The main cause of high condensing temperature and pressure in air-cooled condensers is:
A) Operating the condenser at low ambient temperatures without head pressure controls.
B) Refrigerant undercharge.
C) Dirty condensers.
D) Excessive airflow over the condenser.
C
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The concrete form accessory shown in the figure is a _____.
a. spacer
b. form tie
c. waler
d. spreader
Determine the measure of ?1 when ?2 = 82°0'.
Fill in the blank(s) with the appropriate word(s).
A __________ is defined by the NEC® as a complete lighting unit consisting of a lamp or lamps together with the parts designed to distribute the light, to position and protect the lamps and ballast, and to connect the lamps to the power supply.
a. fixture b. sconce c. luminaire d. lamp holder
Many members of which group(s) of soil microorganisms are anaerobic heterotrophs?
A) actinomycetes B) bacteria C) fungi D) both A and C E) all of the above