Ohio Contractors License Exams

Ohio HVAC Contractor

Sample Questions for the Ohio HVAC Contractors Exam

  1. What is a sling psychrometer used for?
    1. Measuring dew point
    2. Determining relative humidity through the relation of wet bulb temperature to dry bulb temperature
    3. Checking the performance of air conditioning equipment
    4. To balance a heating/cooling split system
  2. The nature of air pollutants and their effect on health can be separated into three groups that have related characteristics. What are they?
    1. Allergens, pathogens, and asbestos fibers
    2. Radon, volatile organic compounds (VOCs), and combustion products
    3. Volatile organic compounds (VOCs), Bioaerosols, and environmental tobacco smoke
    4. Particles, vapors and gases, and combination particles/vapors
  3. What is the composition of air?
    1. 21% oxygen, 78% nitrogen, and 1% carbon dioxide, argon, and trace amounts of other rare gases, vapor, and particulates
    2. 50% oxygen, 30% nitrogen, and 10% carbon monoxide, and 10% other rare gases and particulates
    3. 30% oxygen, 20% nitrogen, and the remaining 50% is composed of carbon dioxide and other gases, vapors, and particulates
    4. 21% oxygen, 78% nitrogen, and 1% carbon dioxide
  4. In a heating and/or cooling system, what is the accessory used to supply and control the introduction of outside air and to exhaust stale air?
    1. The humidistat
    2. The HEPA filter
    3. The energy recovery ventilator (ERV)
    4. The indoor air quality equalizer
  5. In a heating/cooling system, where should the filter be placed?
    1. Ahead of heating and cooling coils and other mechanical equipment
    2. Between the heating and cooling cools
    3. In the HVAC room next to the furnace
    4. On the side of the return air plenum
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