COSC 325 HOUSTON LATEST
(MECHANICAL) EXAM
What evaporating medium do forced-air systems use? - ANSWERS-air
What are the components of a forced-air system? - ANSWERS-Air
conditioner, blower, supply and return ductwork, registers, grills, and
controls
What type of blowers are used in air conditioning systems? -
ANSWERS-centrifugal
Where are registers located? - ANSWERS-on the supply branches
Where are grills located? - ANSWERS-on the return air ductwork
When are hydronic systems commonly used? - ANSWERS-in a situation
where air conditioning equipment is located centrally and building
spaces are located remotely. Ex: school buildings
heat pump - ANSWERS-A mechanical device which uses compression
and decompression of gas to heat and/or cool a house.
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PAGE
1
, COSC 325 HOUSTON LATEST
(MECHANICAL) EXAM
Reversing valve - ANSWERS-four-way directional valve that reverses
the flow of refrigerant through a heat pump. It consists of a piston and
cylinder that have four refrigerant line connections.
Auxiliary heat - ANSWERS-the extra heat provided by a conventional
heating system for periods of cloudiness or intense cold when a solar
heating system cannot provide enough
defrost cycle - ANSWERS-A cycle of operation of a heat pump that is
designed to defrost the outside coil during the heating operation
Building automation system - ANSWERS-control of the energy and
resource using devices in a building for optimization
DDC - ANSWERS-Direct Digital Control
Sensor - ANSWERS-A device that responds to a physical stimulus (as
heat, light, sound, pressure, magnetism, or a particular motion) and
transmits a resulting impulse (as for measurement or operating a
control).
END OF
PAGE
2
, COSC 325 HOUSTON LATEST
(MECHANICAL) EXAM
Controller - ANSWERS-a device that makes decisions to change some
aspect of a system based on sensor information and internal
programming
Actuator - ANSWERS-A device to produce physical movement based
on output from a computer system.
protocol - ANSWERS-A set of rules governing the exchange or
transmission of data between devices. (kinda like language between
devices)
Control Point - ANSWERS-variable in a control sustem
Commissioning - ANSWERS-the process of adjusting and verifying an
HVAC system to ensure it is operating as intended
VCD - ANSWERS-Volume Control Damper
Damper - ANSWERS-Controls flow
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PAGE
3
(MECHANICAL) EXAM
What evaporating medium do forced-air systems use? - ANSWERS-air
What are the components of a forced-air system? - ANSWERS-Air
conditioner, blower, supply and return ductwork, registers, grills, and
controls
What type of blowers are used in air conditioning systems? -
ANSWERS-centrifugal
Where are registers located? - ANSWERS-on the supply branches
Where are grills located? - ANSWERS-on the return air ductwork
When are hydronic systems commonly used? - ANSWERS-in a situation
where air conditioning equipment is located centrally and building
spaces are located remotely. Ex: school buildings
heat pump - ANSWERS-A mechanical device which uses compression
and decompression of gas to heat and/or cool a house.
END OF
PAGE
1
, COSC 325 HOUSTON LATEST
(MECHANICAL) EXAM
Reversing valve - ANSWERS-four-way directional valve that reverses
the flow of refrigerant through a heat pump. It consists of a piston and
cylinder that have four refrigerant line connections.
Auxiliary heat - ANSWERS-the extra heat provided by a conventional
heating system for periods of cloudiness or intense cold when a solar
heating system cannot provide enough
defrost cycle - ANSWERS-A cycle of operation of a heat pump that is
designed to defrost the outside coil during the heating operation
Building automation system - ANSWERS-control of the energy and
resource using devices in a building for optimization
DDC - ANSWERS-Direct Digital Control
Sensor - ANSWERS-A device that responds to a physical stimulus (as
heat, light, sound, pressure, magnetism, or a particular motion) and
transmits a resulting impulse (as for measurement or operating a
control).
END OF
PAGE
2
, COSC 325 HOUSTON LATEST
(MECHANICAL) EXAM
Controller - ANSWERS-a device that makes decisions to change some
aspect of a system based on sensor information and internal
programming
Actuator - ANSWERS-A device to produce physical movement based
on output from a computer system.
protocol - ANSWERS-A set of rules governing the exchange or
transmission of data between devices. (kinda like language between
devices)
Control Point - ANSWERS-variable in a control sustem
Commissioning - ANSWERS-the process of adjusting and verifying an
HVAC system to ensure it is operating as intended
VCD - ANSWERS-Volume Control Damper
Damper - ANSWERS-Controls flow
END OF
PAGE
3
