COSC 325 Houston (Mechanical) Latest Update 2024-2025 Actual Exam 100 Questions and 100% Verified Correct Answers Guaranteed A+ Approved by the Professor
5 requirements for comfort - CORRECT ANSWER: proper temperature, humidity,
circulation, filtration, ventilation
Actuator - CORRECT ANSWER: A device to produce physical movement based on
output from a computer system.
Air velocity - CORRECT ANSWER: the speed at which air moves from one point to
another
Are VAV systems DX (refrigerant) or Chilled water? - CORRECT ANSWER: Both.
ASHRAE - CORRECT ANSWER: American Society of Heating, Refrigerating and Air-
Conditioning Engineers
Auxiliary heat - CORRECT ANSWER: the extra heat provided by a conventional heating system for periods of cloudiness or intense cold when a solar heating system cannot provide enough
axial flow blower - CORRECT ANSWER: -Consists of a blower wheel that works like
turbine wheel -Used in medium to high pressure forced air heating systems
Blower - CORRECT ANSWER: pump-like mechanism which generates airflow
blowers used in forced-air systems - CORRECT ANSWER: propeller, centrifugal, axial 1 / 2
boiler - CORRECT ANSWER: central element of a steam or hydronic system. a
pressure vessel that safely and efficiently transfers heat to water
Building automation system - CORRECT ANSWER: control of the energy and resource
using devices in a building for optimization
centrifugal blower - CORRECT ANSWER: Consists of a scroll, blower wheel, shaft, and inlet vanes
Centrifugal pump - CORRECT ANSWER: Used mainly on hydronic systems. has a
rotating impeller inside a cast iron or steel housing.
Chiller - CORRECT ANSWER: A device that removes heat from a liquid, typically as part of a refrigeration system used to cool and dehumidify buildings. The system; it has the evaporator and condensor. Used in Hydronic
Commissioning - CORRECT ANSWER: the process of adjusting and verifying an HVAC
system to ensure it is operating as intended
Compressor - CORRECT ANSWER: mechanical device that compresses refrigerant or
other fluid
Control Point - CORRECT ANSWER: variable in a control sustem
Controller - CORRECT ANSWER: a device that makes decisions to change some
aspect of a system based on sensor information and internal programming
Cooling tower - CORRECT ANSWER: evaporative heat exchanger that removes heat
from water
Damper - CORRECT ANSWER: Controls flow
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