COSC 325 Houston (Mechanical) (Latest
Update ) Questions & Answers
{Grade A} 100% Correct
Power hot water (high temp) boiler - correct answer bigger than 160 psi and 250
degrees F
Low-Pressure Steam Boiler - correct answer not to exceed 15psi of steam
Power steam boiler - correct answer bigger than 15psi, used when steam is utilized for
purposes other than solely heating
Main Steam Stop Valve - correct answer Valve or valves found on the main steam line
leaving the boiler. Used to place the boiler on line or take it off line
,steam header - correct answer distribution pipe that supplies steam to branch lines
steam trap - correct answer steam boiler accessory that removes air and condensate
from steam lines and heating units
Centrifugal pump - correct answer Used mainly on hydronic systems. has a rotating
impeller inside a cast iron or steel housing.
Expansion tank - correct answer A chamber or tank provided in a hot water heating
system to allow for expansion of the water in the system as its temperature rises.
Pressure-reducing valve - correct answer automatic device used to convert high or
fluctuating inlet water pressure to lower or constant pressure
, flow control valve - correct answer A device that controls the flow (gpm) of water in a
hydronic system
Terminal device - correct answer The end point, where the air dumps into the room.
(surface radiation, standing radiator, radiant panel)
programmable thermostat - correct answer stand alone thermostat that can be
programmed by building occupants
Refrigeration - correct answer process of moving from an area that is undesirable
Compressor - correct answer mechanical device that compresses refrigerant or other
fluid
refrigerant R-22 - correct answer older refrigerant "freon"
Update ) Questions & Answers
{Grade A} 100% Correct
Power hot water (high temp) boiler - correct answer bigger than 160 psi and 250
degrees F
Low-Pressure Steam Boiler - correct answer not to exceed 15psi of steam
Power steam boiler - correct answer bigger than 15psi, used when steam is utilized for
purposes other than solely heating
Main Steam Stop Valve - correct answer Valve or valves found on the main steam line
leaving the boiler. Used to place the boiler on line or take it off line
,steam header - correct answer distribution pipe that supplies steam to branch lines
steam trap - correct answer steam boiler accessory that removes air and condensate
from steam lines and heating units
Centrifugal pump - correct answer Used mainly on hydronic systems. has a rotating
impeller inside a cast iron or steel housing.
Expansion tank - correct answer A chamber or tank provided in a hot water heating
system to allow for expansion of the water in the system as its temperature rises.
Pressure-reducing valve - correct answer automatic device used to convert high or
fluctuating inlet water pressure to lower or constant pressure
, flow control valve - correct answer A device that controls the flow (gpm) of water in a
hydronic system
Terminal device - correct answer The end point, where the air dumps into the room.
(surface radiation, standing radiator, radiant panel)
programmable thermostat - correct answer stand alone thermostat that can be
programmed by building occupants
Refrigeration - correct answer process of moving from an area that is undesirable
Compressor - correct answer mechanical device that compresses refrigerant or other
fluid
refrigerant R-22 - correct answer older refrigerant "freon"
