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25 Cards in this Set
- Front
- Back
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What is the name of the piping system in which the heating transfer units are part of the piping? A) Series loop B) One pipe C) Two pipe direct return D) Two pipe reverse return |
A) |
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What is the name of the piping system in which the heating transfer units are supplied by specialty tees? A) Series loop B) One pipe C) Two pipe direct return D) Two pipe reverse return |
B) |
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What is the name of the piping system in which the first heat transfer unit supplied is also the first returned? A) Series loop B) One pipe C) Two pipe direct return D) Two pipe reverse return |
C) |
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What is the name of the piping system in which water has approximately the same distance to travel for each heat transfer unit? A) Series loop B) One pipe C) Two pipe direct return D) Two pipe reverse return |
D) |
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What is a major disadvantage of the series loop system? A) Limited heating capacity for each circuit B) Equal length circuits C) Additional pipe and fittings required D) Unsuitable for residential applications |
A) |
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What is a major disadvantage of a one pipe system? A) End heat transfer units receive cooler water B) Heat transfer units cannot be individually controlled C) Equal length circuits D) Unsuitable for more than two heat transfer units |
B) |
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What is the major disadvantage of a two pipe direct return piping system? A) Requires specialty tees B) Limited To 75MBH C) Last heat transfer unit receives coldest water D) Hard to balance flow to each transfer unit |
D) |
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Which of the following valves is a good choice for an isolation valve? A) Needle valve B) Globe valve C) RPZ D) Ball valve |
D) |
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What is the purpose of a balancing valve? A) To prevent unequal supply and return piping B) To equalize supply and return temperature to the boiler C) To equalize pressure between the supply and return header D) To adjust flow rates to each unit |
D) |
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What is the purpose of a wild loop? A) It’s a fun ride at Six Flags B) To allow for expansion and contraction C) To maintain reverse pressure on discharge side of the circulator D) To prevent the pump from dead heading |
D) |
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What type of radiator valve should be installed to prevent unauthorized use? A) Thermostatic radiator valve B) Lockshield radiator valve C) Zone valve D) Ball valve |
B) |
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What is the purpose of a Zone valve? A) To isolate a particular room or area B) To balance flow between heat transfer units C) To provide control of heat emissions D) To control Thermostat output |
C) |
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What are Two primary things to consider when locating air removal devices ? A) Direction of flow and boiler location B) Ease of maintenance and installation C) Size and type of piping system D) Temperature and pressure |
D) |
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Why is it important to remove gases from a hot water heating system? A) To prevent convection from occurring B) To prevent over heating of the heat transfer units C) To prevent over pressuring of the system due to expansion D) To prevent air binding in the system |
D) |
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What device removes gases directly from the boiler? A) Expansion tank B) Cusion tank C) Manual air vent D) Boiler scoop |
D) |
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Where should you locate air vents ? A) At the suction and discharge side of the circulator B) At all heat transfer units C) At all high points in the system D) At convenient locations for servicing |
C) |
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What part of the circulator transfers energy to the water? A) Volute B) Diffuser C) Seals D) Impeller |
D) |
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What function does a circulator provide in a hot water heating system? A) Adds static pressure to the system B) Removes air from the system C) Moves water within the system D) Balances supply and return pressures |
C) |
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Where is the best location for the circulator? A) Upstream of the compression tank B) Downstream of the compression tank C) Upstream from the boiler return connection D) Downstream of the boiler supply connection |
B) |
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What is the purpose of a flow control valve? A) To control make up water to the boiler B) To prevent the pump from dead heading C) To prevent convection currents in a heating system D) To balance flow rates within the heating system |
C) |
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What is the purpose of a flow control valve? A) To control make up water to the boiler B) To prevent the pump from dead heading C) To prevent convection currents in a heating system D) To balance flow rates within the heating system |
C) |
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When you calculate heat loss through a concrete wall you use ? A) K value B) U value C) R value D) C value |
A) |
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When you calculate heat loss through a wall made of many materials you use? A) K value B) U value C) R value D) C value |
D) |
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When you calculate heat loss through a wall made of many materials you use? A) K value B) U value C) R value D) C value |
D) |
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1/R= ? A) K value B) U value C) R value D) C value |
B) |
