EXAM 1 HVAC DESIGN TEST
QUESTIONS WITH GUARANTEED PASS
SOLUTIONS.
To calculate the heat loss through an opaque wall at any given time generally requires which of the
following
information sets:
(a) wall area and U-factor, and the temperature difference across the wall
(b) wall thickness and area, and the date and time of day
(c) wall area, resistance and emittance, and the fenestration heating rating (FHR)
(d) wall area and U-factor, and the solar heat gain coefficient - Answer (a) wall area and U-factor, and
the temperature difference across the wall
U-factor (the overall coefficient of thermal transmission) is calculated by which of the following
equations:
(a) U = (R1 + R2 + R3 + ...)
(b) U = (R1 + R2 + R3 + ...) / 1
(c) U = 1 / (R1 + R2 + R3 + ...)
(d) U = (R1) (R2) (R3) (...) - Answer (c) U = 1 / (R1 + R2 + R3 + ...)
Water vapor will always flow through the building envelope:
(a) from lower to higher elevations
(b) from colder to warmer temperatures
(c) from inside to outside
(d) from higher vapor pressure to lower vapor pressure - Answer (d) from higher vapor pressure to
lower vapor pressure
The primary difference between sensible and latent heat is:
(a) sensible heat affects dry-bulb temperature, while latent heat affects moisture content
, (b) sensible heat occurs in winter and latent heat occurs in summer
(c) sensible heat can be handled by building systems, while latent heat can not
(d) sensible heat will flow within a building, while latent heat is stationary - Answer (a) sensible heat
affects dry-bulb temperature, while latent heat affects moisture content
The acronym "HVAC" stands for:
(a) heating, ventilating, air moving, and cooling
(b) heating, ventilating, air quality control, and cooling
(c) heating, ventilating, and air-conditioning
(d) heating, ventilation, and air-control - Answer (c) heating, ventilating, and air-conditioning
Advantages of a "local" HVAC system over a "central" system would typically include:
(a) more individual control, smaller equipment units, potential for building conditioning should a single
unit fail, no need for a mechanical room
(b) better comfort environment, higher efficiency, more architecturally appealing
(c) no space required for equipment, quiet equipment, easy use of centralized controls
(d) no need for sizing calculations or engineering consultants, hidden equipment - Answer (a) more
individual control, smaller equipment units, potential for building conditioning should a single unit fail,
no need for a mechanical room
The concept of "distribution tree" in HVAC design is used to describe:
(a) the network of sales and delivery locations established to provide HVAC equipment
(b) the flow of design information from architect to consultant to contractor
(c) the continuous flow and cycling of refrigerant in a mechanical cooling system
(d) the means by which cooling and heating are delivered from a central system to conditioned spaces -
Answer (d) the means by which cooling and heating are delivered from a central system to conditioned
spaces
The primary components of a compressive refrigeration cycle include:
(a) evaporator, condenser, compressor, expansion valve
(b) generator, compressor, condenser, absorber
QUESTIONS WITH GUARANTEED PASS
SOLUTIONS.
To calculate the heat loss through an opaque wall at any given time generally requires which of the
following
information sets:
(a) wall area and U-factor, and the temperature difference across the wall
(b) wall thickness and area, and the date and time of day
(c) wall area, resistance and emittance, and the fenestration heating rating (FHR)
(d) wall area and U-factor, and the solar heat gain coefficient - Answer (a) wall area and U-factor, and
the temperature difference across the wall
U-factor (the overall coefficient of thermal transmission) is calculated by which of the following
equations:
(a) U = (R1 + R2 + R3 + ...)
(b) U = (R1 + R2 + R3 + ...) / 1
(c) U = 1 / (R1 + R2 + R3 + ...)
(d) U = (R1) (R2) (R3) (...) - Answer (c) U = 1 / (R1 + R2 + R3 + ...)
Water vapor will always flow through the building envelope:
(a) from lower to higher elevations
(b) from colder to warmer temperatures
(c) from inside to outside
(d) from higher vapor pressure to lower vapor pressure - Answer (d) from higher vapor pressure to
lower vapor pressure
The primary difference between sensible and latent heat is:
(a) sensible heat affects dry-bulb temperature, while latent heat affects moisture content
, (b) sensible heat occurs in winter and latent heat occurs in summer
(c) sensible heat can be handled by building systems, while latent heat can not
(d) sensible heat will flow within a building, while latent heat is stationary - Answer (a) sensible heat
affects dry-bulb temperature, while latent heat affects moisture content
The acronym "HVAC" stands for:
(a) heating, ventilating, air moving, and cooling
(b) heating, ventilating, air quality control, and cooling
(c) heating, ventilating, and air-conditioning
(d) heating, ventilation, and air-control - Answer (c) heating, ventilating, and air-conditioning
Advantages of a "local" HVAC system over a "central" system would typically include:
(a) more individual control, smaller equipment units, potential for building conditioning should a single
unit fail, no need for a mechanical room
(b) better comfort environment, higher efficiency, more architecturally appealing
(c) no space required for equipment, quiet equipment, easy use of centralized controls
(d) no need for sizing calculations or engineering consultants, hidden equipment - Answer (a) more
individual control, smaller equipment units, potential for building conditioning should a single unit fail,
no need for a mechanical room
The concept of "distribution tree" in HVAC design is used to describe:
(a) the network of sales and delivery locations established to provide HVAC equipment
(b) the flow of design information from architect to consultant to contractor
(c) the continuous flow and cycling of refrigerant in a mechanical cooling system
(d) the means by which cooling and heating are delivered from a central system to conditioned spaces -
Answer (d) the means by which cooling and heating are delivered from a central system to conditioned
spaces
The primary components of a compressive refrigeration cycle include:
(a) evaporator, condenser, compressor, expansion valve
(b) generator, compressor, condenser, absorber
