HVAC Licensing Exam Study Guide in .NET

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HVAC Licensing Exam Study Guide
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Hot-water heating systems are classified as low, medium and ___________ temperature a boiling c sub-cool b d high near boiling
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Low-temperature water systems operate within the pressure and temperature limits of ASHRAE s Boiler Construction Code for low-temperature heating boilers That means that they have a maximum allowable pressure for such boilers of 160 pounds/inch2 and a maximum temperature of ___________ degrees F a 250 c 200 b d 100 75
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Low-temperature water systems are generally used for space heating in single homes, residential buildings, and most commercial and ___________ buildings such as office structures a college c manufacturing b d industrial hotel
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All hot-water systems require some type of ___________ to overcome friction losses of the flowing water a heating c suctioning b d cooling pumping
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Manufacturers of radiators and other terminal units provide data on ___________ losses through their equipment a high c friction b d low resistance
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Hot-water system piping must be sized to carry ___________ ___________ desired amount of heating water throughout the system a the minimum c the maximum b d the least the greater
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Infrared heating takes advantage of the fact that ___________ can be used to convey heat a wind c oil b d air light
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Heating Systems
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Infrared heaters offer the user total ___________ in heating a building a use c flexibility b d control energy
A person feels comfortable or uncomfortable based on the ___________ temperature, humidity, air flow, and degree of activity a surrounding c inside b d outside external
Infrared units may use either ___________ gas or propane a methane c ethanol b d natural high-pressure
To achieve total heating with infrared systems, calculate the normal heat loss of the building or room to be heated and supply an ___________ number of watts of infrared heat to replace what is being lost a established c equal b d estimated equivalent
Gas-fired infrared units have many of the same advantages as ___________ powered units a waterb windc electronicallyd electrically-
Infrared units should be mounted at as low a distance or height as possible The lowest recommended mounting height is ___________ feet to prevent too high a watt density on the upper part of one s body a 40 c 20 b d 30 10
Electrical heating systems are either centralized or ___________ a free-standing c open-ended b d closed-ended decentralized
A centralized system may be: a a heated-water system c a heat pump b d an electric boiler all of the above
HVAC Licensing Exam Study Guide
Radiant units may be: a quartz-tube elements with reflectors b quartz lamps with reflector c heat lamps d valance (cove) units e none of these f all of these
Unit heaters are available in three types; which of these is not one of them a cabinet heaters b horizontal projection heaters c vertical projection heaters d baseboard heaters
Heat pumps use electricity more ___________ than resistance heaters a effectively c economically b d efficiently effortlessly
Heat pumps come in four types Which of these is not one of them a air-to-air c water-to-water e air-to-metal b d air-to-water water-to-air
Electrically operated snow-melting equipment is available in three types Which of the following is not one of them a boiler heated-fluid type b embedded piping system c embedded electrical resistance-heating elements d radiative systems infrared lamps
Infrared snow-melting systems tend to be somewhat more expensive than embedded-cable or wire designs, in terms of both installed cost and ___________ cost a total c operating b d inspecting maintenance
Heating Systems
The ASHRAE Handbook recommends cabling rated at 6 to ___________ watts per linear foot for gutters and downspouts a 10 c 26 b d 16 36
A deeper burying of the snow-melting piping embedment will require proportionally ___________ heat because a greater mass of concrete is present a less c the same b d more about the same
A good rule of thumb to use in the placing of tubes of a snow-melting system is to space them ___________ inches center to center a 10 c 16 b d 12 24
In snow-melting equipment, piping mains should be covered with (a, an) ___________ blanket below the level of the slab a insulation c plastic b d coating metal
Finned tubes and convectors, typically mounted inside an enclosure, provide heat by ___________ currents passing over the fins a radiation c irradiation e none of these b d convection convention
Comfort heating with steam or hot water from boilers is known as: a steam heating c hydronic heating b d hot-water heating humidity heating
Residential baseboard elements generally consist of ___________ inch to 1-inch tubing in aluminum fins a 3/8 c 1/4 b d 3/4 1/2
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