Tamu Cosc 325 exam 2 Houston Latest Update
2024-2025 Actual Exam 90 Questions and 100%
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Actuator - CORRECT ANSWER: device that accepts a control signal and causes a
mechanical motion. Motion may actuate the switch, rotate a valve system, change a
position, or cause some other change that affects one or more characteristics
Air cooled chillers - CORRECT ANSWER: · Taking heat out of the water and releasing it
to the air
· Lead and lag: having one chilling run while the other on is resting
Air Velocity - CORRECT ANSWER: speed at which air moves from one point to another
· Measured in feet per minute (fpm)
· 40 fpm is ideal
ASHRAE (American Society of Heating, Refrigerating, and Air-conditioning Engineers,
Inc.) - CORRECT ANSWER: · Recommends that ventilation be increased in all
residential, commercial, and industrial buildings
Auxiliary Heat - CORRECT ANSWER: is used during cold weather because a heat
pump that is sized for cooling a building in summer may not have a heat output that is
adequate for heating the building in winter
Axial flow blower - CORRECT ANSWER: a blower that contains a blower wheel, which
works like a turbine wheel
Boiler: - CORRECT ANSWER: pressure vessel that safely & efficiently transfers heat to
water
, · Pressure vessel: tank or container that operates at a greater that atmospheric
pressure
Branches - CORRECT ANSWER: extend from the trunks to each register
BTU - CORRECT ANSWER: British Thermal Unit is the amount of heat required to raise
1 lb of water 1 degrees F.
Building Automation System - CORRECT ANSWER: intelligent building that improves
occupant comfort and reduces energy use and maintenance
Centrifugal blower - CORRECT ANSWER: · consists of a scroll, blower wheel, shaft,
and inlet vanes
o Scroll is a sheet metal enclosure that surrounds the blower wheel
o Blower wheel is a sheet metal cylinder with curved vanes along its perimeter
Centrifugal Pump - CORRECT ANSWER: pump that has a rotating impeller inside a
cast iron or steel housing
Chiller - CORRECT ANSWER: component in a hydronic air conditioning system that
cools water, which cools the air
Commissioning - CORRECT ANSWER: process of balancing and adjusting a
mechanical or electrical system for maximum efficiency
Compressor - CORRECT ANSWER: mechanical device that compresses refrigerant or
other fluid
· Increases temperature/pressure of refrigerant vapor and produces the high pressure
side f the system
Condensate Return - CORRECT ANSWER: steam boiler accessory that collects
condensate return from heating units
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