Refrigeration refers to space temperatures:
A) Below 0°F. B) Below 32°F. C) Below 40°F. D) Below 60°F.
D
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Which of the following RLL applications is not normally performed in early automation systems?
A) Proportional control of field devices B) Logical control of discrete devices C) On/off control of field devices D) On/off control of motor starters
Like many multisplit units, variable refrigerant flow (VRF) systems use ________ compressors and electronic expansion valves to change the volume of refrigerant being circulated in the system
A) reciprocating B) scroll C) inverter driven D) screw
Refrigerant analyzers or identifiers are being discussed. Technician A says if the analyzer displays "R-134a," then the refrigerant is 98 percent pure. Technician B says if "HC" is displayed, then the refrigerant is flammable. Who is correct?
A. Technician A only B. Technician B only C. Both A and B D. Neither A nor B
Larger fan coil units are most commonly used to condition
A) Hotel and motel rooms B) Schools C) Factories D) Offices and stores where common air distribution is feasible