How is the optimal configuration for an air-source unit determined?
A) by selecting a heat pump that meets the building's heat loss
B) by considering the method of discharge
C) by installing a unit that has the lowest installed cost
D) by matching the type of unit with the type of building construction
D
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Answer the following statement(s) true (T) or false (F)
1. Motors and generators are look-alikes with their armature, field poles, commutators, and such, and where they differ is in the opposite application of electromagnetism. 2. The generated emf is a measure of the useful mechanical energy obtained from the neutrons passing through the armature. 3. Wave windings require only four parallel paths through the armature in one complete wave winding, regardless of the number of brushes. 4. To counteract the warping of the magnetic field, large AC motors are often built with interpoles, or commutating poles. 5. When the torque increases to meet the new load demand, the speed will readjust itself; thus, the motor maintains a fairly constant speed.
Resistors are commonly used to perform two functions in a circuit: to limit the flow of current through the circuit and ____.
a. to produce a voltage divider b. to separate points in a circuit c. to produce a watt divider d. to separate field effects
What is an advantage of a cross flow tower?
A) Cross flow cooling towers have variable pitch air inlet vanes to provide more efficient airflow through the tower B) A cross flow tower can be configured for a lower height C) The discharge air can be ducted into conditioned space in the winter to provide free heat and humidification D) crossflow cooling towers can employ ECM blower motors
What can be done to prevent ductwork from sweating?
A. Lower the thermostat setting. B. Add dampers. C. Insulate the duct. D. Both a and c are correct.