ARE PPD Exam 2025 Questions & Answers Solved
100% Correct.
what are the most common types of forced-air systems?
single duct/constant air volume, high velocity dual duct, multizone, variable air volume, variable
refrigerant flow, unitary
which forced-air system is most commonly used in residential homes?
single duct/constant air volume
which forced-air system can provide simultaneous heating and cooling?
dual duct
which forced-air system is commonly used in large buildings with multiple tenants?
variable air volume
what are interstitial spaces?
space between floors used for mechanical, plumbing, and electrical systems; useful for when
system needs change often like in hospitals and laboratories
which forced-air system is used in medium-sized buildings like malls?
multizone
what are 2 advantages of a high-velocity dual duct system?
simultaneous heating and cooling, smaller duct sizes
what are 2 disadvantages of a high-velocity dual duct system?
, expensive to install, inefficient use of energy
which HVAC system is used in spaces where return air cannot be used?
air-water induction
what are 2 advantages of an all-water system?
simultaneous heating and cooling, no ductwork
what is a disadvantage of an all-water system?
no humidity control
which HVAC system is a combination of an all-water system and a constant air volume
system?
fan coil
which HVAC system is used in buildings with varying needs and zones?
variable refrigerant flow
which efficiency method is basically the equivalent of opening a window?
economizer cycle
what is a requirement for displacement ventilation?
access floor system/interstitial space
which efficiency method is ideal for climates where the temperature differential is high?
energy recovery ventilator
what does an energy recovery ventilator do?
100% Correct.
what are the most common types of forced-air systems?
single duct/constant air volume, high velocity dual duct, multizone, variable air volume, variable
refrigerant flow, unitary
which forced-air system is most commonly used in residential homes?
single duct/constant air volume
which forced-air system can provide simultaneous heating and cooling?
dual duct
which forced-air system is commonly used in large buildings with multiple tenants?
variable air volume
what are interstitial spaces?
space between floors used for mechanical, plumbing, and electrical systems; useful for when
system needs change often like in hospitals and laboratories
which forced-air system is used in medium-sized buildings like malls?
multizone
what are 2 advantages of a high-velocity dual duct system?
simultaneous heating and cooling, smaller duct sizes
what are 2 disadvantages of a high-velocity dual duct system?
, expensive to install, inefficient use of energy
which HVAC system is used in spaces where return air cannot be used?
air-water induction
what are 2 advantages of an all-water system?
simultaneous heating and cooling, no ductwork
what is a disadvantage of an all-water system?
no humidity control
which HVAC system is a combination of an all-water system and a constant air volume
system?
fan coil
which HVAC system is used in buildings with varying needs and zones?
variable refrigerant flow
which efficiency method is basically the equivalent of opening a window?
economizer cycle
what is a requirement for displacement ventilation?
access floor system/interstitial space
which efficiency method is ideal for climates where the temperature differential is high?
energy recovery ventilator
what does an energy recovery ventilator do?
