COSC 325 HOUSTON MECHANICAL EXAM ACTUAL

COSC 325 HOUSTON (MECHANICAL) EXAM ACTUAL /

QUESTIONS AND VERIFIED ANSWERS

steam heating system - ---Answers----heating system that uses steam to carry heat from the point of generation to the point of use

hydronic system - ---Answers----uses water or other fluid to carry heat from point of generation to point of use

boiler - ---Answers----central element of a steam or hydronic system. a pressure vessel that safely and efficiently transfers heat to water

Low Pressure Hot Water Heating Boiler - ---Answers----does not exceed 160 psi and 250 degrees F

hot water supply boiler - ---Answers----bigger than 120 gal, heat input greater than 200000 Btu/hr., operating temp higher than 200 degree F

Power hot water (high temp) boiler - ---Answers----bigger than 160 psi and 250 degrees F

Low-Pressure Steam Boiler - ---Answers----not to exceed 15psi of steam

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Power steam boiler - ---Answers----bigger than 15psi, used when steam is utilized for purposes other than solely heating

Main Steam Stop Valve - ---Answers----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 - ---Answers----distribution pipe that supplies steam to branch lines

steam trap - ---Answers----steam boiler accessory that removes air and condensate from steam lines and heating units

Centrifugal pump - ---Answers----Used mainly on hydronic systems. has a rotating impeller inside a cast iron or steel housing.

Expansion tank - ---Answers----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 - ---Answers----automatic device used to convert high or fluctuating inlet water pressure to lower or constant pressure

flow control valve - ---Answers----A device that controls the flow (gpm) of water in a hydronic system

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