The limit switch is used on the electric element assembly to ____.
A. start the unit if the thermostat malfunctions
B. ensure that the fan stops when the unit cools down
C. start the unit prematurely on a cold day
D. open the circuit to the element if the furnace overheats
Answer: D
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An instrument with a system of ordered marks at fixed intervals used for measurement is called a:
a. Title block b. Scale c. Legend d. Digital terrain model (DTM)
More than one evaporator coil circuit is used when ____.
A. the evaporator is located outside the conditioned area B. there would be excessive refrigerant pressure drop in the coil circuit C. a distributor would not be practical D. a slant coil is at an angle more than 60°
What type of compressors are most commonly used in rooftop packaged units?
A) Semihermetic scroll or semihermetic rotary compressors B) Open-type centrifugal and open-type screw compressors C) Hermetic reciprocating or hermetic scroll compressors D) Hermetic rotary and hermetic centrifugal compressors
You should omit spaces when you assign a variable without using single or double quotation marks around its value.
Answer the following statement true (T) or false (F)