics, epa 608 practice tests, NATE and many other. All the test topics consist of about 15 to 20 multiple choice questions (MCQs) with no time limit. This will certainly helps students, hvac technicians and professionals taking up licensing exams or helps in testing knowledge in HVAC domain. Please go through the site and enjoy the free practice exams. All the Best!
WHAT YOU WILL LEARN WITH OUR GUIDE. Mechanical Code - What to highlight and how to calculate ventilation and combustion air requirements, hood sizes and return air ducts, plus more. Fuel Gas Code - What to highlight. Determining confined spaces, gas pipe sizes, vent sizes and clearances, plus more. Manual J, 8th edition- Easy to understand procedures for calculating loads.
Basic principles of heat transfer and thermodynamics. Operating cost calculations. Manual N- Once we get through Manual J, N will be a cakewalk. Manual D- 'Three easy steps to duct sizing.' .
Symbols and Psychrometrics - How to read and use charts and calculate A/C capacity. Business- Learn business equations and accounting principles.
Find out how to figure profit the correct way. Energy Code - Only what you need to know to pass. 150 Strategic Practice Questions - Answer these and you'll surely pass. Much, much more. Below Is a sample of what you may encounter on the exam. Where the minimum size combustion air duct is 6” X 12”, a metal lover with unknown free area must be at least square inches 2. Calculate the required outdoor ventilation rate for a 1700 sq.
Office space? When installing B- vent for a 120,000 BTUH gas furnace (fan assisted), what is the minimum diameter if the vent is 12 feet high with a 2 foot lateral? Calculate the velocity (FPM) of 800 CFM in an 8' x 14' duct.
If R- 19 insulation is added to a 1200 square foot ceiling with a U- value of.05, what is the new R- value? New U- value? Heat loss at 50 degree temperature difference? If you purchase an appliance for $1000 and wish to make 30% profit; what would your selling price be? Students who have used this guide book have a higher passing rate than students who take a classroom course.
Because people who READ the material retain much more than people whom are TOLD the material, and the Guide is always next to them as a reference to refer to later. We make learning easy Once you've read our sections on load calculations and duct design you'll be looking for a butt kicking machine for not ordering our course earlier. There is simply no easier method for fully understanding these manuals. Because many states are now adding business questions to their HVAC exams, we have included a section on business practices and math. It is written in a language, we in the trade understand. You no longer have to have the skills of a Philadelphia lawyer, mathematician and a CPA to help prepare for the exam.
R- Value This is a number indicating the ability of a substance to resist the flow of heat. The higher the R value, the better it acts as an insulator. Typical R- values of building components can be found in Manual J or go to: values.htm for a free listing of R- values. U value (Learn and understand U value.
It is the foundation of a load calculation.) The U value is the number of BTUs that pass though one square foot of substance in one hour’s time when there is one degree temperature difference. The U value is the reciprocal. of the R value. A U- value can to said to be the rate of conduction U=1/R.A reciprocal of a number is 1 divided by the number. The reciprocal of 20 is 1/20 or.05. Suppose you had a six- inch thick, R- 19 fiberglass insulation batt, and you wanted to know how much heat will pass through it. First, determine the U value.
U= 1/R U= 1/19 U=.0526 Therefore,.0526 BTUs pass through 1 square foot of the batt each hour when there is one degree temperature difference. If the batt measured 2’ x 8’ we would have a total area of 16 sq.
Study Guide For Hvac Certification
We could then say that.8414 BTUs (16 sq. X.0526 BTUs). Pass through the entire batt in one hour when there is one degree temperature difference. Carrying our example just one step further, if the temperature on one side of the batt is 20 degrees and on the other side it is 70 degrees, then we would have a 50- degree temperature difference (70–20). Therefore, 42.08 BTU's (.8414 BTU's x 50 degrees) would pass through the batt in one hour.
Study Guide For Hvac Exam
Simply stated, use the following formula to determine the amount of heat gained or lost through any substance: BTUH = U x TD X AREA =.0526 x 50 X 16' = 42.08 Once you know the U value, the square footage and the temperature difference, you can calculate the BTU heat loss or gain per hour through a substance. However, walls, floors and ceilings are not made up of just insulation. A wall may be made up of brick, sheathing, insulation and sheetrock, each of which has its own R value. The R value of each component must be added together to obtain the total R value.
Then we simply take the reciprocal (1/R) and get the total U value of the wall. For a list of R- values, locate a table titled ' R Values of Common Building Materials' in Manual J8, or go to: values.htm. Single appliance - Table 504.2(1) Sizing vents What size B vent is needed for a 160,000 BTUH, naturally ventilated appliance if the total vent height is 18’ and the lateral 2’? Under the height column you have to choose either 15’ or 20’.
Study Guide For Hvac Contractor License
Remember this. The taller the vent the more capacity it has, therefore, if the 20’ row is used the vent may be under sized. Always use the shorter height.
In this case use 15’. Now use the 2’ lateral and select a vent size under NAT. A 5” vent will handle only 150,000 BTUH, while a 6” vent will handle 225,000 BTUH, therefore select a 6” vent.
About your instructor John White has been teaching plumbing and mechanical for over 40 years. He has a BSBA degree in Business Administration, holds an electrical, plumbing and HVAC licenses. He has taught at both, universities and community colleges, has presented seminars throughout the nation and has even created licensing exams like the one you are about to take. John’s son took over his mechanical contracting business in 2006, allowing him to devote his energy to his consulting company, Energy Marketing Services, which develops and conducts plumbing and HVAC exam prep courses and is also an approved provider of continuing education.