4-8. A gravity warm-air heating system must be installed in a basement for which of the following reasons? 1. To allow warm air to be blown upward by fans 2. To hide unsightly ductwork 3. To allow heated air to rise through  the  ductwork  into  the areas  reguiring  heat 4. To  provide  the  necessary  floor space  for  the  large-size furnace 4-9. What type of heating system is most often used for heating large industrial  shops? 1. Forced-air  furnace 2. Unit  heaters 3. Steam 4. Hot water 4-10. What type of heating system is designed to compensate for the loss of body heat to surrounding surfaces? 1. Forced-air  furnace 2. Steam 3. Hot water 4. Radiant 4-11. Which of the following conditions apply to the term comfort conditioning? 1. Controlled  room  temperature 2. Controlled  humidity 3. Controlled  air  quality  and motion 4. All of the above 4-12. In  addition  to  cooling,  a  secondary effect  that  you  achieve  with mechanical  refrigeration  is  higher humidity. 4-13. What part of a window air- conditioning  unit  changes  the liquid  refrigerant  to  a  low- pressure  gas? 1. Condenser 2. Condenser  coils 3. Evaporator 4. Evaporator  coils 4-14. Which  of  the  following  descriptions best describes a heat pump? 1. A  self-contained air-conditioning  unit  that  you can use for both cooling and heating 2. A device that is built into a window air conditioner that pumps  the  high-temperature refrigerant gas to the condenser 3. A built-in pump that blows heated air into a room from a self-contained    air-conditioning unit 4. A  control  device  that  regulates the  flow  of  liquid  refrigerant to the evaporator coils 4-15. What  publication  provides information  on  the  standard mechanical  symbols  used  for preparing  HVAC  drawings? 1. MIL-HDBK-1006/1 2. MIL-STD-17B 3. MIL-STD-14A 4. MIL-STD-100E Learning  Objective:  Describe  the various  attributes  that  you  should look for when checking and editing project  drawings. 1. True 2. False 22