The condensate drain on a rooftop unit:
A) Does not require any type of drain line.
B) Is normally run through the curb to an inside drain connection.
C) Does not require a trap because of the short distance.
D) Must include a trap unless the unit has an integral trap.
D
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Copper or copper-clad electrodes can cause ____.
a. skin lesions to the system operators b. unexpected results at best c. electrolytic corrosion of the galvanized components d. significant 50 or 60 Hz artifacts arising from the power system's frequency
During the Middle Ages, the Chinese used ____________________ to control pests on crops
Fill in the blank(s) with correct word
All of the following are approved methods for diagnosing an ECT (engine coolant temperature) sensor EXCEPT ________
A) Observing resistance values at a specified temperature B) Substituting a variable resistor C) Digital multimeter (DMM) D) Scan tool
The ____ is a masonry or metal covering that may be placed over the flue for protection from the elements.
A. flue B. chimney hood C. chimney cap D. chimney liner