COSC 325 Houston (Mechanical) Exam Study Guide
Review Complete Questions And Answers Graded
A+
Enthalpy (h) - ✔✔ANSWER✔✔->>The total heat contained in a
substance measured from a baseline of 32 degrees farenheit
Where is relative humidity found on a psychometric chart? -
✔✔ANSWER✔✔->>the curving lines that run from the bottom left
side of the chart up to the right
forced air system - ✔✔ANSWER✔✔->>fuel heats air, which is
blown through ducts and vents; cool air is returned to the furnace to be
reheated
,Three must common types of furnaces - ✔✔ANSWER✔✔-
>>upflow, horizontal, and downflow (counterflow)
Upflow Furnace - ✔✔ANSWER✔✔->>return air is supplied at the
bottom of the unit and the heated air is delivered to the bonnet above
the furnace where it is distributed through ductwork
horizontal flow furnace - ✔✔ANSWER✔✔->>furnace in which
heated air flows horizontally as it leaves the furnace
Downflow Furnace - ✔✔ANSWER✔✔->>furnace is typ. located on
first floor and heated air is pushed down into ductwork located in a
crawl space or basement.
Blower - ✔✔ANSWER✔✔->>pump-like mechanism which
generates airflow
blowers used in forced-air systems - ✔✔ANSWER✔✔->>propeller,
centrifugal, axial
propeller blower - ✔✔ANSWER✔✔->>blades mounted on a
central bulb
, centrifugal blower - ✔✔ANSWER✔✔->>Consists of a scroll,
blower wheel, shaft, and inlet vanes
axial flow blower - ✔✔ANSWER✔✔->>-Consists of a blower wheel
that works like turbine wheel
-Used in medium to high pressure forced air heating systems
Static Pressure - ✔✔ANSWER✔✔->>pressure that acts through
weight only with no motion
heat exchanger - ✔✔ANSWER✔✔->>A device that transfers heat
from one substance to another without allowing substances to mix
(think radiator)
Low-efficiency filter - ✔✔ANSWER✔✔->>40% of large particulate
matter
Medium efficiency filter - ✔✔ANSWER✔✔->>40 to 80% of
common-size particulate matter
High-efficiency particulate air (HEPA) filters - ✔✔ANSWER✔✔-
>>80 to 90 % of small particulate matter
Review Complete Questions And Answers Graded
A+
Enthalpy (h) - ✔✔ANSWER✔✔->>The total heat contained in a
substance measured from a baseline of 32 degrees farenheit
Where is relative humidity found on a psychometric chart? -
✔✔ANSWER✔✔->>the curving lines that run from the bottom left
side of the chart up to the right
forced air system - ✔✔ANSWER✔✔->>fuel heats air, which is
blown through ducts and vents; cool air is returned to the furnace to be
reheated
,Three must common types of furnaces - ✔✔ANSWER✔✔-
>>upflow, horizontal, and downflow (counterflow)
Upflow Furnace - ✔✔ANSWER✔✔->>return air is supplied at the
bottom of the unit and the heated air is delivered to the bonnet above
the furnace where it is distributed through ductwork
horizontal flow furnace - ✔✔ANSWER✔✔->>furnace in which
heated air flows horizontally as it leaves the furnace
Downflow Furnace - ✔✔ANSWER✔✔->>furnace is typ. located on
first floor and heated air is pushed down into ductwork located in a
crawl space or basement.
Blower - ✔✔ANSWER✔✔->>pump-like mechanism which
generates airflow
blowers used in forced-air systems - ✔✔ANSWER✔✔->>propeller,
centrifugal, axial
propeller blower - ✔✔ANSWER✔✔->>blades mounted on a
central bulb
, centrifugal blower - ✔✔ANSWER✔✔->>Consists of a scroll,
blower wheel, shaft, and inlet vanes
axial flow blower - ✔✔ANSWER✔✔->>-Consists of a blower wheel
that works like turbine wheel
-Used in medium to high pressure forced air heating systems
Static Pressure - ✔✔ANSWER✔✔->>pressure that acts through
weight only with no motion
heat exchanger - ✔✔ANSWER✔✔->>A device that transfers heat
from one substance to another without allowing substances to mix
(think radiator)
Low-efficiency filter - ✔✔ANSWER✔✔->>40% of large particulate
matter
Medium efficiency filter - ✔✔ANSWER✔✔->>40 to 80% of
common-size particulate matter
High-efficiency particulate air (HEPA) filters - ✔✔ANSWER✔✔-
>>80 to 90 % of small particulate matter
