Tamu Cosc 325 exam 2 Houston Latest Update

Tamu Cosc 325 exam 2 Houston Latest Update

• 90 Questions and 100%

Verified Correct Answers Guaranteed A+ Approved by the Professor

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 1 / 2

· 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

• 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

• Scroll is a sheet metal enclosure that surrounds the blower wheel
• 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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