Why do communicating zone systems NOT use bypass dampers?
A) They can operate in free cooling mode without a bypass damper.
B) They do not have a zone ventilation mode.
C) They control airflow and system capacity based on the number of calling zones.
D) They do not use any high- or low-temperature limits.
C
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An 8 AWG copper conductor size would typically be used with a(n) ____.
a. thermostat b. lighting branch circuit c. electric furnace d. electric range
____ is an environmentally friendly product in all stages of its life span, from raw material production to demolition.
A. Concrete B. Steel C. Aluminum D. Bamboo
Cooling system leaks should be corrected because they may lead to electrical shorts and _______.
A. over heating of components B. corrosion of electrical connections C. loss of coolant D. All answers are correct
When the voltage applied to the emitter becomes about ____ volts more positive (higher) than the voltage applied to first base, the UJT turns on.
a. 5 b. 10 c. 15 d. 20