There are no check valves or extra metering devices on most water-source packaged units because:
A) Water-source packaged units have a much lower operating temperature range than air-source units.
B) Most water-source packaged units use a single bi-flow thermostatic expansion valve.
C) Most water-source packaged units use suction line accumulators and charge compensators.
D) The heat exchangers are most often made of copper, cupronickel, or stainless steel.
B
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An electronic module digital input that is internally-pulled down would most likely be connected to which of the following?
A. A variable reluctance sensor B. A switch that when closed provides a positive voltage to the electronic module input terminal C. A switch that when closed provides a ground for the electronic module input terminal D. Battery positive terminal
The name that identifies and attribute in an attribute definition is called a(n):
a. attdef b. field c. tag d. attribute prompt
A pictorial diagram is also called a(n) ____ diagram.
A. ladder B. component C. architectural D. wiring
In Boolean algebra, 1 ? 0 = 0
Indicate whether the statement is true or false