What is the purpose of the bypass damper used in many zone systems?
A) To bypass low- and high-temperature limits on the equipment when only one zone is calling
B) To allow outdoor air to bypass the equipment during free cooling
C) To recirculate air that is not being used by the active zones
D) To allow outdoor air to bypass the equipment during zone ventilation mode
C
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Compared to single-phase motors, three-phase motors are:
A) Stronger starting with a higher operating efficiency. B) More complicated and use more electricity. C) More common in small, fractional horsepower applications. D) More versatile because they can be operated on either single-phase or three-phase power.
A motor producing torque without the shaft turning, performs no work.
Answer the following statement true (T) or false (F)
when 1.5 mm(2/32in) is indicated on a tread depth gauge, the tire should be replaced
a. true b. false
El tamaño de la tubería eléctrica de conexión a tierra de equipo (EGC) se determina mediante:
a. el tamaño de los dispositivos de protección contra sobretensión. b. la longitud de la tubería eléctrica. c. el tamaño del neutro. d. el tamaño del conductor más grande